Quote:
Originally Posted by nonicname
can someone explain to me why SC are making less power with the same boost than turbos?
I guess it's because the SC takes energy from the engine to create more energy?
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Yes, a supercharger will have inherently greater parasitic losses then a turbocharger. Positive displacement superchargers would again still have greater parasitic loses then a centrifugal supercharger. That said, compressor outlet temps would typically be the lowest out of a twin screw PD configuration for a few reasons, with turbochargers having the highest exducer temps. There is no physical contact between the screws, and the screw speeds are about 1/3rd of what they would be in a centrifugal or turbocharger's compressor. It has been mentioned previously, but another major advantage is due to the nature of how a twin screw moves/compresses air, it builds boost virtually instantly making your engine feel like it has more displacement. Positive displacement superchargers are not load dependent like a turbocharger or completely RPM dependent like a centrifugal.
All of that said, turbocharging, centrifugal and twin screw froms of mechanical forced induction are all viable options. There are several excellent kits on the market to chose from; it most important to remember then the best system is the one that will accomplish your specific goals.