Trust me on this one - I've seen the torque curves. Here in Southern California there is just about every type of hot-rod from supercharged civics to older Porsche 911 Bi-turbos. You see just about every conceiveable piece of machinery out here. And you learn - sometimes the hard way (by getting your but kicked). I can tell you one thing though - no street driven centrifugally supercharged civic, prelude, VR6 Jetta or whatever is EVER going to hang with a chipped 951.
Buying books is a good idea - but you should first look at the scc issue I mentioned. There is a complete write up on the issue of supercharging. I think it might have been even Bosch that did not understand by people centrigally supercharged cars. Apparently the design is more akin to applications involving heavy machinery that tends to only moderately vary rpm.
With a properly tuned 951 you can have 400 ft-lbs of torque at 3500 rpm - the only thing that could come close is roots. If a centrifigul produced this much torque at 3000, the head would fly far, far away from the car by 5000 rpm, let alone 6000 rpm, or even the 7000 rpm of my 951.
The advantage with the turbo is that you can bleed off the exhaust gases through the wastegate above a certain rpm point to compensate for this and to keep the boost constant. In the above centrifugal you may be running 20 psi of boost at 3000 rpm (which is acceptable) and 30-35 psi by 7000 rpm (which is totally unacceptable). The above 1/4 miles times are illustrative. I don't mean to discourage you, but this is free advice.
The solution for the centrifigal is to run a variable speed gearbox so that the unit can act more like a turbo and keep appropriate shaft speeds across the rpm range. I believe there is a company that makes such a unit although I'm not sure of their name. Rototech?
Anyway, Good luck in your search for HP!
Erick
