[Tom Vaught]

Originally Posted by Lee

Recently, I tested my friend's TOTALLY stock '79 Trans Am, 403 2.73 gears, 27,xxx miles. It was rated at 180 or 185hp, which I always assumed to be flywheel (since chassis dynos didn't really exist at the time). On our DynoJet, it put 178 to the wheels. That was through the crappy old pellet catalytic converter.

About as accurate as I can state is the RWHP will be about 20% lower than flywheel - but with a +/- range of up to 18% (2% to 38% of flywheel).

Clayton Chassis Twin Roll Dynos have been around from the early 1960s, not 1979. (think Dyno Jet, etc).

Your 18% Trans/Chassis/Tire loss number is "SPOT ON" vs what Ford has used for many years (and verified yearly on the Company Test Tracks).

Tom V.

[Lee]

Originally Posted by Tom Vaught

Clayton Chassis Twin Roll Dynos have been around from the early 1960s, not 1979. (think Dyno Jet, etc).

True, I knew the OEMs had methods of testing. But the general public didn't really have access to them. I know it was in the 90's before I knew of any place where I could use a chassis dyno.

Then it was love at first sight!