Vehicle or car ECU remapping is a change, modification of the internal combustion engine or modification to its control unit, otherwise identified as its ECU (Engine Control Unit). It is performed to yield optimal performance, to increase an engine’s power output, economy, or durability. These goals may be mutually exclusive, and an engine may be detuned with respect to output (work) in exchange for improved economy or longer engine life due to lessened stress on engine components.
It has an extensive history, almost as long as the development of the automobile in general, originating with the development of early racing cars, and after, with the post-war hot road movement. Remapping can describe a wide variety of adjustments and modifications, from the routine adjustment of the carburetor and ignition system to significant engine overhauls. At the other end of the scale, performance remapping of an engine can involve revisiting some of the design decisions taken at quite an early stage in the development of the engine.
Setting the idle speed, fuel/air mixture, carburetor balance, spark plug and distributor point gaps, and ignition timing were regular maintenance items for all older engines and the final but essential steps in setting up a racing engine. On current engines, equipped with electronic ignition and fuel injection, some or all of these tasks are automated, although they still require periodic calibration.
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