Dyno Tuning Tips with Robbie McQueen http://www.wolfems.com Rob talks about the difference between centrifugal and positive displacement superchargers for engine management and fuel injection systems.

This post is not about the specifics of that, but it is about being able to use your ECU to ensure you don’t work the turbo too hard above its efficiency curve.

A lot of high powered turbo cars have too much power in the lower gears. This can actually make the car slower than if it had less power, as the driver needs to spend more time reducing engine power (with his right foot), than getting on with the job of driving.