1. Health check
Before touching the software, the engine and its supporting systems should be in good health. Faults, worn components or a poor service history can limit the result or be made worse by extra torque.
2. Reading the original software
The ECU's software is read either through the OBD diagnostic port under the dashboard, or, on some vehicles, directly from the ECU on the bench or via boot mode. Tuning tools from manufacturers such as Alientech and Dimsport support this for a very wide range of vehicles.
The original file is saved, which is what makes the process reversible.
3. Modifying the maps
The tuner adjusts the relevant maps for that engine: injection quantity, turbo boost, ignition timing on petrol engines, and the torque and power limits. Changes are kept within safe margins for the engine, and checksums are corrected so the ECU accepts the new file.
4. Writing the file back
The modified file is written to the ECU. This normally takes a short time, during which the vehicle should not be disturbed.
5. Testing
Remap Experts remaps are fully dyno tested, so power and torque are measured on a rolling road rather than assumed, and the car is checked for correct running afterwards.
Questions
How long does a remap take?
It depends on the vehicle and the checks involved, but it is typically a matter of hours rather than days. Your local Remap Experts site will confirm when you book.
Do I have to leave the car?
Your local specialist will explain arrangements when you request a quote.