All modern cars use a computer (Electronic control unit) to run the engine. The ECU has a set of calibrations from the factory which can be altered/changed to get the most from your car in terms of performance, economy and improve your overall driving experience. This helps you to save money on your fuel costs over the years of ownership. While tuning a car for optimal performance may sound complicated to many, well it is not. Remapping / ECU tuning is when the settings of a car’s ECU is altered to improve several areas of the vehicle’s performance. By overwriting the existing calibration with a new calibration, the tuner can re-programme the ECU to manage the fuel injection, airflow, Spark Ignition etc., (within legal limitations).