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Old 06-17-2012, 08:52 AM
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Originally Posted by dunderhi View Post
Using a calculator at Wallace Racing I get the following:
1) M5, 114.6mph and 4137lbs yields 512hp. (data from MotorTrend)
2) 550, 106.9mph and 4354lbs yields 437hp. (data from MotorTrend)
3) RajG, 110.6mph and 4550lbs yields 506hp. (from RajG's data above)
4) Me, 112.9mph and 4760lbs yields 563hp. (my best trap speed & measured weight)

I suspect BMW's stock numbers are in general underestimated, but I believe BMW quotes minimum performance numbers since manufacturing variances will produce engines with different power levels; every engine does not leave the factory with the exact same horsepower.
Good info. There have been very few tests on the 550, but there have been tests on the 650 and 750 both of which weight at least as much as the 550 (not counting the AWD extra weight). Also, I gave the benefit of the doubt, the stage III package should be 510 hp, right? Also, the 580(?) lb ft of toque with the AWD should make it a monster getting it out of the hole and up to speed, although peak HP is more telling on the trap speed.
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