It actually is a great way to limit boost. (and the only way on a eaton/ roots supercharger without replacing the pulley)Originally Posted by dark_rex
A Eaton/ Roots Supercharger incorporates a bypass valve different from what you are thinking of. When you are cruising or at idle, the valve closes to recirculate that air around inside the unit, until it is needed... then opens 100% to send air into the engine when a certain throttle position is reached.
they are probably modifying the TPS signal to control the bypass from opening fully until 1000 miles... quite an interesting strategy.
This must be why the car is underrated from the factory, despite the SAE test standards put into effect to control the misleading power figures. Very interesting...