JF Automotive

FAQ's (Frequently Asked Questions)


ECU Remapping is a way of fine tuning the vehicle's 'brain' to make it perform more efficiently. All vehicles have an ECU (Engine Control Unit) and the data file stored on the ECU tells the engine how to run. What we do is simply recalibrate the software on the ECU, either by connecting to the vehicle's OBD (On-Board Diagnostic) port, bench tuning or by adding a plug and play tuning module kit. We can improve a vehicle's fuel economy by up to 15%, or increase power by up to 40% using these methods. Remapping is sometimes known as chip tuning, which is an old method of tuning.

No. All codes and diagnostics that a main dealer might read when a vehicle is in for a service or diagnostics will remain exactly the same. We say it with confidence because of the rigorous testing regime all our remap files go through. In addition to this, EU Block Exemption Regulations it is illegal for a vehicle manufacturer to void your warranty because work has been carried out by a third party. This also covers vehicle tuning and engine remapping as long as the failure is not as a direct cause of the remap. We can say with confidence that no JFA tuning remap has ever caused a single failure and we are recognised as supplying some of the best tuning files in the world. To back this, we offer our customers 100% peace of mind knowing that our tuning files are fully insured for up to £2 million by Aviva.

A Plug and Play tuning module or a custom written OBD remap will usually take between 1-2 hours, depending on the vehicle. However, some vehicles especially those requiring bench tuning can take up to a whole day. Get in contact with us for an idea of how long it will take us to tune your vehicle.

Absolutely. We offer this service free of charge if the vehicle is brought back to us. We'll be very surprised if that's what you want after taking one of our remap products, however in the case of lease cars some customers prefer to put the car back to standard before returning the car. Should you lose your tuning files due to dealer actions or parts failure we will be happy to re-install the map onto your car free of charge where possible.

Whilst the remap is undetectable to dealer equipment, you should notify your insurance company of any modification to your vehicle. Many insurance companies do not penalise you for upgrades of this nature, particularly if you're tuning for increased economy however a failure to disclose modifications may invalidate your policy. You may wish to enquire with your insurer if the modification will affect your policy prior to choosing one of our services.

No. Our remaps are designed specifically to improve the performance of your vehicle whilst remaining within the tolerances of your vehicles' components.
Sadly, in attempt to achieve 'big numbers' some other companies over tune engines, placing excessive stress on the engine, transmission, cooling systems, etc, leading to reduced life span and reliability of the vehicle. We pride ourselves in producing reliable remaps which do not over stress your vehicle but still produce impressive results.

Some existing modifications can improve the gains made by remapping a vehicle, and modifications to parts such as air filters and exhausts reduce restrictions of manufacturer parts. We offer a range of remap packages to cater for a whole host of modifications. If you wish, you can order modifications from us to compliment your map and have them fitted when we remap your vehicle.

No problem, simply bring the vehicle back in and we will take a fresh read of your ECU and write you a new map file free of charge. We offer this as part of our lifetime software support.

ECU remapping is far superior to the diesel tuning boxes. When we remap an ECU it optimises various settings and parameters the ECU controls that a tuning box cannot as diesel tuning boxes can only give more fuel pressure. Here at JF Automotive we do sell tuning boxes for certain applications, but these are high end digital chips that have proven results in the dyno cell. Beware of cheap tuning boxes for sale as these can lead to problems or not have any effect on the vehicles performance at all.

We asked, "Why do some tuners charge as little as £150?" There are a few factors as to why we do not offer remapping for £100-£200!
We supply custom written files for each vehicle that we remap that take in to account idiosyncrasies of each vehicle. Our services are fully insured with a 30-day money back guarantee and lifetime support for the tuning software supplied. We constantly invest in the most up to date tuning and diagnostic equipment and software and we offer a quality service to all our customers. Overall our custom supplied tuning software is of the highest standard that we know of, so if you want the best of the best, choose JF Automotive.

In any case where a customer is dissatisfied with any ecu remap software supplied, within thirty days of the supply date, the customer can request their money back. In order for any refund to be processed, the customer must present their vehicle to our workshop and allow our technicians to restore the vehicle to its original state. On successful completion JF Automotive will refund the cost of the remap to the customer.
No refund can be granted unless the vehicle is returned to the original state by JF Automotive. The 30-day money back guarantee only applies to remaps and does not apply to other services, parts or dyno sessions.
If another modification is purchased alongside a tuning file, which relies on a remap to operate, only the cost of the file is covered by this guarantee. We reserve the right to withdraw this 30 day money back guarantee.

DPF removal is illegal for a vehicle that is used for road use and will invalidate your vehicles MOT. All DPF software or removal work is carried out at the owners risk and intention.

This is one method of tuning a vehicle. It involves physically removing the vehicle's ECU so that we can connect directly to the ECU's circuit board which enables us to re-calibrate the vehicle's ECU before putting everything back as we found it. We can complete all of this in-house. Naturally is takes us a bit longer to tune a vehicle this way but don't worry, we will let you know which method of tuning we will use on your vehicle when you make your initial enquiry.

Stage 1 tune is a software re-calibration only.
Stage 2 tune is software re-calibraited to work with light engine modifications e.g Air Filter, exhaust, intercooler.
Stage 3 tune is software re-calibrated on the dyno for heavy engine modifications e.g Cold air intake, exhaust, intercooler, turbo upgrade and more.

JF Automotive insignia