In Reply to: Calculations (more) posted by marc b on July 26, 2000 at 17:18:05:
Overall, it looks like a Vortec supercharger running ~6psi of boost (The most that is safe without an aftercooler) would give you about 420hp @8000 rpm with a peak torque of ~310ft-lbs around 5000rpm, 0-60 would be around 4.4-4.5 or so, and 1/4 around 12.7 or so. if you ran a turbo, you would probably be able to get 250ft-lbs at 2500rpm, 350-400ft-lbs between 4&5000rpm, but dropping rapidly to 250-260 by redline, so peak hp would be about the same ~420-440 (that would be running 8-10psi of boost)
The problem is, because the rev range is so high, its tought to find a single turbo that can spool fast enough to give you the low-end grunt, but still manage the volume of air near redline (you run in the problems Audi turbos have, where the torque drops by 30+% between 4500 and 6500rpm)
Just some thoughts,
if anyone wants to host the graphs, I can email them out
Hey what's everyones feeling on installing a turbo or supercharger on a M3?