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Testimonials - Tunit Petrol & Diesel Performance
(506) 2831371 | INFO@TUNIT-LA.COM
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Read how numerous satisfied customers describe their vehicles after fitting their Tunit. Every comment below is from one of our thousands of satisfied customers, both here in the UK and overseas.

Enter your vehicle manufacturer below:


Alfa Romeo

R. Robson from London,
Alfa Romeo, GT 1.9 JTD
June 2007

The tunit box is fantastic, there now seems to be loads more power throughout the rev range and the noticeable turbo lag that was there before has all but gone. Also the average fuel consumption has improved by about 3-4 mpg! It's also good how easy the box is to remove if need be, 10 minute job. It really has increased my enjoyment of the car, I really can't fault it, worth every penny.


Roger Binks from St. Albans,
Audi, A4 2.0 TDI 170bhp
October 2008

Needed more mpg and grunt! Ordered tunit, fitted it, smiled!

Ronnie Horakova from Aberdeenshire,
Audi, A6 2.0 TDI 140bhp
February 2010

My car is going like a train!!!!!!!! I think i'm getting about 10 extra mpg,measured on a nice flat straight road.That alone is worth the money. (I'm trying to convince my dad and sister to get one now! Think mum is the main problem here!)</p><p>


Ronnie Bain from Aberdeenshire ,
Audi, A4 3.0 V6 TDi
October 2012

Hello Dan,
Thanks for your reply,got your instructions in the box actually,dad never mentioned they were in there, therefore managed it no problem,installed in 10 mins- no battery power this time,so saved a job. Done a test drive and was amazing difference,infact i had to brake that hard from around 100 mph,my bl**dy pad wear light is now on! Your costing me a fortune Dan!

So on that note.. ive whacked it up to number seven,s*d the expense.

M. Bland from Newcastle?Upon-Tyne,
Audi, A4 1.9 TDI-PD
September 2007

Thanks for all your help on Monday, I didn?t appreciate the difference in my car until yesterday. Getting into it after not driving for 24 hours was a revelation. Cold starting did not produce the usual black smoke, there was no hesitation when moving off form standstill and the throttle response was much quicker with VERY smooth acceleration. So smooth that my wife commented on it. The improvement to torque at low revs means that the car will trickle along in 3rd gear without throttle, even up a slight incline! All in all Tunit is worth every penny.

Ralph Grinter from Pontypridd,
Audi, A4 2.0 TDI 170bhp
October 2008

hi mike,just a short note about my tunit ,performance is a lot better now that the car is run in. with economy slightly improved. very impressed with unit many thanks ralph

Allen Beechey from N.Devon,
Audi , A6 All Road
May 2011

Never thought this engine would be smoother than it already was.power has increased and gained 5 more miles per gallon.setting 5.cant praise tunit does exactly was it says on the tin.this is a 2.5 tdi audi allroad,i will most certainly be recommending your product to my motoring friends.thank you once again.Mr F Sanders Ltd who installed the device was excellant in his customer care...Mr A BEECHEY...

Alan Preston from Bolton,
Audi, A4 2.0 TDI
October 2008

This is my 3rd Tunit and I would not run a tdi without one. The current tunit has improved the torque tremendously making it far easier to drive due to less gear changes. The throttle response is instant without any turbo lag and I would recommend a Tunit to friends and family.

Jeff Emmett from Oxfordshire,
Audi, Allroad 3.0 TDi
March 2010

"Try before you buy" is a very fair and effective way to market your product as there are so many similar kits offered on the market and no other gives you this option.
Your appointed Dealer, Humphris of Oxford gave excellent service and your product has tranformed the performance of this car - it has brought it alive!
Thank you

Jonathon Pitt from Chorley,
Audi, A5
November 2016

Just wanted to add the NEW Optimum PLUS with Smart Phone control is an amazing bit of kit, less than 24 hours into using the upgrade but its brilliant, thanks again Michael and everyone at Tunit.

Alan Preston from Bolton,
Audi, A6 3.0 TDi

This is my fourth Audi TDi and my first A6. I opted for the 3.0Tdi Quattro SE Avant as it rides a little higher than the S-Line which helps when towing my caravan. When reading reviews the A6 was criticised for a firm ride so I had the adaptive air suspension fitted and it is superb, in comfort mode it floats along and gives a superb ride, however for a sporty ride just set it to dynamic. This is my first automatic and the tiptronic is a dream to use with apparently seamless shifting, you can over ride it at anytime with the shift paddles giving you total control. I had my 3 previous TDi's superchipped but this time I have gone for the Tunit unit which I had fitted at Tunit Chorley along with a K+N Filter. If you sell the car you can take it off in minutes and Tunit will give you a part ex allowance if it is not compatible with your new car. It now punches out 275 bhp and the power delivery is smooth and instant.

Rod Hill from Inverness,
Audi, A6 1.9 TDI
October 2008

A fantastic product. As a taxi owner it saves me on fuel but also makes the car easier to drive with less gear changing because of the extra torque

Graham Hayes from Wellingborough,
Audi, Q7 3.0 TDI V6
November 2011

The Tunit fitted and working well. Additional power great but now getting 33 mpg versus the 25 mpg that I was getting.

I originally left the setting at the default 5 and was getting about 29mpg, I thought by moving to 7, I would have increased power but reduced mpg, however the opposite has happened.

I fitted the unit myself in the end, it was very simple to do.

Niel Murphy from Preston,
Audi, A3 TDI
October 2008

From knowing little about diesel tuning I knew my car was more capable, a friend recommended tunit. One phone call convinced me it is a quality product, I collected my box the same afternoon were I was taken through the product install and even shown were to locate the box on my car. The service was fantastic and even before fitting the tunit box I left with a smile and now an even bigger one with the difference it has made to my car!! thanks

Martyn Walley from Newcastle-Under-Lyme,
Audi, Q5 2.0TDi DPF
August 2010

I was quite sceptical about investing in a Tunit unit, however having now fitted one I wish I had bought one for my last vehicle now having witnessed the difference. I am still trying to get my head around the amount of increased performance and fuel consumption, logic says increased performance reduces fuel efficiency, not in this case it?s simply amazing. I used to average around 36-37 MPG, since fitting the Tunit V-CR I now get 46-47 MPG, and towing well, that?s another amazing change, previous returns of 22-24 MPG where as now I am getting 31-33 MPG, but you really benifit here with the increase torque, outstanding and thank you!

Jonathan Pitt from ,
Audi, A7 3.0 V6
August 2017

despite only driving it for a couple of days that initial lag has disappeared


Robert Slowey from Leamlara, County Cork, Ireland,
BMW, 320D
October 2008

Excellent customer service with knowledgable staff.

Paul from Italy ,
BMW, 520d 163BHP
march 2011

Still can?t get over how fast you got the TUNIT here to Italy!
Shipped and fitted within 24 hours.. fantastic... oh and I?m now keeping up with boys in their 530d?s on the Autostrade!

Laurie Hockley from Horsham,
BMW, 320D Touring
July 2010

My 2004 BMW 320d with over 70000 miles on the clock recently gave me over 700 miles from a single tankful of fuel. And I wasn't driving slowly!

David Willis from West Yorkshire,
BMW, 118d
November 2004

Just thought I'd drop you a mail to say how things are going with the car. So far, no problems whatsoever; well, not true actually - if I continue driving it the way I have been, I'll loose my license!

Power delivery is very smooth, and it definitely revs longer - in fact, it's much more like a petrol engine at the top end. comparitively, on a twisty road, I think I could keep up with my Boxster S - would be left on the straights, but through the bends... all that torque wins ! And the car is superbly balanced.

Fuel consumption has dropped to 42mpg, but I've only been doing short journeys, so can't really comment upon that being the true average.

Once again, thanks for your hospitality on my visit to Chorley - it was good to see what really goes on in the tuning world!

Look forward to reading Victors article.

Howard Bland from Ratby, Leicestershire,
BMW, 320dse touring
October 2008

Improved economy especially when towing a caravan above 50 mpg have also improved torque.

Adrain Cawsey from Dover,
BMW, 320d
February 2010

The tunit was fitted and we gave it a road test, thank god we got full M Sport suspension, the roll on torque was awesome, acceleration in 3rd and 4th was like being on a bike. This was on the setting it came with, I will up it soon to try it, I guess somewhere around 5bhp a click? Anyway, your little box has to be the best kept secret out there. I'll call when the weather gets better to get it on a laptop.</p><p>

Les from ,
BMW, 330d
November 2016

Still saving and performing well

Phil Smith from North Yorkshire,
BMW, 530d
June 2007

Just a quick note to say...

Tunit fitted easily & quickly, gives a truly noticeable & impressive performance increase...worth every penny. Your help & advice was also excellent. Many thanks.

William Rowe from Irvine, Ayrshire,
BMW, 320d
October 2008

Although the amount that I spend is roughly the same, the amount that I use is less. The ave. fuel consumption has increased by approx 5mpg on average. The engine however is noticeably quieter and more responsive. Personally, I would not consider having a diesel and not fitting a tunit ! Thanks, Willie

Sixto Sune from Portugal,
BMW, X5 3.0d
October 2008

Great product. Easy to install. Works very well. Frees factory-limited engine.

Chris H from Guildford,
BMW, X1 xDrive20d
June 2016

I can comfortably do 50mph in 6th now where it struggled before, and revs are much quicker to get moving. It's still a big lump as you say;) but feels a lot more sprightly

Mark Williams from ,
BMW, 120i M sport
March 2018

What a cracking piece of kit … Loving the sport mode

Steve Milne from County Durham,
BMW, 318D 2.0
February 2009

Just had the Tunit V-CR fitted to my 2008 BMW 318 Diesel. Have to say that service and after-care from the company is excellent. Dealer fitted it in 10 mins, took me through de-installation etc and even knocked £20 off the bill. My car is now a 320DSE- torque, economy and smooth engine pull have all improved. Icing on the cake is a 3 year warranty, removability between cars and a PART-EX facility. Superb-buy this product!!!

Julian Bailey-Watts from Chippenham,
BMW, X5 3.0d
October 2008

An excellent bit of kit, fit and forget, does what is says on the box!

Chris from Surrey,
BMW, 120d

I've got the tunit turned up as high as possible as my car is always packed with heavy gear and still performs well. Seems progressively smoother and doesn't have such a bad dead spot at high revs. I shall probably go through tyres more quickly but it's rejuvenated my love of the car and on average the consumption is still better than before but exact figures I'm not sure of.

Stuart from ,
BMW, 520d
November 2016

I am very pleased with the outcome of tuning my new car. I have had the unit installed for a couple of months now and have seen a real performance increase as well as miles per gallon when driven economically. Would highly recommend Tunit.

P Hunt from Southport,
BMW, 330d
June 14th 2004

I called in last week and decided to go-ahead with yourselves fitting the unit to my BMW 330D. After a short while (approx 30 mins), my car was fitted with the unit and ready to go. I could not believe the instant response as soon as I accelerated, as, with most diesels, the turbo lag was obvious before fitting of the my amazement, this turbo-lag has been completely eliminated, giving my car instant acceleration. This was my main objective with this already powerful car, and after driving back home, I was totally convinced of the improvement both in economy and power. It feels as though I have had a completely new more powerful engine fitted, as the power range through the gearbox (auto) is smoother and about 30-40% quicker!!! To make matters even more immpressive, I have noticed approx. 12 mpg gain. This is a true reading on my on-board-computer, and I have now worked out that it will take me about 6-7 months of driving to "get-my-money-back" on this faultless unit! What more can I say. Absolutely thrilled with the product and I would recommend it to everyone

Dave Butcher from Waterlooville,
BMW, Alpina D3
October 2008

After Installation the D3 vastly improved in performance reving like a petrol engine and the extra torque made it pull much harder through the gears.Also it improved the mpg by 4 which is outstanding.Highly reccomended Thanks Dave

Robert Coles from Bridgend,
BMW, 320D
October 2008

Believe it to be excellent product trouble free and easy to fit

Darren Broadhurst from Cornwall,
BMW, Z4 3.0i
May 2017

Fantastic company to deal with. Tunit gives the vehicle more drivability and low down torque great for either towing or carrying heavy cargo. Inturn you get better mpg due to staying in top gear over longer periods. Used them for years wouldn't go anywhere else.

Paul Douglas from Suffolk,
BMW, 335d
February 2009

Hi Dan.</p>
<p>Thank you for the chat on Friday. Transferred the unit to my new 335d. Using setting 6 the effect was immediate and obvious. Previous slight "hesitation" when pulling away now gone completely, car is much more responsive, the auto box seems to use lower revs, car is quieter and smoother, economy improved etc. Quite how the same unit can perform so well on 2 different cars is a mystery to me (though perhaps not to you guys!) but it does and I am again, deeply impressed with the product. A brilliant car just got a whole lot better.


Darren Weatherall from Sheffield,
Citroën, Picasso 1.6 HDi
August 2009

Hi Dan,</p>

<p>Seven months down the road and all is good with the Tunit V-CR on my Citroen Xsara Picasso.  I have been meaning to email since having it fitted but days have turned into weeks and weeks into months!  I wanted to tell you that both Andy and John are a credit to your team.  Not only did they fit the Tunit for me (you weren't wrong about the plug not being in the most accessible place!) and optimise the settings, they also give me a cupa and a biscuit :-)</p>

<p>As for the Tunit, if I hadn't seen Andy fit it I would have thought something else had been done to the vehicle!  I wasn't really sure what to expect however the difference was immediately noticeable during the test drive and even more so after I started to play a little more.  I know the Picasso is only a family vehicle however the Tunit V-CR has made this a great deal more fun to drive :-))</p>

<p>I would also like to report that I have been getting good results with the fuel economy ranging from 2-9mpg more than before fitting it.  Obviously this has varied based on the journeys and the setting being used on the Tunit.  </p>

<p>Thanks again,

Paul Eslick from Manchester,
Citroën, C4
October 2008

Had my tunit fitted same day I bought my new C4 especially noticed the increase in performance. Fuel economy can exceed 60mpg on a long run against mid 40s.

Finbarr O'Mahony from Douglas, Cork, Ireland,
Citroën, C5 1.6HDi
October 2008

Engine runs more smoothly, pulls really well

Lee Henrys from Warrington,
Citroën, C5 2.0 HDi
June 2008

Hi Daniel, since the fitment of the Tunit V-CR unit to my new Citroen C5 I have noticed a marked increase in fuel economy, performance and refinement. At a steady motorway cruise the average consumption has improved from 40mpg to in excess of 50mpg. Performance has also increased and the added midrange torque makes overtaking swifter and safer. I am delighted with the result, especially as I fitted the Tunnit to enhance performance rather than economy.

The added benefit of being able to transfer the tunit to another vehicle in the future is the icing on the cake.


Robert Leggett from Grantham,
May 2010

I only do small mileage most of the time but it does save money


Mike Noble from Couty Wicklow,
Dodge, Nitro 2.8 CRD
June 2008

Thanks very much got it fitted easily once you had shown me where to plug it.

Just done a short school run and WOW was never going to be a fast car due to its power to weight ratio it was woefully underpowered.. It is a big american lump of iron after all.

However have wacked the tunit up to 9 and what a difference, it now drives just so much better, I no longer have to floor the throttle to get a response from the automatic box/engine. It is now truely my dream (family 4x4) car.. It now goes as well as it looks.

What a truely amazing piece of kit; every diesel engine should have a Tunit !

Thanks again for the phone calls, emails and humouring me.


Terry Hector from Axminster,
Fiat, Ducato 2.8 JTD
October 2008

I use Tunit in my 4.5 tonne Motorhome - It improves overall performance without using more fuel - I am very happy with it

Ian James from Lydbrook,
Fiat, Punto 1.3 JTD
October 2008

Tunit very good on both cars SRI very good performance. Fiat lot of power for engine size and 64 gallon average over 6K miles

Mike Salmon from Warrington,
Fiat, 500 1.3
November 2008

First impressions with the 500 with the Tunit fitted are without doubt quite sensational. The engine is very free revving with a fantastic spread of torque right through to 4000rpm. When driven quickly you fly though the gearbox making the car a whole lot of fun. Its not just the top end of the rev range to benefit either, at 30mph put it in fifth and the 500 purrs along quite happily without any hesitation. Put your foot hard down from this speed and I would have expected an amount of judder and not much engine pick up, but no she pulls away a little slow at first but cleanly never the less.

The engine is definitely more smoother and flexible you would definitely question the cars 1.3 litres if you didnt know for something of larger capacity. A little early to comment on fuel consumption yet but first impressions are for an improvement.

My wife Lynne comments are that she has been razzing (women talk for driving briskly) with the car being so much more responsive and fun to drive, along with this has stated the on board computer showing an increase of some 2mpg even with the more enthusiastic driving. She has also said it feels a lot smoother.

Generally very pleased the tunit it has had a big impact on the little 500. We will let you know a bit more after a bit more running.


Mel Glentworth from Burton on Trent ,
Ford , Mondeo
August 2011

I see no reason to use any setting other than 9, don't have to use the extra power. Right foot mostly under control: but hell, it shocked my passengers, and I suspect others, when I needed to use it!

Dave Wood from Cumnock,
Ford, S-Max 2.2
May 2010

Nice increase in torque, car more urgent when pressed.

Julian Grimmal from Adlington, Lancashire,
Ford, Transit
November 2008

I had the Tunit installed to my Transit 90 hp just 10 days ago because the fuel economy was so bad ! To say I am pleased now is a big understatement. Before I got around 360 miles per tank before and now I am getting 410 per tank. The fuel economy was expected but the extra power took me aback. I actually like driving this nearly as much as my Q7 now which is booked in next week to have the same ! Thanks

Stephen Staples from Luton,
Ford, Focus 1.8 TDCi
October 2008

Since fitting the tunit product I noticed smoother response from the engine even though the car was only 6 months old and obviously more power. Power difference showed more on the motorway when overtaking as plenty of power on tap without gear changes. Fuel consumption is good averaging just under 50mpg if i drive softly enough. Very pleased with the product.

Gordon Glen from Glasgow,
Ford, Focus 1.8 TDCi
October 2008

Best advantage is the car had a flat spot when accelarating away this has been eliminated and vehicle has far more power for overtaking without even having to drop gears.

Robert Machin from ,
Ford, C Max
August 2017

I was very sceptical about the results shown on the Tunit website relating to the improvements showing for my 1.6 litre Ford C Max diesel but after taking the plunge and buying one, my sceptisisim was blown away. Not only did the fuel economy improve by around 15% but this coupled with the greatly increased power output has turned my C Max into a totally different vehicle. I am now an advocate of this product and talk about its benefits to anyone I know who is interested in improving their vehicles parameters along with the added benefit of reducing their emmisions and hence improving the environment.

Robert Beeton from ,
Ford, Focus TDCi 115
11th March 2004

Ive recently added a tunit V-CR to my Focus TDCI 115 and the results are truly satisfying. With the jumper set to the higest power setting my focus (already well run in) managed 148bhp (121 before) at 3800rpm and 223lb.ft of torque (190 before) at 2200 rpm on a dyno. 0 - 60 has been measured in the dry at 8.3 secs (2 secs quicker than standard) thanks to 7% ish longer gearing courtesy of 17.5" rims, taking 3 gears to do so.

Pulls impressively well from 1250 rpm, especially noticable in 4th and 5th gears.

Ive backed the jumper off two settings and made do with slightly less power for now and fuel economy really is significantly higher thanks to the substantially stronger high gear pull. I was previously averaging 45mpg over a tank, mostly urban runs of 12 miles or less but including weekly motorway runs of 120 miles.

Motorway cruising is easier and smoother (I do not know why) And at 75 mph on good road a truly ridiculous figure of 69.0 mpg showed on my trip computer after 60 miles.

A few tanks of fuel later, and without paying too much attention to what my right foot is doing the car easily does 500+ miles on about 48 litres of diesel at about 52 mpg in mixed driving conditions, 7 mpg more than pre-tunit and 2.5 mpg more than ford say the focus on big hoops will do.

Rob Waterfall from Gillingham, Dorset,
Ford, Mondeo TDCI
October 2008

The Mondeo TDCi has definitely inceased in power throughout the lower gears in particular (and torque has gone up).

Nigel Williams from SHERBORNE,
Ford , Focus 1.6TDCi 110BHP
January 2012

Hi Dan,
Thank you for your help regarding my Focus. I managed it in the end and rang John at Wincanton to thank him and explain.
The Tunit is excellent; 65.5 mpg over 55 miles to Bristol at normal speeds and 63.5 mpg at normal speeds on the motorway to London the following day. Overall this is 8-10% better than before. Brilliant!

B Starrow from Hexham,
Ford, Ranger TD
January 2007

Just a line to enclose with the product registration form to let you know that Simon at West Auckland fitted the tunit and we are very pleased with it.

The pick-up is on top of its work all the time and running very smoothly - it has pulled the livestock trailer to market several times.

James Burns from Glasgow,
Ford, Mondeo 2.2 TDCi
October 2008

Easy to fit and a great benefit on fuel consumtion and performance

Peter Jones from Cardigan,
Ford, Maverick 2.7 TDI
July 2009

Hi Andy,</p>
<p>So here's a big thankyou, it's been on for two days and I can't stop smiling. Just did a few 0-60 times and averaged 12.3secs.</p>
<p>The standard on a new car is 15.7, have that, cheers.
Top job, well recomended.

Andrew Mansell from Gwent,
Ford, Ranger 2.5 TD
February 2010

It is remarkable how much of a power boost the tunit gave my vehicle, when towing it is a delight I don’t know the van is there. I very rarely need to change gear. I have and will continue to recommend Tunit to anyone and everyone I speak to when the opportunity arises. Well impressed with aftersales on every call the service has been excellent. All queries dealt with politely. Staff are very knowledgeable

Gareth Davies from Montrose, Angus,
Ford, Fiesta 1.4 TDCi
October 2008

The tunit has increased the power and fuel consumption of my Fiesta by at least 10%. I used to get 58 mpg and have recorded 65 mpg when drivng steady for a whole tank. This was done on dual-carriageways into work.

David Mellor from Sunderland,
Ford, Mondeo TDCI ST
October 2008

Took it off the Jag & put it on to a 2006 Mondeo TDCi ST, fitted with a K&N Induction kit, on a trip to Manchester at no more than 70 mph on cruise control it returned 62 mpg!!, this was with the A/C on & 3 x passengers in the car, the car is smoother, and the pick-up is just awsome, my tunit was the 1st one fitted to a Jaguar diesel in the UK, and was set up on the rolling road at Chorley by Neil Bromley, It would be nice to find out what the ST is puting out in BHP, very happy with the TUNIT & the back up both from Chorley & the local agent in Newcastle

nigel Williams from Bristol ,
Ford , Focus 1.6TDCi 110BHP
January 2012

Hi Dan,
Thank you for your help regarding my Focus. I managed it in the end and rang John at Wincanton to thank him and explain.
The Tunit is excellent; 65.5 mpg over 55 miles to Bristol at normal speeds and 63.5 mpg at normal speeds on the motorway to London the following day. Overall this is 8-10% better than before. Brilliant!
Best wishes,

Stephen Fenn from Essex,
Ford, Mondeo TDCi 130 auto
August 28th 2006

I recently purchased a TUNIT for my Mondeo 130bhp Automatic
station wagon. I noticed an improvement in performance, smoothness and
fuel consumption immediately after fitting but it was not until I did
the round trip to UK last week that I really saw the difference. I drove
3500Km in seven days my average consumption was 6.5l per 100 km,
previous trips gave 7.2l per 100 km an improvement of 9.7%. The extra
power available was particularly noticeable when climbing the quite
steep hills on the French Auto route resulting in a much more relaxed
journey. I would like to congratulate you on a very good product.

Mark King from Loughton, Essex,
Ford, Mondeo 2.0 TDCi
October 2008

Not only the fuel saving but the car is smoother to drive and has more power through all the gear range.


Mark Sullivan from Leyburn,
Hino, 700 FS
22nd November 2007

You are now my bestest pal in the whole world...and all that!

After me ordering the box on the phone from you, it came well inside 24 hours and I fitted it myself after my first load at 06.00 in the dark, which is why it took about 3 minutes including tilting the cab!

I have used it for one day on factory setting 5 to get used to the extra grunt the truck now has and will turn it up bit by bit. It is very noticeable that it has more power now because I can skip 3-4 gears when fully loaded changing up which is very strange (but I can get used to it!).

Ill give it a go for a while playing with it and let you know by phone or computer message how I get on.

Again thanks mate I think for the money it cost Im glad I didnt go for the re-map.


Update - Received 24th February 2009:

Hey Dan,

Just clearing some stuff from my e-mails and found this.

My truck has now done 330,000kms plus with the tunit box and is
still on max power from the day I got it!! (I was told 535bhp).

The engine uses no oil from service to service.

How much does a 480 bhp Volvo cost? because a lad in a TARMAC 8x4 had
a go with me last year and could not run with me from 40mph up until the speed limiters.

Thanks lads I am still happy with my box. (driving like a **** does save fuel with the box though).

All the best



D Towers from Hereford ,
Honda , Accord 2.2 I-DTEC
August 2011

You gave me the name of Aldon Automotive as a Company who could carry out a Rolling Road Test a few weeks ago. I contacted them and visited on the 12th July. They carried out the test and made a few small adjustments to the Tunit box and the car is now running extremely well. I have now covered about 800 miles and the performance available is certainly improved along with the general driveability. The economy has also improved and currently stands at about 46 to 47 mpg over mixed driving. The previous figure was about 42 to 43.

The purpose of my email is to say how pleased I was with the service I received from Aldon Auto. They were very courteous, helpful and knowledgeable, and even directed us to an excellent value breakfast!! I also thought the cost was very reasonable indeed and would thoroughly recommend their services to others.

C Parks from Seaton,
Honda, CRV i-ctdi Exec
November 2010

I fitted the Tunit as soon as I got it (on time as promised) I then headed off on my scheduled trip to Wales.
I notice immediate improvements to smoothness and engine sound.
It has changed many detailed driving changes to many to identify at this time but two stand out:
Several times I thought I was in forth when I was in sixth due to improved torque and an approx 10% gain in fuel economy but that is only one trip and less than a tank of fuel.
Thanx for your help.

Saly James from Colchester,
Honda, Civic 2.2 TDi ES
12th May 2008

My husband has just had a tunit module fitted to my new car which is a Honda Civic 2.2 CTDi ES, I can say that it is fantastic!!!!!

Jason Todd from Retford ,
Honda, 2.2 I-CTDi
March 2013

Hi Dan, made it back, on way to yours I had 52mpg around 80 all the way on the way back had around 63mpg at 80mph first gear when turbo kicks in at boost is a real neck snapper though cant believe it but might actually turn it down a notch for driving round town or i wont have a flywheel or even turbo left haha

John Pope from Leicester,
Honda , C-RV 2.2 i-CTDi
March 2011

Hi Dan.
Just to let you know how I am getting on with my Tunit.
Fuel consumption has increased on local runs by 5mpg but best of all towing
performance is super have changed to a larger caravan since fitting the unit
its much quicker off the mark and it flys up the hills can keep in 6gear
much longer and is smother. Had to remove the unit when the crv went in for
service really do notice the loss of power and acceleration without it.
Will keep you updated when I do so long distance touring with the van this
John Pope

Rohit Nayar from Harrow,
Honda, Civic 1.7 d
October 2008

The honda 1.7 is a good standard car but no guts. With the ever increasing fuel costs i took the plunge and purchase a tunit with a view to reduce costs on fuel. the end result never looked backed. The car has driving characteristics are so much better. Mid range is fantastic. Bigger cars are so surprised.

Daniel Connor from Glasgow,
Honda, Civic
March 2018

Noticeable difference, long term will definitely be worth the money


John Gronow from Swansea ,
Hyundai, Tucson 2.0CRDi
March 2011

I am extremely happy with the Tucson .. which is fitted with ?all the toys?, and in terms of being an automatic, I wouldn?t drive a ?manual? ever again .. it?s fabulous. Now that I have proof of the worth of the Tunit, even though the price of ?juice? is a great concern to we motorists, I can enjoy the car even more. Finally I can confirm, hand-on-heart, that the cost of the Tunit was worth-while .. I also fitted a K & N air-filter at the time of fitting the Tunit, which, reading the information supplied, should be helping the car ?breath? better.

I have been impressed with the kindness shown by you and your staff .. my questions on the merits of Tunit were met kindly, and I appreciate that.

Gary Sherriff from Wigan,
Hyundai , Tuscon 2.0 CRDi
October 2008

Purchased tunit to add extra performance when towing. also found better erformance when solo, espcially when overtaking

Bill Tuck from Sleaford, Lincs,
Hyundai , Santafe 2.2 CRDi
November 2012

I feel inclined to put pen to paper in relation to my recent purcahse of a Tunit from your good selves. I must say how impressed I am with the improved performance-this was instantly noticeable. I am looking forward to hitching the caravan up and seeing the difference then. I which for you to know I will be recommending your products whilst out and about. Well done for a pleasant transaction.

John Gronow from Swansea ,
Hyundai, Tucson 2.0CRDi
March 2011

I am extremely happy with the Tucson .. which is fitted with ?all the toys?, and in terms of being an automatic, I wouldn?t drive a ?manual? ever again .. it?s fabulous. Now that I have proof of the worth of the Tunit, even though the price of ?juice? is a great concern to we motorists, I can enjoy the car even more. Finally I can confirm, hand-on-heart, that the cost of the Tunit was worth-while .. I also fitted a K & N air-filter at the time of fitting the Tunit, which, reading the information supplied, should be helping the car ?breath? better.

I have been impressed with the kindness shown by you and your staff .. my questions on the merits of Tunit were met kindly, and I appreciate that.


Mike Sutherland from Aberdeenshire,
Isuzu, Rodeo 3.0L
May 2009

Very impressed. Noticeably improved acceleration and responsiveness as well as slightly better economy. Towing now much easier with heavy loads as well as being more fun to drive without. Well worth the money and much better value than paying manufacturer for same engine with higher power output.


Stas Porokhnya from South Croydon,
Jeep, Patriot 2.0TD
May 2009

Since October 2008 I have had the tunit fitted in my Jeep Patriot, 07, Ltd, 2.0 VW, diesel. I am really impressed with the difference in performance (and I have had it in my Jeep for 7 months now). The main thing is the car became a springster. It's brilliant in low gears! I'd definitely recommend Tunit to whoever has modern VW diesel. My car is 4x4, and it flies and is certainly not thirsty. A big thank you for introducing me to Tuningwerkes in Croydon! My cars are now spik and span!</p>

<p>Kind regards

Andy Weller from Cambridgeshire,
Jeep, Grand Cherokee 2.8 C
18th August 2006

Tunit arrived in good time and was very easy to fit, the small picture
helped a treat! On the first outing, with the dial still set at 5, the
Jeeps MPG reading steadily rose and kept rising for about 150 miles or
so giving me about 5 miles per gallon extra.
With the dial set on at a lower number, would the fuel consumption
increase further? The 0-60 time is not of huge importance to me as the
jeep is fairly quick for its size anyway!

Regards and thanks for your help again

Anthony Bullard from Staffordshire,
Jeep, Grand Cherokee 2.7 C
May 2010

The Tunit has made the engine run more smoothly

J.S. Davies from Stourbridge,
Jeep, Cherokee 3.0 V6
August 2009

Although these are early days I have already been agreeably surprised by the significant improvement in fuel economy registered by the car's onboard computer. Although this was never really a priority in purchasing the device it is certainly a welcome bonus.</p><p>
I am a very satisfied customer and glad to have been able to find a device which my insurance firm were able to readily accept without increasing my premium too ridiculously, a device which is British instead of German or American, and a device which seems to perform as claimed.

Steve Palmer from Coalville,
Jeep, Grand Cherokee 2.8 C
October 2008

Has made a significant improvement in both mpg and performance. Has smoothed out auto gear shift, reduced turbo lag and no more plumes of black smoke when accelerating hard. Overall really impressed, considering buying one for the Wrangler as well.

Ray Lewis from London,
Jeep, Cherokee 2.8
January 2010

Throttle response below 2000rpm is much improved which means less gear changing and smoother progress in town traffic. Official MPG combined figure for my Jeep Cherokee is 33.9. At present with Tunit fitted, it is returning circa 38 MPG and I expect even better re¬sults as the mileage increases and the engine loosens up.


Stuart Wallace from Sheffield ,
Kia , Sedona
September 2011

Very pleased with service provided and achieving a 15% saving of fuel consumption. The previous 'flat spot' has also disappeared.

Paul Exton from ,
Kia, Sorento 2.2 CRDI
May 2010

At least 30% better fuel consumption when towing caravan

Dave C from Wrightington,
Kia, Sportage 2.0 CRDi

I turned my Advantage up to 6 same as the Sportage you put on test and I have my K&N air filter in. We went to Southport from Wrightington through Mawdesley, then Rufford and Holmeswood. We came back the same way and my MPG was showing 40, an increase of 8mpg.

D Kenyon from Wigton,
Kia, Sorento 2.5
10th January 2007

On the 5th December 2006 I had a Tunit V-CR fitted to my Kia Sorento 2.5.

I thought you would be interested to get some feedback on the change in performance before and after its fitting.

The car is more lively with a better take-off from standstill and when overtaking vehicles at high speeds. Towing my caravan requires less throttle and again pulling away from standstill is much improved.

These observations are, of course, subjective but I have also measured the mpg of the Kia solo and towing.

When driving solo on local and longer trips I originally achieved 32-33 mpg. After the conversion I now get 36 mpg! This is excellent.

Even better is the towing improvement. Before the conversion I got 22 mpg and after the Tunit was fitted I now get 26 mpg.

Thanks also for the Millers fuel additive and the allowance for the K&N filter I already had.

This has been one of the best investments I have made. I wish yourself and the staff a happy New Year and all the best for the future.

Derek Henderson from ,
Kia, Sorento
August 2017

I have used a Tunit device in my two Kia Sorento since 2003 and a Power Pedal unit for the past seven months. I am presently using the Advantage unit and it makes a fantastic performance gain compared to the bog standard factory setup. Pulling my 23 foot caravan or my one and a half ton trailer is effortless. Anyone following me up Greenhow Hill out of Pately Bridge in Nidderdale, a very long and steep hill, must be wondering what it is that is pulling either so quickly. The combination of the Advantage and the Power Pedal unit on the economy setting give me a range of almost 500 miles on a tank of diesel. The staff at Tunit are very knowledgable and helpful. Highly recommended.


M D Lister from ,
Lexus, IS220d
October 2008

Your technical team were very helpful with assisting me to set up the unit and even put it on the rolling road. I was amazed to see the power/torque increases....brilliant stuff but the best advantage for me in these days of increased fuel cost is the added fuel economy...excellent product spot on service what more could you ask for well done guys.


Helen from Bolton,
MAN, Wilkinson Custom Hor
September 2014

Having your own horsebox is great, especially if it has full living and you can organise weekends away. It provides a much better ride for the horses especially on longer journeys. Taking friends and their horses along adds to the enjoyment and makes owning a horsebox a wonderful social event. The downside is the cost of keeping it maintained and on the road, even with newer models. To get the best from them you need to use them regularly.
I was persuaded to take my horsebox to Tunit to try to achieve better fuel consumption and improve the emissions. If I am honest I didn’t really expect it to drive any differently, I just wanted to be a more responsible truck owner.
Prior to the fitting, the technicians at Tunit had researched my engine and assessed which unit was the most appropriate to fit; this was rechecked when I arrived and the engine was viewed. The technicians I met were all very enthusiastic and knowledgeable about their product; they explained the process and fitting as they went along and were able to answer all the questions I had. They took enough time and care to do the job to a high standard, the only negative for me was that the job took a little longer than anticipated, as some of the tools weren’t big enough for this type of vehicle!
When driving a horsebox it feels very different when it's heavily loaded compared to when it's empty however, even on the journey home I could already feel a difference in performance. I was familiar enough with how the vehicle normally handles on these local roads to notice a definite improvement in low-end power. The power is spread over the whole range of the gear which means you can accelerate evenly without hitting the rev limiter even on inclines and hills. You don't seem to need to work the gears constantly just to keep the truck moving evenly – this is especially important when you are fully loaded and I can see that this will help improve the quality of the journey for the horses.
It is still a little early

Massey Ferguson

Richard Pettit from BANFFSHIRE,
Massey Ferguson , 6465
11th October 2010



Keith R from Lincolnshire ,
Mazda , CX-7 2.2
October 2013

Just a quick feed-back for you following the fitment of your Tunit module fitted to my Mazda CX7 last Monday.
On the drive from home to your establishment I averaged @42 mpg. Following the installation, on the drive from you to my mothers home I averaged 52 mpg! On the 200 mile drive from my mothers to my home I averaged 52 mpg! No flook then!!
As indicated on the day, the car does run much smoother and the pickup and throttle response are much better.
Great job guys, I shall be towing with the car soon so shall let you know how that goes also.
Many thanks,


K Robinson from Lincs ,
Mazda , CX-7 2.2
October 2013

Hi Jamie,
To date everything is fine with your Tunit module I fitted. We have just been away touring with our caravan and the performance improvements I saw when solo driving are also evident whilst towing. The car is more responsive and pulls cleaner from low rev's, plus I have also seen a reduction in fuel consumption of around 10% whilst towing.

173BHP standard ? 193BHP with tunit.
295FTLBS standard ? 332FTLBS with tunit.

Graham Bird from Bedfordshire,
Mazda, 6 2.0 CDVI
August 2008

I purchased one of your units for the above vehicle last week at the motor show.
I am impressed with the mid range torque and response, also an improvement of 5mpg!!!
Many thanks for your advice.


David OMahony from Dublin,
Mercedes, CLS 320CDI
June 2007

Got the Tunit....if I told you it took less than 3 minutes to fit...piece of cake.

Have it on level 5 and will leave it there as there is no smoke and there is a noticeable improvement in performance (esp mid range...oodles more torque). Where the tunit does differ from the rest is that it is much more refined...I have had previous plug and plays...all these products were either full on or off which is not what I wanted for the Merc, which now is much more responsive.



Received a week later...


Have had the tunit for one week so the honeymoon period is thoughts? Its like driving a CLS 500 with the fuel economy of a diesel. I have left the module in position 5...the result oodles of torque...snappier acceleration and just all round a better car and would you believe smoother. What Merc are at with the standard ECU Ill never know.

Tunit is streets ahead of previous plug and plays I have used.

Anthony White from Middlesex,
Mercedes, ML 270 CDI
October 2008

I have always had performance upgrade on all my cars history butthe Mercedes Diesel was my first. Having visited the motorshow and did some research tunit offered value for money and true figures to what is claimed. There was a huge difference when I fitted the Tunit kit that the egineer who installed it was very impressed. Here is an expample We drove on a stretch of road standard form and we hit 74mph at a marked point.After installing Tunit the same point we hit 89mph as the tourqe band was huge. Im pleased and well happy still reliable and savings on fuel agerage mpg gone up by 5-8mpg more.A good and worthwhile investment....

Alan Meadows from Bolton,
Mercedes, E Class
December 2017

Hopefully you will have a couple of photographs of Snowy in his retirement home in sunny Spain. He is a 1996 Mercedes E class Elegance, 2 litre petrol car. I bought him from a friend where he was surplus to requirements. The car had done a genuine 76k miles from new when I bought it. There were small bits of rust on the wheel arches and the bottom of the doors as well as the alloys, so I had the alloys refurbished, the rust cured and the car resprayed. It looks, as you can see, very well and should last forever now garaged in Spain. However it was not very economical and I have had a tunit fitted to my present car, and the one before that which is now my partner's and so I enquired some time ago and was told the car wasn't suitable. Anyway this year when I asked again, or saw a new advert, not quite sure, I was told that you could do a petrol car but hadn't done so yet. So I took the plunge and had one fitted. On the 10th November we drove to Portsmouth, took the ferry to Cherbourg and then drove through France and into Spain, then down to the Costa Blanca. The car behaved beautifully, and, although we never pushed it, I think I felt a small improvement in its acceleration. Having got to Spain we pottered about in the car for a couple of weeks before I did my fuel calculations as I didn't think it would be a fair reflection just to go off the long distance driving to get there. I had kept every one of my petrol receipts and kept a note of the mileage we had travelled overall, around 2,000 miles. The previous owner had told me that he could get around 32 mpg if taking it easy. In the short time I had the car I would have said that was fair. I can tell you now, quite honestly that my calculations showed that overall we achieved more or less 38 mpg. I was delighted. Of course we were in no hurry and the car was driven with respect, but even so I think that is an excellent improvement and that having the Tunit installed was well worth it. So I'm happy

Clive Richard from Nottingham,
Mercedes, C220 CDI
October 2008

It has transformed my C220 which has the older the older engine giving lots more low down shove and increased torque all through the rev range. I was rather bored with the car before I had a Tunit - now it is rather fun to let it rip from time to time. It astonishes other drivers on motorways with its rapid acceleration.

Dave Carrington from ,
Mercedes, E220D
August 2017

I liked Tunit because it could be removed due to my new Mercedes being on lease, I have used Tunit before but the performance was a vast improvement on my last experience

Roger Darby from Northampton,
Mercedes, E-Class 220CDI
November 2006

I thought I should write to you having had a Tunit fitted to my Mercedes E-Class 220CDI Estate. I have just completed a 600 mile trip this past week end, and am delighted at the improvement in all-round performance of the car. It is so much smoother, more responsive in the 2500-3000rpm range, and has delivered a significant improvement in mpg. I am what might be described as an enthusiastic driver, and although now 70 years of age show no signs of slowing!!!! Of course, one soon becomes accustomed to the way the car now drives, and easily forgets how it used to be. I am quite honestly surprised, and very pleased at the end result and have no hesitation in recommending this modification to anyone driving a similar vehicle. Thank you for your attention before the purchase, and I am glad to report that the service offered by your Peterborough Distributor was exemplary.

Martin Kurvink from ,
Mercedes, Sprinter 213 CDI
November 2016

despite the vans size and 130hp engine whilst overtaking, the van frequently outperform's ordinary cars in acceleration

Martin Lancaster from Exeter,
Mercedes, C350
February 2018

2nd Tunit I've had. the first one has been on two Saab 93's, a Volvo V60 and now a Merc C350 - very impressed with economy improvement, drivability and increased performance - a good investment. If everyone knew what it could do you'd be unable to keep up with demand. Who wouldn't buy a product that effectively ups your engine performance to the next cubic capacity up in the range, yet drops the fuel consumption to the next model down - so it pays for itself and the kick in the backside is a bonus - it's a no brainer.

Mark Hillam from Watlington, Oxfordshire,
Mercedes, Vito 120 CDI
October 2008

Gives better response and when you get over the fun of having more power everywhere fuel economy is better and the powers there when needed

Richard Nye from ,
Mercedes, A170 CDI
September 2017

just like to thank you for reprogramming my old unit to fit on my A Class P19nye what a fantastic difference it has made smoother throttle response and a nice boost in power thanks again for a great job done.

Mark Illingworth from ,
June 2004

Just a quick note to say that I fitted the tunit over the weekend and the results are excellent.

The smooth quality original characteristics have not altered at all, however the acceleration is much stronger and longer

I have not been on the motorway yet so not sure what the MPG will be like

Thanks for all your help

Jason Gill from ,
Mercedes, E350
August 2017

I've tried a few other types (cheaper and more expensive ones) and this is by far the best. I noticed power gain straight away and have already seen 8mpg improvement on the few short trips I've done. It's easy to adjust to try the different settings and find the one that suits you best which gives you more power to accelerate up to motorway speed quickly and then cruise along using less fuel whilst also allowing safer, much quicker, easier overtakes on country roads too Thank you again for the Advatage 2b


Colin Norridge from Tatcham,
MG, ZT 2.0 CDT
24th July 2006

Unfortunately I cannot receive Men and Motors, but fortunately I do have
my own Tunit device fitted to my MG ZT! and so together with my American
car Hi-Fi system I can enjoy my own roadshow every day! What can I say,
the V-CR Tunit device works exactly as advertised (how many products can
you always say that about) and more. The engine now operates in the way
the go faster looks and rear spoiler that were original to the car
suggested it should. The pick up and acceleration are nothing short of
phenomenal and the engine is turbine smooth and almost silent whilst
cruising. The fuel consumption remains unaffected and driven with
slightly less gusto is marginally better than before.
Thank you for bringing such a brilliant device to market. A definite
must have for anyone with a turbo diesel who wishes to exploit the
vehicles full potential at such a relatively low cost witheasy

Daniel Hawthorne from High Peak, Derbyshire,
MG, ZR 2.0 iDT
September 2008

I have had the wiring looked at and tested and then repositioned and all is now working. Im very grateful to you for your help and advice along the way when Ive needed it. There is now a noticeable improvement especially mid range in both second and third gears. The bottom end is still sluggish and this has now been checked and analysed as a flat spot on the air flow sensor which needs replacing. Im very happy with the improvements the Tunit has made.


Gary Papworth from Kings Lynn ,
Mini , Cooper D 1.6
february 2012

Hi Rik,

Just to let you know I`m very happy with the Tunit on the wife?s Cooper D, couldn`t resist a rolling road session with it the other Saturday. It produced 20ft/lbs more torque than Neals Clubman JCW Cooper S (1.6 Turbo petrol), best figures achieved 137bhp and 201ft/lbs. On the road the performance is impressive, we used it to pick up a vehicle from South London the other day and fuel consumption has improved too.

Gary Papworth

Alan Stretton from Rochdale,
Mini, Cooper D
July 2009

Dear Sirs</p><p>
On a recent long weekend to the Wye Valley in our new Mini Cooper diesel, fitted with your new chip, we covered 358 miles. On the journey down there we averaged over 78mpg.</p><p>
For the whole weekend, on one tank of fuel, we averaged 74.7mpg, driving at normal speeds, not especially for economy.</p><p>
The vehicle regularly averages over the mid fifties, just running about locally. We are obviously delighted with the vehicle's performance and frugality.</p><p>


Tony Beardwood from Warrick,
Mitsubishi, L200 animal
October 2008

Immediately saw a fuel efficiency increase of 4mpg. I have not changed way I drive and now I have much more acceleration under my right foot - comes in handy. I now will not be selling my vehicle for another year as its like having a new truck!

Mike Dean from Widnes,
Mitsubishi, Shotgun 3.2 DI-DC
February 2010

I only do a low mileage but the saving is about 15 to 20%

Tim Solutham from Stonehaven,
Mitsubishi, Shogun 3.2 DiD
July 2006

Thanks for all the information. I now have a 3.2 DID complete with your
Tunit, which I ordered through my motor engineer. The difference
in performance, economy and engine flexibility is staggering. An excellent

Andrew Farthing from Bognor Regis ,
Mitsubishi, L200
August 2010

I have tried this product on the standard setting 5 and i was amazed how much off a different's its mad to the drive off the vehicle. well pleased

Lee Lyford from Oxford,
Mitsubishi, L200 2.5 TD
23rd April 2008

I had my Tunit fitted Wednesday afternoon by Rob Cotterell.....the unit
is simply awsome...very very impressive........but what impressed me
even more was Rob Cotterell himself.....he was such a nice
guy.....explained what he had to do......checked it more than
once......explained how it worked .....wired it in ,so i could take it
out myself if i ever sell the truck ......and then put it all back so
you would never know it was there......totally professional and one of
the most genuine mechanics i,ve ever met.

David Taffinder from Wakefield,
Mitsubishi, Shogun Sport
October 2008

My vehicle was a sluggish mover but with the tunit fitted its a lot more nimble

Dave from ,
Mitsubishi, Shogun
May 2010

I drive an automatic shogun and regularly tow 3t. The auto box/engine work a lot less hard with fewer changes and much better acceleration

Tim Moran from Hygga, Monmouthshire,
Mitsubishi, Shogun Sport 2.5
October 2008

Better performance, engine flexibility and response. Makes the shogun a _very_ good towing vehicle. Presently I have a camper conversion project in hand and will fit a tunit when complete.

Mark kelly from ,
Mitsubishi, L200
August 2017

I am most happy that was fitted to my Walkinshaw Mitsubishi L200, the upgrade finished the vehicle off. I will never sell it as I love the comfort, power and economics.

Adrian Forbes from Cyprus,
Mitsubishi, L200 DCi Warrior
August 2007

I would just like to thank and compliment you and Tunit on your service and promt response to all the questions I had ... upon reciveving your product I had it fitted immediatly and was ovewhelmed with the performance increase having allready had the mitubishi power upgrade your product made the vehicle drive better than I could have imagined ... I have and will continue to sing your praises .. and promote the sales of the Tunit product here on the sunny island of Cyprus.

Neil Gatward from Twyford,
Mitsubishi, L200
June 2010

We were planning a long drive (approx 1300 miles round trip) to Scotland and prior to the Tunit being fitted were looking at a diesel bill of approx GBP 380.00 for the journey, based on manufacturer consumption info. The actual cost for the journey worked out at GBP 270.00, with the unit set slightly lower than when fitted - but with the vehicle fully loaded. The Highlands presented no trouble for the vehicle, with the extra torque propelling us up slopes with amazing ease, and a much more enjoyable engine noise than the raw tone generated before the unit was fitted. My wife has already brought another unit for her VW, and a friend is buying a unit shortly for his L200 aswell. Cannot recommend these units highly enough.

New Holland

Kevin from Fife,
New Holland, T7070
February 2014

Supplied a Tunit for my tractor. Huge difference in power and economy.
Very helpful over the phone support and back up.
Definitely recommend.


Graham Hay from Banchory,
Nissan, Navara 2.5 dCI D40
October 2008

There is marked difference in power mid and top range, don't really notice in low range due to chunky tyres, I think. Have not turned up the screw..... yet, but will give it a try someday, when I'm feeling brave! If there was one for my Audi S4, I would give it a go too.

Keith Nelson from Richmond ,
Nissan , X Trail

Immeadiate noticable improvement in performance. Really pleased with purchase. Good value for money

Ben Griffiths from Conwy,
Nissan, Pathfinder 2.5 dCI
20 February 2016

Prior to fitting, the Nissan was returning an average of 37 mpg which is somewhat more than the Nissan figures, but I put that down to the area I live in, not much traffic or traffic lights. Since fitting, it is now doing over 41mpg, even with a trailer on, and the pull from 2500 rpm is terrific. It was not bad before.

B Melling from Darwen,
Nissan, Terrano II
October 2001

In August 2001 I had a Tunit II fitted by yourselves to my Nissan Terrano II. After driving for a couple of months I would like to say I am delighted with the improvement the unit has made. It is much more pleasent to drive with the increase in torque from low revs and throughout the rev range. The extra power is great.

Thank you very much. The lady on reception and your staff were very pleasent and helpful.

Nigel Trute from Maidstone, Kent,
Nissan, X-Trail 2.2 DCi
January 2010

I bought a Tunit unit for my Nissan X-Trail with some scepticism. I fitted it very easily and then the surprise, it transformed the car. </p>
<p>Much better acceleration, more flexibility and just much more enjoyable to drive, and all this from the standard setting. I am using no more fuel for this increase in performance, and use less than I was in normal day to day driving. </p>
<p>Go and buy a tunit, you will not be disappointed. 

Nick D from Warwickshire,
Nissan , Navara D22 2.5 Di
July 2013

Hi , thanks for your enquiry , yes the tunit was fitted by my mechanic last week.
I must say the change in the vehicle performance is remarkable , I can now use a higher gear going up hills locally , and with my Ifor williams 16ft trailer hooked up.
Very pleased with the outcome altogether, think it will have paid for it's self in 18 months .

Richard Rimmington from Hull,
Nissan, Navara 2.5 dCI D40
April 2007

Just to say thanks, fitted my chip last week to my Navara D40 and after trying others I am well impressed. Got it set on number 7 running fine so far, small hiccup when set on number 8 but torque is amazing. Will have to see how good fuel econ is when I start driving sensible again but I can't hep putting my foot down at the mo.

John Emmerson from Wakefield,
Nissan, Navara 2.5 dCI D40
October 2008

I need a large vehicle to transport me and my heavy shooting kit to competitions all over Europe. With fuel costs the way they are, economy on a day to day basis will always be a problem. But my Navara always does in excess of 30mpg with the Tunit fitted. The more I travel, the more I save. I once followed a Porsche Caynne for several miles in Germany on the autobahn. He slowed down at his exit to have a look at what had kept pace with him! So no complaints about performance either.

Ray Potter from Swansea ,
Nissan , Navara 2.5 dCi 171BH
November 2011

Jeremy Davies of Bernard Davies Commercials was very efficient at fitting the Tunit. I have just returned from a trip of around 800 miles. I have only checked the fuel consumption by means of the vehicle computer- not brimming the tank. This, however, shows an improvement in fuel consumption of marginally over 9%. The power/torque improvement is somewhat more difficult to quantify but on the only occasion I really booted it to try it out (not towing) it really seemed to be an improvement. When towing the torque is more obvious low down in the rev range. On main roads I seem to use around 1500-2250 revs an aweful lot. It is surprising how well I can hold top with no loss of roadspeed (measured by my Tomtom) on uphill inclines compared to previously. Also I can get into top gear much easier than previously and acceleration seems much improved. I hope this feedback is useful to you.

Thanks again to you and Jeremy

Gareth Taylor from ,
Nissan, D22 Navara
August 2017

I purchased my Tunit Standard years ago for my D22 Navara. It's 2017 and still working from the day i got it. Without it my fuel bill over the years would of...well..let's not go there, but thanks to the fuel saving capabilities from the little black box i can thankfully say i can buy a beer or two.

Mike Gregg from Preston,
Nissan, X-Trail 2.2 DCi
January 2009

Hi Dan. Did an trip to London last weekend and drove sensibly, when I hit 350 miles where the light would normally come on, I had a quarter of a tank left. I went on to 401miles before the light came on.

Great job, still got the power low down and over the moon at the economy. Thanks very much.

Mike Gregg

Boz from Yarmouth,
Nissan, Patrol 3.0 L

I want to say what a spectacular product you have. The difference the tunit made to my Nissan Patrol was spectacular.

Girish Rangan from Mumbai,
Nissan, X-Trail 2.2 DITD
January 2015

For the past four years I have been a user and a fan of Tunit, which I installed via Performance Racing Store in Mumbai. My Nissan Xtrail just rocks ever since... I keep it on the max setting of "9". Today I drove from Pune to Mumbai and back, with speeds between 130 and 160 kmph. And despite this, the vehicle delivered nearly 11kms per litre of diesel. I love the peppiness of the engine and the improved responsiveness.

Steve Lake from Maldon, Essex,
Nissan, Navara 2.5 DITD
October 2006

Just a quick note to say how impressed I am with the Tunit I had fitted to my truck. On your recommendation I had the Tunit fitted at Car Media in Sudbury, Suffolk. All I can say is that they are a great bunch of guys, they are very knowledgeable and couldn't do enough to help. As for the effects of the Tunit, I'm most impressed, it has totally transformed the truck from a bit of a slug to a tyre-smokin' beasty!

Since the Tunit has been fitted, I've found I'm getting around a 7% improvement in fuel economy, which equates to an extra 40 miles per tankful.

So thank you for a very good product and service.

Mike Gregg from Preston,
Nissan, X-Trail 2.2 DCi
May 2009

Hi Daniel, we have been down to London and up to Newcastle a couple of times and still got the extra 50 miles to the tank. Performance still better than standard. If i push it obviously the MPG goes down a bit but still over the normal 350 to a tank. So still happy, if i need any fine tuning i will ring and pop over.


Henry Leedham from Chertsey,
Nissan, Navara 2.5 dCI
December 2011

I found the tunit very easy to install and despite some sceptisism on my part about an 'add on box' as opposed to an ECU reprogramme, I am impressed with the unit. I had a motorway journey planned from North Wales to London in my Nissan Navara towing a Fifth Wheel and decided to drive half way, stay overnight, install the tunit the next morning and compare. </p>

<p>As both halves of the journey were predominantly motorway and dual carriageway, carried out in similar weather conditions (dry and blustery) and I set the cruise control to the same setting (68 mph) I think these are fairly accurate results. The first half of the journey without the Tunit the automatic gearbox seamed to be changing gear a fair bit and I achieved an average consumption of 13.1 mpg off the trip computer. The second half of the journey with the Tunit installed seamed to be more relaxed with the gearbox only changing occasionally and the vehicle able to hold it's speed more consistently, fuel consumption was 18.2 mpg, a significant improvement. I have not compared the performance when not towing in an objective manner, but subjectively it now feels more like a sports car rather than a big truck and I am averaging 32 to 34 mpg, so both performance and economy have improved.</p>

<p>I have had two vehicles with remapped ECUs - an Audi A3 2.0 TDI 140 PS and a Fiat Ducato 2.8 Motorhome. Both had impressive hikes in performance and improved fuel consumption, but not to the scale of the tunit, I have been changed from a sceptic to a convert.</p>

<p>Thanks for your help when making this decision it is not one that I will regret as I will recover the cost very quickly.

Mike Gregg from Preston,
Nissan, X-Trail
July 2010

I have put a link to Tunit on my website. Astounded at the improvement to my X Trail.

David Hayward from Pontypool,
Nissan, X-Trail 2.2 DITD
September 2008

I have fitted the unit onto the X-Trail, it took about 5 minutes, it is now like a different car! I?m currently experimenting with the different settings but the car runs great on the standard setting. What I?m most impressed with is the change to the smoothness when accelerating, instead of the jerky delayed response the car now responds as soon as your foot touches the pedal. The torque increase is great and the power, in terms of smooth accelerating is amazing; I know it?s a 4x4 but it feels like a car when driven. The investment is well worth it given the scale of change to the performance; I?m sure once I stop taking advantage of the keen acceleration that I?ll start saving money on fuel but at the moment I can?t resist the temptation to floor it!


Peter Bailey from Cornwall,
Peugeot, 407 2.2 HDI
March 2011

I bought a Tunit unit for my 2.2l Peugeot 407SW and had it fitted and tweaked by Engine Tuners in Plymouth (and what a helpful, enthusiastic and friendly bunch they are!) Over my first 500 miles of motoring, 300 mixed and 200 towing a 1.5t caravan my computer tells me I'm getting 39.8mpg. Previous consumption without towing was 42mpg at best so I'm pretty pleased with the result. As for the improvement in power and torque, quite frankly I'm not so young as I was and I find it quite scary!</p>

<p>Thanks guys.</p>

<p>Best wishes

R W Head from Chester,
Peugeot, 406 TDi
October 2006

Thanks very much for your recent service on my purchase of Tunit for my 406.
I must say that the help, assistance and service from all of you has been first class and it has been a pleasure to deal with you.

The true test came recently when I towed my caravan and awning to North Devon, where I noticed a vast improvement.

Thanks for all your help again

Ken Hicklin from Reading,
Peugeot, Boxer 2.8 HDi
November 2016

I have just completed my first round trip and covered approximately 700mile with the Tunit VCR unit fitted on a standard setting, and I have to say WOW what a difference. The ‘pick up’ power from standing start is so much better. The cruising speed is definitely quieter and smoother, with less pressure on the accelerator, and the engine is more responsive for overtaking moves, and hill inclines. I haven't yet calculated the fuel saving, but hey, that will come later. I am very impressed and will keep you posted when I’m ready to update or upgrade. Next trip coming up is a Scotland run next week of around 1,200 miles. (can’t wait)

Phil from Hertfordshire ,
Peugeot , 3008
1st March 2011

Just to let you know I had my Tunit remapped by Middlesex Tuning London and
the throttle response from standstill is more responsive and now have a
touch more torque lower down the rev range..
It`s amazing the car manufacturers don`t map these cars like yourselves!
Good work to you guys anyway..When I change my car next time I will
definately have another Tunit!


Sarah Thornton from Lanmark,
Renault, Clio
October 2008

Purchased a Tunit for my Renault Clio in summer 2007. Found the installation easy despite being far from a mechanic! The staff were happy to talk me through any questions I had pre- and post- purchase. Unfortunately I was involved in an RTA in the Clio and have since bought a diesel Leon, which my particular Tunit does not fit. Obviously this is an unforeseen circumstance and I would imagine had I had the luck to continue with the Clio for a long time period as I had expected, the Tunit would have performed exactly as described on the site. I found fuel economy to be only very slightly improved (although I did upgrade to larger alloy wheels around the same time so this would undoubtedly have increased my fuel consumption from the original wheels), and I found a marked improvement in engine performance.

Quincy Govan from Singapore,
Renault, Megane 1.9 dCi
October 2008

My main purchase intention was to extract more performance for my car. Tunit provided me this additional performance that I was looking for. Soon after that, I began to see a slight reduction in diesel consumption and this was interesting. I adjusted my driving habits, taking into account the additional performance, and the fuel savings was more regular. It seems that I now have the best of both worlds - performance when I need it most, and low fuel consumption at other times. Tunit was really easy to fit and its adjustable performance levels allowed me to experiment and find the best compromise between drivability, performance and fuel economy.

Barry Hodgkinson from Telford,
Renault, Megane 1.9 dCi
October 2008

Easy to fit, easy to adjust & a very different car to drive. Smoother gear changes, pick-up instant, acceleration mid-range incredible. All this & better fuel economy. Thank you.

Mike Saar from Brackley,
Renault, Espace 2.2 DCI
October 2008

Well, its amazing! I could not believe that fitting this little box would be like fitting a brand new engine. Power went up, so acceleration improved. We have an Auto box, and the changes became smoother. Then the big bonus - 14% improvement in economy on the school run, over 20% when doing long distance motorway. Previously our Grand Espace was stuck on 25.7mpg. since fitting the Tunit we get on average 29.5mpg. On the motorway, with a long journey we see 34mpg (before we'd be lucky to get 27mpg). So all in all, it makes for a better drive, better economy and is like buying a totally different car. Dealer serviced it recently and not a mention was given about the Tunit :-)

T I P Dummet from Cambridge,
Renault, Espace 3.0 DCI
October 2008

Since fitting the Tunit, my average fuel consumption has improved from 25 mpg to between 33 and 38 mpg and the performance of the Espace has become much more lively.

Ben Longman from Cardiff,
Renault, Master 2.5dci
April 2010

My Renault master 2.5dci has improved by about 3 mpg, when doing 1000 miles a week its a great saving.

Keith Wilkinson from ,
Renault, Clio dCI 80
June 2003

I started compiling this report to you in June, my Clio, together with it's Tunit, being 12 months old with 20,000 on the clock, but the sun kept shining so working outside took precedence over the computer. Here are some facts and figures on the cars perfomance.

Most of my driving is on country lanes and B roads with some town miles, this type of driving gives regular averages of 36 mph and 67 mpg.

I have made a number of trips to Southern England, doing most of my driving early morning to avoid delays. A typical round trip of 650 miles (90% motorway) giving averages of 69 mph and 61 mpg

Lest you think I pussyfoot around, I had to replace a 4 Continental tyres at 12,500 miles, I guess the road surfaces on North Lancs roads are abrasive...

Renault expect the Clio to return 67 mpg overall, but as I recall the long term test results in Diesel Car show consuption of their Clio to be mid 50's. Are the DC drivers thrashing their Clio, day in day out, or are the Renault figures overly optimistic? Either way I am more than happy with my Clio with the Tunit fitted.

You may recall that my Clio was the first 80 bhp you had worked on and the Tunit was tuned to give maximum performance through the gears, rolling road tested at 103bhp.

Once again thank you for your superb after sales customer service.

Haydn Nord from Nantwich, Cheshire,
Renault, Modus Van 1.5 DCI
October 2008

Excellent Fast Service. I found your employees very helpful even with after service, and also keen to answer any questions i had. Has given my car a well needed power increase and fuel economy is great.


Robert Williams from Milton Keynes ,
Rover, 75 tourer CDTI
August 2011

Power, torque and particularly engine smoothness improvements are all very impressive even after the 25 mile drive home from having it fitted.

John Ettinger from Warrington,
Rover, 75
January 2010

Runs a lot smoother more power well worth the money

Geoffrey Headley from Bradford,
Rover, 75
February 2018

On return after fitting at Killinghall Quarry Industrial Estate, my Rover 75 Diesel ran smoother and had a hell of a lot more "Get up and Go" I bought the car two weeks ago checked all of the Mots that had been done at the DVLA to establish it's 32,260 miles showing on the oddometer. David who fitted the unit at Killinghall was a joy to behold, nothing too much trouble He even fitted me a Top grade Air filter which I took there with me and he would not charge, a first class young man in my estimation a totally joyous experience. Am I glad I found I sure am.


Alan Kay from Limavady,
Saab, 9-3 TiD
October 2008

It was very easy to install with the instructions enclosed,less than 10 minuites. With the K % N Air Filter I believe the engine is smoothness is greatly increased

Nigel Bird from Ilkeston,
Saab, 9-5 1.9 TiD
June 2008

I had to write you a note to say how most impressed I am with the box I had off you for my saab 95 TDI. It runs faster, smoother and better on diesel. I am a very happy man and thank you for the help you gave me.

Ivan Buckland from Alsager,
Saab, 9-3 1.9 TiD
April 2009

Hi Dan, Have left it a while to thoroughly check my findings, and am very pleased - this last tweak, along wih the K & N filter means I am now locally on 44 to 46MPG, on a run 57 to 60MPG, the torque does not seem to be affected for it still accelerates in high gears from 1200RPM, and lots of torque by 1500RPM, but the even more surprising result over two longish but in traffic journeys tugging my 1500kg caravan gave me 36MPG, excellent. All on a tank top fill basis so no computer optimism included!

This setting certainly suits the engine.

Thanks and regards,

Tim Hutchinson from Cleveland,
Saab, 9-3 TiD
August 2005

Hi Adam,
Just to say thanks for looking after me today, I thought the service was excellent, both in terms of the package (how easy it was to book my car in, how quickly the work was completed, the road test/instruction and of course the unit itself) and indeed how pleasant and professional everyone I spoke to was.
Of course the real important thing to me is the product itself, I had obviously expected to see an improvement in performance based on what I had read on your website and indeed the various Saab forums I visit on the internet, however I can honestly say I got a bit of a shock when we went out on the test drive. At certain points in the range it really doesn?t feel like my car, there is a very clear surge of power from 3,000 rpm upwards which feels great! Had a very good run back down to Nuneaton, and really got to see what a difference it has made on the toll road! I am looking forward to learning the limits of my car all over again, I can honestly say that it feels like a new car altogether!
Too early to say what the fuel consumption will be like, but given that I have been driving the car with real ?spirit? since the unit was fitted and the estimate on my fuel computer I think it will be at least comparible than it was prior to the Tunit being fitted.
Would not delay in recommending you product or service to anyone, and I now hope to persuade my Dad to get his 530d done!
Thanks for a great service


Martin Clay from Bedfordshire ,
Seat , Leon 2.0TDi FR 170BH
April 2011

I just thought I would drop you a quick thank you message for the Tunit you supplied me recently.

The power difference compared to standard is amazing on my car. The power delivery in 3rd and 4th gears is really good.
I think I?ve shocked a couple of other drivers recently who were already driving quite powerful cars !!!
I?ve set the Tunit on setting 9.

I got 500 miles on my last tank of fuel and that was driving ?enthusiastically? &#61514;
I was only getting about 400 miles to a tank previously.

Kind regards and many thanks.

Nigel Taylor from Selby,
Seat, Leon
May 2010

I only had my car a few days before it was fitted, but I did notice a difference once fitted

Martin Caunce from Leyland,
Seat, Leon 1.6
November 2016

Have now had my Tunit Advantage for 2 and a half years, many trips to Spain and the box has paid for itself many times over, improved fuel economy, more torque and eliminated flatspots in pickup, teamed with DPP, achieve more than 60mpg round town. Have now done 50,000 miles, will be getting the Advantage 2 on my next car in March. Excellent service.

Martin Caunce from Leyland,
Seat, Leon 1.6
August 2017

Lovely pictures, anyone who wants mpg, torque and quality for money should choose Tunit!!!, been a customer for 4+ years, quality, service and a product that won't let you down, pays for itself in 12 months on a basis of 15 - 20 K per year. Thanks to the staff at Tunit.


Tim Prouten from France,
Skoda, Fabia VRS 130
June 2009

<p>It's a great product, and apart from the extra power, there really is better fuel consumption. Something I didn't really believe before I fitted it!</p>
<p>The official figures for combined consumption are 5.3l/100kms (53.3MPG). With the tunit I am at around 4.7l/100kms (60.1MPG).</p>
<p>Best regards

Ken Olsen from Surrey,
Skoda , Skoda Octavia VRS 2.
November 2011

Fitting it was a doddle, took all of 15 seconds. I love it, the midrange throttle response is brilliant. When I fill up the projected distance per tank is shown as 685 miles, where it used to show 590. I've not yet used a full tank so I can't give you definite figures, but it does look encouraging. I have left the device set at factory settings (mark 5). Is there any downside to cranking it up to full power? I suppose the next question would be if there are any benefits to cranking it up?

Allan Percy from ,
September 2017

I received my unit back on the 18th and refitted it over the weekend - what a difference. My Skoda is a different car! All “hollow diesel knock” has now disappeared and the engine performs with increased smoothness (pulling smoothly from 30 mph - 1100/1200 rpm in 4th gear!) and noticeably more pulling power through the gears. With the engine electronics now "put back to spec.” by VW after their emissions scandal and the Tunit unit working correctly, I am impressed. Thanks for your help and looking forward to greater enjoyment from my Skoda.

John Newlands from Campbeltown,
Skoda, Yeti Elegance 170
July 2011

As previously, faultless customer service and knowledge, prompt delivery, reassuring installation advice.Now looking forward to easy installation & easy,efficient driving!

Andy B from Chesterfield ,
Skoda , Fabia vRS 130
May 2013

"I was recently fortunate to receive a telephone call from the Managing Director of Tunit to inform me that I was the winner of a competition they had placed on Facebook.

Forever the sceptic, my initial response was that of disbelief, swiftly followed by "ok, I suppose you want my credit card details now, hahaha!" etc.

Fortunately, Michael convinced me that I was indeed the winner, and all that was required was that I attend their HQ at Chorley to have the unit fitted to a car of my choice.

Forever the gentleman, I decided to have the upgrade on my wifes 70k Fabia vRS 130.

So, on an unseasonably cold and (very) windy day i headed along the M1 and M62 to my appointment. The journey, at normal motorway speeds, but with severe side and headwinds, showed on the OBC that I had achieved around 60mpg, which I was very satisfield with; indeed, I wondered how Tunit could fulfil their claims that I would see improved mpg figures after fitment.

Upon arrival, I was warmly met by Lisa and Dan (who was to conduct the before-and-after rolling road sessions, and who would fit the unti), and also joined by Michael, the MD.

The first order of business was for the Fabia to be put on the rolling road; for those of you who have never seen their own car put on a rolling road, it is a very loud event and not for the faint-hearted!
Dan predicted that the engine, in standard form, would probably be near the 150bhp mark, rather than the 130bhp VAG claim; and the rolling road revealed he was absolutley spot on.

The Tunit unit was then fitted, and a further rolling road session undertaken; with the unit on the middle setting, the engine produced 176bhp. Yes, thats correct, 176bhp.

A test drive came next, accompanied by Dan.
Without wishing to wax lyrical, (and may I say I'm not on the payroll of Tunit) the on-road performance is totally transformed; overtaking manoeuvres are completed in a blink of an eye, in-gear acceleration is amazing, and the need to chang

Francis McKie from Lockerbie ,
Skoda, Fabia
September 2010

The fitting of the tunit was done in no time at all, very pleased with the results it is a totally different car now superb!

Denis Hall from Pembrokeshire,
Skoda , Superb
January 2013

I have had my unit installed for
some months, at first I had problems with fuel consumption! higher than
without the unit on. I phoned your experts and was advised to take the unit from a setting of 3 to max(9). I was also told that your operative believed that torque was the secret for performance and lower fuel consumption.
I can now after extensive use of my car towing (a 24foot van) tell you he
was spot on! I use the torque where it applies to my outfit, I can tow
comfortably at 53mph at 1600rpm, the available torque allows for a down
change if needed for hill climbing, fuel consumption 33-36 mpg over the
whole journey.
Be fair! at 1600rpm the engine is just ticking over. Now I can also tow the
same van at 70mph, now I am using the extra power supplied by the unit,
don't look for fuel savings here as I will return 25-27mpg. A word to the
wise don't expect to see any use from your unit if you use Supermaket fuel,
its crap, some time ago I stopped using Tesco and like fuels, and I now have
a different performing car.
Sorry to go on, but thought you would like to know.
Denis Hall.

Michael Lacey from Northampton,
Skoda, Octavia 1.9 Tdi
October 2008

When I sold my A6 I traded my tunit for one to fit my wife's 1.9 TDi Automatic Skoda Octavia. the installation was straight forward although a little awkward because of the way Skoda clamps the leads. Once installed we started seeing a better than 10% improvement in milage on the VAG 1.9 TDi engine which on a long trip will often show in excess of 50MPG if driven carefully.

Denis Hall from Pembrokeshire,
Skoda, Superb
September 2011

I have had my unit installed for
some months, at first I had problems with fuel consumption! higher than
without the unit in. I phoned your experts and was advised to take the unit
from a setting of 3 to max(9). I was also told that your operative believed
that torque was the secret for performance and lower fuel consumption.
I can now after extensive use of my car towing (a 24foot van) tell you he
was spot on! I use the torque where it applies to my outfit, I can tow
comfortably at 53mph at 1600rpm, the available torque allows for a down
change if needed for hill climbing, fuel consumption 33-36 mpg over the
whole journey.
Be fair! at 1600rpm the engine is just ticking over. Now I can also tow the
same van at 70mph, now I am using the extra power supplied by the unit,
don't look for fuel savings here as I will return 25-27mpg. A word to the
wise don't expect to see any use from your unit if you use Supermaket fuel,
its crap, Some time ago I stopped using Tesco and like fuels, and I now have
a different performing car.
Sorry to go on, but thought you would like to know.
Denis Hall.

Charlie Daniels from ,
Skoda, Superb TDI
August 2017

Absoloutly delighted and it is the 3rd Tunit I have had. A brilliant piece of kit giving 34 more BHP according to the dyno

Ian from Glasgow,
Skoda, Octavia 2.0 TDI
September 2010

Hi, Congratulations and well done for the help you have given our troops in
the battlefield. I am sure the whole country would echo our thanks if they
were aware of how Tunit have been able to resolve the problems they had been
<p>My son has proved over and over just how good Tunit is at boosting
performance in his fast response Skoda Octavia and it is just possible that
by cutting his running time to serious incidents Tunit may have indirectly
contributed to saving lives. At the very least this has helped the victims
get the earliest possible attention from a highly trained doctor and this
alone must have been of great relief and comfort not only to the victims but
to all those involved on scene.</p>
<p>He also has the added bonus of economy and reduced emissions so it is a
total Win! Win! Situation to use Tunit.</p>
<p>I am so pleased that I recommended Tunit to him.</p>

andy Barber from Derbyshire ,
Skoda , Fabia VRS 1.9
April 2013

Visited Tunit in Chorley where I was warmly greeted by Lisa, Dan and Michael.
To cut a long story short, I brought my wife's 2006 Skoda Fabia vRS 1.9, which gave 150.1bhp and 269.4 lb/ft torque when placed on the rolling road.
After Tunit weaved their magic, the figures rose to 176.2mpg and 318.2 lb/ft torque. Plus, average mpg ony journey there was 62; on the way back it averaged 68!Impressed? You bet! Driving impressions? Stunning!
Would I recommend you visit them? Unequivocally 'yes'! I will be submitting a full review shortly, suffice to say I am suitably impressed with Tunit! But don't just take my word for it, go and visit them yourselves; you WON'T be disappointed!


Stuart Turner from Chorley,
Subaru, Legacy 2.0TDI
March 2009


<p>I appreciate its early days but I thought I would let you know how pleased I am after Tuesday. Well more than pleased!!!</p>

<p>What was an excellent engine before has now been improved no end all round. I find myself wanting to drive it for no good reason other than to enjoy the released potential.</p>

<p>For example I had to go over to Leeds late tuesday night the M62 was quiet so the best way to describe it is "I drove it like i stole it". For the purposes of testing it out. I dont mean just high speeds fifth gear an all round caning.</p>

<p>When I got home around 150 miles later i did a double take mpg was showing 48.6.</p>

<p>Although my car gets well used doubt if I have ever given it the grief it had then so the mpg was a big surprise. Conservatively that's an increase of 6 or 7 mpg.</p>

<p>When I revert back to my "normal" mode I am sure the mpg will be even better.</p>

<p>As you could see I am no boy racer just a car enthusiast so not interested in top speed or 0 to 60 mph etc.</p>

<p>But at the other end of the scale as part of my testing i took it on a local industrial estate tonight and just leaving at tickover had it pottering around in third gear no problem even on a slight incline. No judder snatching etc. Third is long legged as well. Not something you do often but just shows the other side. Prior to the Tunit wouldnt do that at all.</p>

<p>So as you can see I am well pleased to say the least.</p>

<p>Obviously I will monitor the mpg over a full tank but i think I know what the result will be.</p>

<p>Thanks for the excellent all round service I received you have a good friendly set up there.</p>


Murray Donaldson from Aylesham,
Toyota , Hilux 3.0 D-4D 171BH
July 2011

Fantastic increase in fuel economy 7miles to the gallon from 24.4 to 31.5 very pleased

W Oeder from Kent ,
Toyota, Hilux Tiger 3.0
July 2013

Hi Jamie,

Just a short update- I used to get around 450kms on a tank @ 65-70mph. Now I have done around the same milage at the same speed and the tank is just under half full still! The power is phenomenal, and as I said previously the drive is much more enjoyable.

Kind Regards

Ian Bilke from Maidstone, Kent,
Toyota, Hilux Surf
October 2008

I run my surf on bio-diesel and at times it would not pull. but now it runs smoother and quicker

R Wright from Swaffham, Norfolk,
Toyota, Hilux 3.0 D-4D
October 2008

It does exactly what was claimed

Colin Davis from Suffolk ,
Toyota , RAV-4
8th March 2011

Very good customer care at gorse motors and very pleased with the performance of my Rav in all aspects ie better in the gears, able to keep in higher gear up hills,at present only had the unit ashort while but miles per gallon has improved cant wait to tow my caravan fill confident it will pull better.

Zarb Tancred from Malta,
Toyota, Landcruiser 3.0 TD 1
December 2011

I bought a K&N air filter from a local shop which replaces the factory one and the engine works much better and also sounds better. I went abroad with my car and was impressed with the difference at top speed and fuel consumption the Tunit made. Here in Malta we don't have long roads so I tried it while I was in Italy. Two years ago I went to Italy and the fastest I went was 155kph. This time with the Tunit I went 170kph and would have gone further but the speedometer only reads up to 170kph. Here in Malta I'm doing about 75 km extra with a full tank with the Tunit.

Rolly Knowles from Australia,
Toyota, GXL Turbo Diesel

<p class="yellow">Hello Troy,</p>
<p class="yellow">I thought that I show drop you a note about my satisfaction with the Tunit Model V-VP that was installed in my 2004 Toyota GXL Turbo Diesel 100 series Auto Station wagon.</p>
<p class="yellow">This was the vehicle that was Dyno Tested at Labrador after installation.</p>
<p class="yellow">The following are a series of consumption figures that I have achieved in the first month on the road.<br />
<table class="indent" width="70%" border="1">
<th scope="col"><U>Kilometres driven</U></th>
<th scope="col"><U>Fuel Used in Litres</U></th>
<th scope="col"><U>Kilometres / litre</U></th>
<th scope="col"><U>Litres / 100 km</U></th>
<p><br />
The first reading was with the Tunit setting at 6 (as you had set it after the Dyno) and also included the climb through the hills to Canungra and then over Cunninghams Gap to Warwick with our

Alastair Moss from Buxton,
Toyota, Hilux 2.5 D-4D
October 2008

They are fantastic, easy to install, I like the ability to adjust the box if you want low down pulling power or top end speed, and it paid for itself within a couple of months what more can you ask for.

Paul Nicholas from Basingstoke,
Toyota , Avensis 2.0D-4D
August 2012

Can now leave in gear on lower revs and reduce number of gear changes, also pulling smoothly throughout rev range ? Just need to fit new tyres on the front wheels to further improve mpg! Improved to 64.8mpg ? 16.5% better.

Trevor Francis from Suffolk,
Toyota , Previa
August 2011

The Tunit was fitted to my Toyota Previa. This transformed my Previa (114 bhp) from a `Gutless Wonder` to a car able to keep up with the likes of Galaxy and Espace and leave them behind on hills. At the same time my fuel consumption went from 36/37 to a fantastic 44/46 m.p.g without me even trying to achieve an improvement. I was more than satisfied.

Ian from Middlewich,
Toyota, Rav 4 2.0 D-4D
September 2014

Arrived quickly and what a piece of kit!
Fitted to my 2004 Rav4 and the acceleration, performance, fuel consumption, pretty much general running of the engine is unbelievable!
Not played with the settings yet but will be doing soon.
As for fitting, if you do have a Gen2 Rav4 take it to be fitted for you due to the fiddly area of rail senor!

colin Holmes from Hereford,
Toyota, Rav 4 2.0 D-4D
October 08

Have been running Rav on setting number 8 for a while and fuel consumption on average about 5% better than standard but because the engine responds better I do tend to drive quicker than I should so don't save as much as I probably could. Torque much better because I can drive in higher gears at lower speeds than standard set up. Tows 2008 Swift Challenger 480 really easily without too much gear changing. Have recently moved the control to number 9 and so far seems to have improved performance and torque even more. I was talking to fellow tower with standard Rav 2.0 D4D and he was saying he was disappointed that he had to keep changing gear when towing due to lack of torque. I did give him your phone number.

Very pleased with the system in general. Easy to fit except for the silly place Toyota put the fuel rail connector plug.

John Spencer from Halifax,
Toyota, Landcruiser HJ100 4.
October 2008

Originally found Toyota sluggish and fuel economy not great. Towing greatly improved as did fuel economy and performance

Paul Mcdonnell from ,
Toyota, Landcruiser LC90 3.0
October 2008

I was interested in fuel economy and visited the Co.s stand at the London M.Show. Very professional service in acquiring the right unit for my car, I installed it myself and technical support was first class with Tunit staff really interested, helpful and available when I needed them. The very best customer care. Product really makes a differnce in performance and economy.

Amit Shivkumar from Swansea,
Toyota , RAV 4
May 2011

After installing the TUNIT the milage has improved from 24 mpg (in City) to 34.1 mpg (in City).

Steve Watson from Bolton ,
Toyota, RAV 4 2.2

Tunit changed over from my old car and re programmed for my Rav 4 2.2d. on short runs before the tunit was fitted I was getting 26.2mpg, now with the tunit it is between 29.2-33. On motorway runs this has shown a massive improvement from 41.3 to 50.02, very happy!!!

Matthew Hewes from Chelmsford,
Toyota, Hilux 3.0 D-4D
October 2008

Excellent performance, an instant noticable difference

Graham Rasmussen from Suffolk,
Toyota, Rav 4 2.0 D-4D
October 2008

it does what you said it does on both ecomomy and performance but my reason for purchase was performance and this im very pleased with

Stewart Vann from Stockport,
Toyota, Hilux 2.5 D-4D
November 2010

Many thanks for the customer support enquiry. The answer is Yes we managed to fit the device successfully.

We have left it on the factory setting 5 and it has transformed the engine. It has improved the fuel burn from cold , the engine smoked a little originally even though it had only covered 20,000 miles. It is noticeably more powerful through the rev range and clearly has more torque than the stock programming.

We are very pleased so far and would recommend your product.

Kind regards


Zarb Tancred from Malta ,
Toyota , Hilux Surf 3.0 TD 1K
October 2011

The result is excellent. I can't beleive the difference it made. As I press the full trottle the car just goes mad.
Thanks alot for all your help and for your excellent service. Did you ever sell one to Malta before?

I. Clough from Manchester,
Toyota, Hilux 3.0
July 2015

Alright Chris, Just a quick email to let you know how pleased I am with the figures coming back for the average MPG after having the Tunit fitted. On a steady journey up to the NW coast of Cumbria: Without Tunit average 38.8MPG With Tunit average 47.2MPG All I can say is what an amazing bit of kit it is. Thanks

G Rasmussen from Suffolk,
Toyota, Rav 4 2.0 D-4D
October 08

Had it fitted yesterday at Gorse Motors Barnham. The test drive was great and the drive home even better. Well impressed at this time - could be a good decision having it done, my Rav's performance is much improved. I may also get my Maxus van done later.

Ray Roberts from Ellesmere Port,
Toyota, Rav 4 2.0 D-4D
October 2008

Fun to own, fun to use.

Joe Ainscow from Bury,
Toyota, Hilux
October 2008

The Hilux is used to tow machinery and tools to and from jobs every day. These can be up to 30 miles away. A trailer is being towed nearly all the time with either a tonne or so of topsoil or hardcore or a mini-digger in. This is why the large torque gains where so beneficial to me and the company. This extra torque meant that the fully laden trailer could be pulled at far lower revs resulting in huge gains in fuel economy. The extra power when the trailer is taken off from the tunit still impresses me everytime.


Kieth Godbolt from Hook, Hampshire,
Volvo, S80
October 2008

Good improvement to smoothness of volvo D5 (not the smoothest diesel in the world) and noticeable low-mid range power. Very happy with improvement.

Keith Godbolt from ,

Just wanted to update you with progress.
No problems fitting the unit now - quite clear where the little tinker is supposed to reside. Plug fitted in-circuit in about 10 mins then a bit of head scratching on where to position the unit itself. In the end I went for what looks like a redundant plastic bracket at the front of the air filter assembly on nearside (I'm thinking plastic might reduce vibration somewhat) and the cable routes alongside other cables on top of the rad. This also makes it easy to uninstall for service time (I'm a bit paranoid about Volvo dealer whingeing about warranty etc. so I'll take the short time to remove and refit as it's so straightforward). Couldn't resist tweaking the dial from 5 to 6 but won't go beyond that - no need in retrospect.

Results: Amazing! Very, very impressed that such a straightforward addition can provide substantive and noticeable all round improvements - without any apparent compromises (are there any?) - specifically:

- Engine is much smoother, particularly at idle up to about 1600 rpm which is normal 'about town' traffic; is also smoother at motorway speeds
- Noticeable improvement in power/torque at mid- high-range rpm and certainly faster pick up from low revs - there was a considerable 'lag' before that has reduced considerably. It's a different drive.
- After just one weekend and about 250 miles of mixed motoring the mpg meter is returning an improvement of +2mpg to normal (now just over 48mpg) - I've not got over this before and I'm certain with some longer runs this is going to be much improved - I'll let you know in a month's time how it's going.

End result - very happy for now. What I don't understand is how or why Volvo with all their R&D capability can't deliver this on the car itself? Or is this just 2 years of technology development?

Thanks a

Alan Callander from ,
Volvo, xc90
January 2017

Fitted the advantage 2 to my volvo xc90, very impressed with the results, alot smoother and more power???? thanks again

Alan Callander from Kirkcudbright,
Volvo, xc90
November 2016

Fitted the advantage 2 to my volvo xc90, very impressed with the results, alot smoother and more power thanks again

Ian Robertson from Berwick-upon-Tweed, Northumber,
Volvo, V70 D5
October 2008

easy to fix. does increase power and helps fuel efficency

Andy Bucktrout from Normanton,
Volvo, s60
May 2010

I like the economy the tunit offers but when the opportunity presents its self i love the increased power and acceration it generates. I tend to walk locally and only use my car (volvo s60)for journeys of any distance, however using your, Tunit, a k&n filter and shell "v" power diesel & keeping to 68/70 mph on a trip north up the a1 which included a long stretch of 50mph road works, at the end of which the cars on board computer was telling me i was averaging 75 miles to the gallon.... how good was that!!!! When trying something new the type of warranty your firm offers gave me the confidence to spend what first appears to be a lot of money.... something I wouldn't have done without the "try be for you buy" offer and the guarantee.


Simon from Leyland,
VW, Golf V 2.0 TDI
May 2014

I've had a Tunit on my 3.2 turbo diesel Mitsubishi Triton for almost 3 years and I don't regret a single moment.

Daniel from Australia,
VW, Golf 2.0 TDI
April 2006

Received chip for Martins car and installed it in 5 minutes. Was extremely impressed with the improved power and torque.
Martins son and myself both picked up new 2.0 tdi Golfs today so I imagine you will be getting an order for another 2 in the not to distant future.
Thanks again very impressed with the chip and service you have provided.

Frank Guest from Wirral, Merseyside,
VW, Golf 2.0 TDI
October 2008

Very impressed. I liked it that much I even wrote a review of it in the Volkwagen Driver magazine. April and May issues 2008.

J Boylan from West Sussex,
VW, Golf 1.9 TDI
July 2010

Just thought I would let you know how the tuning is going on my Golf.

I usually use nigh on half a tank to get to my parents.I arrived,and found Id used a fraction under a QUARTER of a tank,averaging 60mpg!

Thanks for all your help.

Paul from Bristol,
VW, Amarok
November 2014

I had the Tunit for 2weeks now and what a hell of a difference. Lots more power and extra 2 miles to the gallon. Here are some figures from my VW Amarok Auto.

Standard: 27-31MPG.
Old Tunit V-CR: 28-33 MPG.
New Tunit Advantage 2: 30-35 MPG and improving.

Dennis Read from Leyland,
VW, Sharan
November 2016

With a Tunit you are in a higher gear everywhere you go

David Pearce from Hinckly, Leicestershire,
VW, Touareg 3.0 TDI V6
October 2008

The Touareg power is smother & it feels quicker 30-50. 50-70 etc.

Nigel Kearney from High Peak,
VW, Scirocco 2.0 TDI
June 2009

<p>With regards to the Scirocco I can make a number of observations since the Tunit has been fitted:</p>
<p> &middot; The fuel consumption has improved with the journey back from Silverstone showing 61.5 mpg travelling at an average of 80mph the car having 3 passengers plus me and a boot full of luggage. The overall average is holding at 53.5mpg being approx 8% better than before the unit was fitted.<br />
<br />
&middot; Performance wise the pulling power has noticeably improved giving a sense of urgency to the acceleration. The set up of the Scirocco with its lower profile wider tyres and sportier suspension seems more than able to cope with the increase and I would suggest that it could manage a little more. This is born out with the introduction of the 260bhp S3 version recent shown in the Top Gear Mag.<br />
<br />
&middot; The drivability is still as good as before the mod.</p>

Douglas Brook from Loughborough,
VW, Passat 2.0 TDI
December 2011

I have had a tunit unit fitted to my VW Passat estate now for about 7 months, and it's great. Performance and fuel economy as well. What more could you ask for. Well Done Tunit, and Best Wishes for the new Year. I hope your sales of tunit units rocket so fast that you can't keep up with demand.</p>

<p>Happy Christmas to all.

Martin M from Didcot,
VW, Jeta 2.0 TDI CR
June 2016

Got my new unit, brilliant as normal!

hazel from ,
VW, Passat
May 2003

Well, words can't describe it. I think that I said to you that I never expected to change my other Passat and this one was in fact a most unexpected present (some present!!) and I bought the tunit, which makes the car absolutely stunning. It is such a wonderful combination of power, torque and flexibilty; I find it breathtaking - as do all passengers to date. I can hardly wait to see how it performs with the caravan when I set out tomorrow. I will send you a postcard from Provence to let you know what the verdict is, but I know that it will be superb. I have always loved cars, but have never driven anything like this. I just can't thank you enough

Nigel Kearney from High Peak, Derbyshire,
VW, Golf 2.0 TDI
October 2008

After fitting had laptop tune. Tested on Tunit rolling road and tested against Golf 2.0TDi 170bhp by VW Driver mag. More power and torque than the 170 plus would pull in 6th from 1000rpm. This is now a very quick car delivering 50+ average mpg.(or more if you take off the lead boot)

H Smith from Powys,
VW, Caravelle
November 2010

Very, very impressed. Totally transforms the vehicle. Pulls from much lower down, smoothing out the point where the turbo comes in. An absolute joy to drive. I'm sure you've had all the superlatives before from previous customers but I honestly think it one the best things I've ever bought and for this reason I'm recommending to anyone I know who wouldn't be bored with me banging on about engines.

Richard from Preston,
VW, Golf V 2.0 TDI
November 2014

After much deliberation of what performance enhancing product I was goin to use to improve my VW Golf GT TDi I am sure I have opted for the correct decision, greatly improved low end torque and noticeable power gains with fuel economy! I am a happy man! And I am still on setting 5, Thanks Tunit!

Andy Watson from ,
VW, Transporter T4
September 2017

Having bought a second hand VW Transporter T4 many years ago without the intercooler, I always felt it was a little sluggish. It just needed a bit more get up and go. A friend mentioned Tunit to me and one was soon fitted. What an amazing difference it made. It felt like the engine had been set free. Much more umph which made it easier to drive and about 10% more mpg. The centre that I bought it from were very helpful in getting it set up how I wanted with a little tweek here and there when ever I passed by. It didn't take long before I fitted one to my Skoda Fabia VRS. This was just incredible. It took off like a rocket, had so much more get up and go, more fuel economy - about 12% better and was even more enjoyable to drive. When the good old T4 finally had to go and was replaced by a T5, I knew I'd be OK with the lower hp model because I could add a Tunit to that. Once again there was a total revelation in the power from the new van. At least 10% better fuel economy along with the usual other benefits. When ever I now tow a trailer I just turn up the Tunit to 10 to give me a bit more power, which helps immensely when pulling away with a heavy load up hill. Superb is a good word to describe these units and several of my friends that now have them would agree.

Nick Ridgeway from Essex,
VW, Bora 1.9TDI 115
Oct 07

I?m really pleased with the Boras performance since you worked your magic.

283 lb/ft of peak torque and minimum 234 lb/ft (the standard spec peak) available between 1700 and 3200 RPM has transformed the drive.

The motorway overtake manoeuvre is now: let the car pass by, accelerate (in 6th) and pull out - oh and then brake to avoid running into back of the car that has just overtaken me :)

Well pleased.

We have a trip to Lindisfarne next week in Northumberland and en route there are a few longish A road climbs where it should excel.

I?ll keep you posted about my MPG.

Follow up email, received 23rd October 2007:

Hi Dan,

I thought I would give you an update.

The Bora performed extremely well enroute to Holy Island up in Northumberland. It was always good on hills, but now they cease to exist!. I think the fuel consumption remains as good as it was before the Tunit was fitted, 61 MPG on the trip covering the 200 miles in 210 minutes with a full load and a tide to catch avoid gives little cause for complaint!

My perception is that 4th gear now accelerates the way 3rd used to do and 6th in turn accelerates like 5th did. But of course has a much wider range which is redoubled because the torque hangs in much longer.

Imagine if it had a seven speed box.

I would also like to thank you again for the excellent & conscientious service you provided.

Alan Cooper from Coalville, Leicestershire,
VW, Bora 1.9 TDI-PD
October 2008

My VW is smoother when accelerating through the gears, pulling stronger from lower revs. Motorway driving is more relaxed with the extra top gear pulling power. Very pleased with my tunit.

Joe Tapp from Milton Keynes,
VW, Golf
February 2010

Instant power great bit of kit wish i brought one years ago!

Martin Macqueen from Oxfordshire,
VW, Jetta 2.0 TDI CR 140
February 2012

Hi Rik,

I got the Tunit box this morning as you said and fitted it in ten minutes!
Brilliant results, superb fuelling and smooth power delivery. The car really pulls harder in the higher gears and is lovely to drive. I drove a 2000 mile road trip and on average i was getting 54.3 MPG, that is a massive improvement from what i was getting before. Very pleased and your service was top notch. Once again many thanks, a fantastic product.

Best Regards,

Martin Macqueen.

Jordan Entwistle from Chorley,
VW, Polo 1.4 Blue GT
April 2017

I would highly recommend Tunit, great customer service. Both the Optimum Plus and Power Pedal have made a considerable difference to my car with regards to acceleration. Considering I can change the settings on the Optimum Plus, I have never actually wanted to and have been more than happy with it on Sport +. Glad I bought these instead of getting a re-map as I can unplug and plug in whenever I want; it’s great!

Haydn Lipscombe from Birkenhead, Merseyside,
VW, Touareg 2.5
January 2009

The tunit absolutley transforms the car. I was
beginning to wish I had bought the 3 litre, but no need now. Brilliant
service and product, I will spread the word. I think most people are
sceptical of these things, but once tried you become an instant
believer, and a very happy one at that.


Christopher Purvis from Exeter,
VW, Touran 2.0 TDI 170
October 2008

I won TUNIT through VW Driver Mag. I have been very impressed with it, especially the way in which it has improved the driveability of my vehicle.

William Groves from County Down, Northern Ireland,
VW, Marine SDI
August 2010

Fitted it to the vw marine sdi 75-5 on the middle setting. Improvement right away, rpm increased from 3100 to 3550 with acceleration improved. Top speed also up on the Arvor 190 from a struggling 10 knots to a terrific 15.5 knots.</p><p> I am more than satisfied and no need to increase performance any more on the tunit. 100% thanks again.