ECU remapping, also known as ECU tuning or chipping, is the process of modifying the software that controls the engine management system of a vehicle's Electronic Control Unit (ECU) in order to improve its performance. By adjusting parameters such as fuel injection timing, ignition timing, and turbo boost pressure, ECU remapping can increase engine power and torque, improve fuel efficiency, and enhance throttle response. This process is usually carried out by a specialist using specialized equipment and software to reprogram the ECU.