Originally Posted by e36jakeo
Is the E92 M3 6-speed really geared that tall (73 MPH in 2nd gear, 111 in 3rd!!??). That is tall for a high-revving engine and does not take advantage of the revs. Maybe they are doing that for gas mileage.
The answer to how fast it will accelerate lies in the new Motor Trend magazine:
Porsche 997 Carrera S: HP 355, torque 295 lb ft, weight 3275, 9.23 lbs/HP
0-60 in 4.4, 1/4 mile in 13.0 109.5
Porsche 997 GT3: HP 415, torque 300 lb ft, weight 3235, 7.80 lbs/HP, 0-60 in 3.8, 1/4 mile in 12.1 @ 118 MPH
BMW E92 M3:414 HP, torque 295 lb ft, weight 3483, 8.39 lbs/HP. The power to weight ratio is 9% better than the Carrera S and 7% worse than the GT3. With similar gearing to a GT3 (kinda tall in the 1st three gears), I see no reason the M3 will not fall smack in the middle of these. It will not be able to launch as hard for 0-60 due to less weight in the back, but I think 0-60 in 4.2 -4.3 seconds and 1/4 mile in 12.5 @ 114 is the best guess based upon the Porsche comparison.
Why are you using 3483 lbs for the M3? According to the thread at the top of this board, the car weighs in at 1655 kg (3648 lbs, EU4). If you've subtracted driver weight from the M3's number, you have to do the same for the Porsche cars (which also use EU4 spec; Porsche actually lists weights in both EU and DIN on their site). The GT3 is only 1395 kg/3076 lbs by the standard definition of "curb weight."
Also keep in mind that the RR P-cars have much better traction off the line than any FR, including the M3. The M3's ET will be much closer to the Carrera S (though it'll trap faster) than the GT3, despite the power/weight ratios.