drivetrain loss %
Le Mans Master
Joined: Jul 2005
Posts: 5,328
Likes: 405
Originally Posted by jogar80
Thats what I always thought but someone told me to use 12% for manual. Just checkin
Thread Starter
Melting Slicks
Joined: May 2005
Posts: 2,231
Likes: 0
From: Brownsville Tx
LOL... Yea I think thats probably the most accurate way to measure HP. That being the case, I just got off the dyno and my car pulled 750 RWHP...with just headers and intake!!
Originally Posted by glass slipper
The C5/6 manual drivetrain is ~12-12.3% on average for a stock engine, you were told correctly. But you'll never know the exact % until you remove the engine and put it on a dyno, but then you'll know FWHP which is what you're after. To use one number to cover all cars is ignorant. As an example, there are FWD drivetrains that have less than 10% loss. They have helical gears for the final drive which have significantly less sliding action/friction than the hypoid gears in RWD cars like our 'Vettes. Chassis dynos are more for tuning than bragging rights, but there are people that will back calculate using the 15% number to inflate the HP...especially the high HP guys where the factor drops to 10-11%. If you just want to brag about engine HP, skip the chassis dyno and just make up a number. It's much cheaper and just as accurate.
