fsmich

You can toggle on the APR graphs for crank and wheel hp. They seem to be using a 6% drive train loss to calculate the crank hp. (Some charts from the "GTS turbo kits" are misplaced from the original GTS dyno graphs). They claim 554 crank hp/ 523whp on the original GTS graphs for your 93 tune

polobai

6% seems awfully low for loss from crank to tires, no? I was thinking 12% as on most rwd cars (front engine) they estimate between 15-20%. I doubt we lose that much but I didn’t think it was in the single digits...

fsmich

I agree seems low, but it's really an arbitrary number since they are deriving it from their dyno numbers. They use 6 in the GTS charts. Their dyno numbers and Cobb's dyno numbers were similar on my car, as were my 60-130 and 1/4 traps on the 2 tunes.

Nathan_

12% on 911 and 18% on M3 from my experience.

qtr mile, 100-200kph times and 60-130mph times are more important measures IMO