David Neibert
SCCoA Admin
David, what do you think 425-445 RWHP would = in a 5 speed?
550HP @ 14% drivetrain loss = 473
550HP @ 20% drivetrain loss = 440
Just a guess at losses. You probably have more than that, but Ira was on stock SC wheels with some aluminum in his drivetrain.
Micah,
For the sake of this discussion, lets assume the 5 speed has 15% loss and the automatic has 20%. Don't know if it's accurate, but I hear those numbers thrown around a lot. Lets also assume that Ira pulled 475 because Dave didn't detune it and I pulled 425 because I didn't try to over boost it and hit the knock sensor.
475 rwhp divided by .85 = 558.8 HP at the crank
425 rwhp divided by .80 = 531.2 HP at the crank
Lets take it a step further and figure another 5% loss for the unlocked converter.
425 rwhp divided by .75 = 566.6 HP at the crank
If you believe those drive train losses, 425 rwhp from an unlocked AOD looks very close to 475 rwhp from a 5 speed. That would be nice and comforting for some people, but I guess I'm just have difficulty believing that the unlocked AOD is consuming 10% more power than a 5 speed.
David