Stevie28

The way i understand it (and i am a layman!) is that the manufacturer of a car chooses a happy medium for the way the engine will run, i.e so in all conditions, climates, extending service intervals, response required from a wide range of drivers etc. There is a program that controls the engine, this can be altered either by a whole new chip, or by adjusting the existing program with a serial interface. The idea would be to put the car on a rolling road, and tweek the settings to maximise power etc, correct other aspects of the power delivery, you can also adjust settings such as when the rev limiter works, i.e. if the factory setting is restricted fuel once 6800 revs are achieved it could be altered to restrict fuel at 7000 revs, im sure there are others out there could give a more lucid explanation! Certainly i think new chips for naturally aspirated cars are rare, but they can be re-mapped to good effect.... Im hoping someone will work on a new map for the 1.8 mpi 159 engine.....