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Interesting with your runs hoyas490. Its strange that the M550i doesn't perform better than that. I have the impression that all other Bmw models perform better than the official number. And that the difference between the M550i and the M5 competition is over a second to 60mph seems odd. The difference between the M340ix and the M550i should be bigger since the weight difference is rather small but big difference in power and torque. Can it be that there is less torque on the first gear to save the transmission and the chassis?
I divided the numbers from your first run to see if the car is slow at any special speed but its equally fast at all the speeds.
0-10mph 0,66s
10-20mph 0,82s
20-30mph 0,63s
30-40mph 0,56s
40-50mph 0,70s
50-60mph 0,69s
If traction would be a problem the 0-10mph time would be worse. And the gear changes occur at 36mph and 56mph which doesn't seem to affect the acceleration at those speeds.
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