Since the early 1990s, most engines have been controlled by an on-board computer - the engine control unit (ECU). The ECU determines ignition timing, fuelling and boost pressure for all given engine speeds and loads. ECU mapping, however, allows the way the engine is controlled to be changed, thus helping you achieve an engine setting that matches your particular needs. Engine tuning for both petrol and diesel engines change your driving experience because they remove the limits that exist on normal car engines. Indeed, even your vehicle’s planned performance is restricted because most car manufacturers are forced to allow for vehicle owners who do not adhere to service schedules or who use sub-standard fuels. An ECU superchip will allow you to get the very best from your car and drive far beyond the limits set by its manufacturer.