FAQ Your important questions answered

Got a query about diesel tuning? Here are some of our most frequently asked questions.

Most Popular

  • When un-plugged will my vehicle return to factory-standard?

    Yes. The chip has been designed to work safely alongside your original ECU, not to replace it. So just as the chip can be easily installed in minutes, so it can be easily un-plugged too. When removed your vehicle is once again factory-standard, the system is non-permanent leaving no trace of fitment in the vehicle's memory whatsoever.

  • Where can I find the details for my vehicles engine variant?

    This information can be found on your vehicle registration document known as a V5 log book in the UK. Feel free to contact us with your UK vehicle registration number and we can run a plate check to confirm the system you require.

  • When does my 28 day money back guarantee begin?

    Your 28 day trial period begins from the date goods are received, not the purchase date. Should you decide to return simply do so postmarked within the first 28 days with a cover letter, upon receiving your return we will email confirmation of your full purchase price refund - which will be made via your original payment method within 7 working days. The only cost should you decide not to keep is the cost of return postage.


  • For UK shipping which carrier do you use?

    We ship using Royal Mail's tracked and signed for service within the UK for a guaranteed next weekday delivery. If you miss delivery a notice card will be left for you to pick up at your local Royal Mail office or arrange a convenient free re-delivery.

  • For international shipping which carrier do you use?

    We use Royal Mail's International Tracked & Signed for service. Your item is then delivered using your countries national postal service. If you miss delivery a notice card will be left for you to pick up at your local collection centre or arrange redelivery.


  • If ordering from outside the UK how is payment taken?

    When ordering from outside the UK the £ Sterling amount will automatically be converted into your local currency by PayPal or your card issuer using up-to-the-minute, competitive exchange rates, this will be shown on your billing statement. A full invoice will then be sent electronically via email for safekeeping and printing.


  • Is the CHIP Express™ system simple to fit and remove?

    The CHIP Express™ system can easily be self installed in minutes using photo illustrated instructions supplied. It simply uses plug in connectors, no special tools or skills are required and no wires need cutting. Once familiarised with the procedure fitting or removal can be carried out in just a few minutes.

  • Is there any complicated setting up to do?

    No. Every one of our systems comes ready for use, already set for optimum power and economy, right out of the box.

  • Does that mean the system can't be adjusted?

    No. If you want to explore the higher limits of performance which your vehicle is capable of, every CHIP Express™ digital tuning box has simple adjustment so you can increase or decrease the power easily – this is all fully explained with the instructions supplied. Most customers, however, are more than happy with the supplied settings.


  • What warranties does the CHIP Express™ system provide?

    First is our class-leading product warranty which guarantees your unit against manufacturing defects. Second is our 28 day "no quibble" money-back guarantee which means you can order now with complete confidence and if the unit does not perform exactly as we describe, you can return it within 28 days in its original box and condition and receive a prompt refund.

Change of Vehicle

  • Can I re-use my chip if I change vehicles?

    On most vehicles you can keep your existing tuning module. Usually all that is required is re-programming and possibly a new adaptor cable, for this we charge between £99 and £149 (please email to verify). Please contact us for further details to check the compatibility of your current system.


  • How does the system work?

    The CHIP Express™ system works to take advantage of the engines lean running to enhance performance via the re-configuration of the injection system, all within the safe parameters of the engine. Superior atomisation provides uniform and optimised combustion during each injector duty cycle, for better performance efficiency at all engine speeds, as a result of this turbo boost pressure levels will also build up much sooner without exceeding safe limits, reducing throttle lag and making for a more linear power delivery.

  • Do CHIP Express™ upgrades work in automatic vehicles?

    Yes, all our upgrades are compatible with the latest automatic transmissions. As long as your engine is listed on our vehicle finder it can be safely tuned whether it is a manual or automatic.

  • How is less fuel consumption possible?

    The CHIP Express™ tuning box increases the power and torque characteristics of the engine. This means you can achieve the same style of driving with less throttle at lower RPM's, meaning that down changing becomes less frequent and higher gears can now be used sooner.

  • My vehicle has a diesel particle filter and AdBlue (urea injection), is this an issue?

    Installation poses no issues for vehicles fitted with with diesel particle filters and those that additionally use the latest AdBlue urea injection emission control additives.

  • Will the chip help with overtaking?

    Yes, because your vehicle now has a significantly improved power to weight ratio in gear acceleration times will be much improved, this is particularly important if you tow a caravan or drive a laden vehicle.

  • Why did the manufacturer not offer tuning in the first place?

    Put simply, your vehicle's intended performance is restricted because car manufacturers have to allow for model variants that often use the same engine mechanicals with adjusted power figures. As well as this, many countries around the world relate their tax levels to the power output of a vehicle.

  • Can the unit damage my engine?

    The safety of your engine is our number one priority. Each CHIP Express™ system has been designed to work alongside – not instead of – your engine's original ECU. As such, it respects all of the ECU's inbuilt safety parameters.

  • Will my vehicle still pass emission tests?

    Yes, a further advantage of all CHIP Express™ systems is their compliance with vehicle emissions standards; whether it has a particulate filter or urea injection, there's a CHIP Express™ system designed specifically for it.

  • Will I achieve the figures published?

    Our figures represent the values you can achieve depending on your tuning box settings and vehicle setup. Remember the figures do not tell the full story. With a CHIP Express™ system fitted both peak power and torque will arrive sooner and be held for longer. This means that more of the rev range is useable, rather then just the usual narrow power band. This provides faster acceleration where necessary as well as more flexibility through the gears.

  • Is the CHIP Express™ system suitable for high mileage drivers?

    Yes, many fleets and taxi drivers use our systems to save fuel. Apart from the economy benefits the increased power makes distance or prolonged driving more pleasurable and relaxed due to the extra torque provided by the tuning system.

  • What about maintenance?

    The CHIP Express™ tuning box is 100% maintenance-free and has no serviceable parts, just plug in and enjoy!

  • Will it make my vehicle smoke or run rough?

    No. In fact, the CHIP Express™ tuning box can even clean up your vehicle emissions by increasing the efficiency of the injection system, which will lead to smoother, quieter running.


  • If I have an issue with my chip how can you help?

    Simply contact us via phone or email right away and let us know your issue. We will then work on this as a priority to ensure your problem is resolved swiftly under warranty free of charge. Remember you can always unplug your chip to ensure any cause is in fact related.

  • How do I know if the tuning chip is working?

    You will feel a dramatic increase in power right away!

  • What about my vehicle insurance?

    Many insurance companies do not charge extra for vehicles fitted with an 'engine chip' while others charge a small fee; if you are un sure, we suggest you check with your insurance company before installation. Insurance companies that should allow up to 25% increases include: Elephant, the AA, Liverpool Victoria (LV) and Aviva; however you may find you get a much better deal from the likes of a specialist such as Adrian Flux or Chris Knott when it comes time to renewal.

  • I have a question you haven't covered above – can you help?

    You can email us or call us at +44 (0) 1727 730 956. However you choose to get in touch, we'll be more than happy to help and advise you in any way we can.

Any questions?

We're here to help! So contact us, or read our FAQs.

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What others are saying...

“May I congratulate you on this diesel tuning product as it has made a noticeable difference to my Land Rover Discovery. I have tried other diesel tuning boxes for my previous vehicles (Kia Sorento, Peugeot 206 and Vauxhall Vectra)... and they all produced slight engine stuttering under certain load conditions. The CHIP Express system does not show any evidence of this and is equal to the likes of an ECU remap (which I have also had done before) for smoothness and noticeable power gains. This would be the only diesel tuning product I would recommend.”


James from Callington

Land Rover Discovery (3) 2.7 TDV6 190

“As do many, I took the 'if it sounds too good to be true, it probably is' approach to performance chips. But CHIP Express were recommended by an impeccable source who had had experience with their product on my model of car - a Citroën C6 with the 2.7 HDi twin turbo diesel. Following a first rate response to a query, the product has delivered in spades. Ten days and more than 1000 miles of mixed town, country, low and high speed driving later I am certainly getting more than 10% more from a gallon, and probably 15%, and the performance is markedly better. Low speed response is immediate and has eradicated what I took to be baked-in lag in a big automatic turbo diesel, and mid-range acceleration is silky smooth, including up inclines. A very good car has been turned into the excellent car I had hoped for all along.”


Simon from Ketteringham

Citroen C6 2.7 HDi 204

“I was a sceptic at first, then after reading the experiences others had been through I decided to give it a go. I bought a new 1.7 CRDI Sportage, not the 2ltr purely for better fuel figures. Whilst this engine pulls very well in standard form, and was returning 44-45mpg even during the first 500 miles I had to go down the CHIP Express route. Well, there is absolutely no point in forking out the extra 2 grand for the 2 litre model when you can get the 1.7 and spend much less to get 2 litre power figures. Excuse the cliché’s, but this car is transformed and by a big margin too. From what I can remember about my 2 litre test drive, my 1.7 now pulls better than the 2 litre version. The low-down grunt is remarkable and pulls like the proverbial train. Fitting took minutes and was effortless, the box was kept on factory settings, I feel there is no need to mess with it. Needless to say I am now a very happy boy and would without question take this route again. I would recommend this to any diesel Sportage owner. Many, many thanks for a remarkable product and a customer service that is rare in this country!”


Ron from Thetford

Kia Sportage MK3 1.7 CRDI 116

“A good product and a good service deserves recognition: I fitted a CHIP Express unit to my Insignia. What an amazing bit of kit! My fuel economy and performance went way up and with the mileage I do was a Godsend! On a run to Aberdeen from Hull I returned an average of 62 MPG and I drive quite energetically! I've just taken up the trade in offer and saved a few quid on a new system. The Vauxhall has now gone with 125,000 trouble free miles and I have changed car to a Volvo S60 D3. I'm looking forward to fitting the Chip Express unit and reaping the rewards, thanks guys!”


Frazer from Skirlaugh

Vauxhall Insignia MK1 2.0 CDTI ecoFLEX 130

“Many thanks for your fantastic service! Unit ordered Sunday, delivered Tuesday am!! Unit now fitted and, as promised, the car is transformed. Winding country lanes tackled quite happily in fifth gear. Cruising on much smaller throttle openings and immediate response on acceleration. The car behaves as a mini car should behave. I had some initial doubts about spending quite a large amount of money on this item but it is worth every penny and would not hesitate to advise anyone to do similar.”


Alan from Coventry

Suzuki Swift 1.3 DDIS 75

“I must say l'm delighted with the improvement from your chip, its on the standard settings and the difference in the car is amazing!!! I have a smile on my face every time I get in the car, and there is about 5-7mpg improvement. With the mileage l do, l can see myself getting my money back in no time at all. So if your a doubter like me, don't be because its one of the best things l've ever bought!!!”


Ian from Manchester

Audi A6 MK4 3.0 BiTDI 313