KraftWerks Supercharger Rotrex C15-60The Rotrex C15 60 supercharger is the largest of the compact C15 line of Rotrex superchargers. This little unit is capable of producing up to 200hp or more on high efficiency engines, on engine sizes ranging between 1. 0 2. 0L. Using the patented Rotrex planetary traction drive, the C15 60 has a 12. 67: 1 drive ratio and can achieve impeller speeds up to 150,000RPM! Supercharger Head Units; 12: 67: 1 Drive Ratio;