Questions about remapping and our file service.

Your engine's control unit (the ECU) runs software that sets how much fuel, boost and ignition timing the engine gets. Carmakers set it to suit many countries, fuels and climates, so most engines have some room left. A remap adjusts that calibration, for more power and torque, smoother delivery or better economy, depending on the service you choose. Nothing is bolted on, and the car looks the same.

A remap changes how the engine is run, so who does it, and the condition of the car, matter. We check the car over before we touch its software, keep a copy of the original file, and set the calibration for the parts the car has. If the check finds a fault, we sort that out with you first, before any tuning.

It depends on your engine, and we tell you what's typical for it when we quote. Turbocharged engines usually have more to give than non-turbo ones, and the car's condition matters too. We don't promise a number we haven't measured. Our power check shows the Stage 1 figures by engine.

Stage 1 is a calibration for a standard car, on the parts it already has. Stage 2 is for a car with supporting hardware already fitted, such as an uprated intercooler or intake, with a file matched to those parts. Not sure which suits yours? Send your reg and tell us what's fitted.

It can: an economy remap is set up for smoother delivery and easier cruising, rather than outright power. Fuel use depends on the car, your routes and how you drive as much as on the calibration, so we tell you what's typical for your car and never promise a saving.

Yes, many of them. Automatic and dual-clutch gearboxes, such as DSG, ZF 8HP and S tronic, have their own control unit, and gearbox tuning sets the gear changes up for the engine, standard or remapped. Not every gearbox can be tuned, so send your reg and we'll check yours. A manual gearbox has no software to tune.

A tuning box sits between the engine's sensors and the ECU and changes the signals the ECU reads. A remap changes the calibration inside the ECU itself. If your car has a tuning box fitted, tell us when you send your reg, because it changes the job.

Cars, vans, trucks and more. Petrol and diesel, manual and automatic. Every vehicle and ECU is different, so send your reg and we'll tell you what we can do for yours. For working vans and small fleets, we tune for economy and drivability: see van and fleet remapping.

There's no fixed price: we quote for your exact car, because the price is set by your car and engine, the ECU it uses, the gearbox, the stage you want, the car's condition and any previous modifications. We don't publish a "from" price that might not be yours. Send us your reg on WhatsApp and a tuner replies with a real quote for your car.

Send us your reg on WhatsApp, or type it into the plate on this page and the button opens WhatsApp with it filled in. We reply there with a quote for your car. Prefer to talk? Call us on +44 7777 370040.

At our workshop, Unit 11, Wembley Park Business Centre, North End Road, Wembley HA9 0AS, or with mobile remapping at your home or work, anywhere in London. The same checks either way. Coming to Unit 11? Get directions.

1. Check the car. We check your car over before we touch its software.
2. Read and back up. We read your original file and keep a copy before we start.
3. A file for your car. We prepare a calibration for your engine and gearbox.
4. Write and test. We write the file to the car and test that it runs as it should.
5. Handover. We hand the car back and answer any questions you have.

More on our ECU remapping in London page.

We tell you how long your car will take when we quote, so you can plan your day: it depends on the car and the work. Gearbox and Stage 2 work can take longer.

Not until we know why it's on. We look at the fault first, with diagnostics, and tell you what we found. Once the car is right, we quote for the remap.

Tell us when you send your reg, and who did the work if you know. We look at what's on the car before we quote, so any new file is set up for the car as it is now.

Yes, always. Every vehicle we remap can go back to standard. We keep a copy of your original file before we start, and even without it we can put the factory software back from our own large file database and dealer-level tools. More on back to stock.

Yes. Please tell your insurer about any remap. Insurers treat a remap as a modification, so let yours know before the work is done, not after. How to tell your insurer.

It might: some insurers charge more for a modified car, and some don't. Ask yours before you book, so you know where you stand.

It can: if your car is under a manufacturer or dealer warranty, the provider can turn down claims on parts a remap affects, such as the engine or gearbox. Read your warranty terms before you book, and ask the provider if you're not sure. Questions to ask your dealer.

Yes. A remap doesn't stop a car being serviced anywhere. Tell the dealer or garage the car has been remapped: if they update the engine software during a visit, the update can replace the remap, so ask them first.

A remap doesn't change the MOT test itself: the car still has to pass the same checks as any other car, including the emissions test. We do performance, economy and gearbox tuning only, set up for everyday driving. What the MOT checks.

Yes. We set every remap up for everyday driving: performance, economy and gearbox tuning only. The car still has to pass the same MOT as any other car, including the emissions test, and you should tell your insurer. We keep your original file, so the car can always go back to standard.

Tell the buyer the car has been remapped, or have it put back to standard first. If we remapped it, we kept your original file, so we can always put it back: see back to stock. If you told your insurer about the remap, tell them when it's back to standard too.