dynojet conversion factor?

This is a quick question I hope sombody can answer I am wondering if anybody knows howmuch power is lost through the drivetrain since most HP and Torque rating are given at the flywheel. On FWD VW we found a 22% loss (figured this out by running the motor on the engine dyno then in the car on the dynojet, and verifying it on the dynojet with the negitive HP feature) so if anybody knows wat the percentage is it would help me out. Thanks in advance