Can someone tell me the formula to convert whp to chp? I have the COBB stage 1 power package, which says 135.2 whp, and 140.1 ft.\tq. Im just curious as to what power that would be crank.
thank you,

Steven

There is no formal conversion formula. Driveline loss is 30-35% depending on the dyno and the power level (the drivetrain loss is not constant and changes as power levels change). The Cobb stage 1 is worth about 180hp at the crank...

thanks Matt.