I was told once (not sure if I believe it) by a Dynojet operater that he could figure out how much drivetrain loss there is by some program on the dynojet. It would let the rollers coast to a stop, and by comparing that with how fast it does it without a car on it, it can figure out drivetrain loss. I didn't beleive him, since I have never seen or heard of it being done. Also that would not take into effect the flywheel/pressure plate and damper.
Just thought I would share
