Originally posted by igo4bmx
i understand what ur saying, but im trying to figure out why an engine that sees 9psi of pressure would have different HP numbers just based on how the 9psi was made?u know what i mean?
Well it depends on efficiency. A turbo running at 9psi at 80% efficiency will make more power than a turbo running at 9psi at 50% efficiency. This is the reason why turbos generally make more power than SC's, they are just a more efficient air pump. This is also why centerfugal SC's generally make more power than roots types, they are more efficient--they don't have to work as hard to make optimal boost levels, which in the case of the supercharger, means less parasitic loss also.