The results are in!

270 RWHP
310 RWTQ

This was on a Dyno Dynamics Dynamometer. The guy running the drno told me that this dyno tends to run a little on the light side and I should add another 10-15 hp to get a number comparable to a Dynojet.


My dad put his 455 Hurst/Olds up on the dyno. It had major air fuel problems and was so rich the wideband O2 sensor couldnt read it. First pull with 80 jets in the front and 78 jets in the rear, blowing black smoke netted him 235 RWHP.

The second pull with 76 jets front and rear got him 250 RWHP and a air fuel of 10.5

The third pull with 72 jets got him a 260 RWHP and a air fuel of 11.

With a bit more tuning, and the air fuel at 13.5 he should be up over 300 RWHP.


Here is a shot of my graph... what do you think?

Looks about right for intake/catback and a tune. Was your cutout open or closed?

I tried it open and closed, made no difference in power, just noise level.

How much flywheel horsepower would I have? What is the conversion factor for a M6 car?

Roughly 15% loss through an M6 drivetrain. Sometimes more, sometimes less. Assuming 15%, I come up with 318 bhp, but I would not go around quoting that figure like it's the truth. You can safely say "over 300hp." Anything less than 10% drivetrain loss is pretty much unheard of.

The only thing that really matters is how much you're putting to the ground.