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Remapping and "Chip tuning" as it is commonly known, is the art of modifying the standard ECU (Engine Control Unit) software, which is stored in the factory engine management system, otherwise known as the ECU or ECM (Engine Control Module). In order to increase the power-output of the engine, it is important to change the timing and amount of fuelling, ignition timing, and turbo boost on turbocharged engines. By adjusting these parameters, the engine will have the utmost efficient combustion required for power and economy. An increase in power output of about 30% can be achieved, combined with a smoke-free vehicle and improved fuel economy of about 15%.

What is involved?
Normally the original software in the ECM is read first and stored as a file. This file is then modified and then programmed back into the ECM, overwriting the original software. Only the parts of the software essential for improving the performance of the engine are altered. The software is read and programmed to and from the ECM via the OBDII diagnostics port, so there are no physical changes at all. Even if the ECM has to be removed from the car for access, it's normally a non-invasive process of reprogramming the engine computer, known as bench flashing. We do not alter any of the diagnostics systems, or the engine idle running, or any areas which would affect the MOT emissions. This makes our ECM upgrades 100% service compliant, and 100% UK emissions compliant.

How does remapping and chip tuning compare to a tuning box for a diesel engine?
Tuning boxes are add on devices that work by intercepting the signals between the ECU and the sensors and fuel system in the engine. Some tuning boxes intercept sensor signals fooling the ECU into thinking  that the engine is doing  something different to what it actually is, thus making the ECU add more fuel. Other tuning boxes work by intercepting the output signals from the ECU and thus modifying the fuel control. Either way, a tuning box will only increase the amount of fuel that is added. A tuning box has its place on many modern vehicles where it is either not possible to remap or a remap has not been developed. Due to the fact that the tuning box is only ‘skewing’ the fuelling and not increasing turbo pressure, the gains are often significantly less than a remap.