Quote Originally Posted by FieryRobot View Post
But you can add a wastegate to a supercharger, no? Especially a centrifugal one.
Technically, yes, you could setup a supercharger system with a wastegate (or some sort of precision bypass valve) on the intake somewhere after the supercharger. Then you could use a smaller pulley wheel to over-spin the supercharger some, while relying on the wastegate/bypass to limit boost. With a centrifugal supercharger, this would give you peak boost before redline, then hold peak boost up to redline. With other types of superchargers, it would just over-work the supercharger constantly unless you drove up to a higher elevation.

The big difference between this idea and how a wastegate fits into a turbo system is that on a turbo, the wastegate limits the speed of the turbo. The wastegate bleeds off exhaust, around the turbine side of the turbo, limiting the turbo speed, and indirectly limiting boost. With the supercharger setup, the wastegate would be directly bleeding off boost pressure, but the supercharger would still be spinning faster than necessary to generate the controlled amount of boost. Faster supercharger = less efficient = more heat.

This variable ratio ProCharger looks pretty cool, though: http://www.lsxtv.com/news/procharger...-supercharger/