Originally Posted by turbo8765
Actually, given the difference in weight and the advantage of the DCT, the delta seems appropriate.
There have been references in numerous threads to drag racing calculators. They've been used to quote power numbers for the F10. The drag calculators are more realistic for something like a 4L60E than a modern 7spd DCT. The 7spd DCT is an incredible tool and really optimizes the performance for a given power level. Hence the very strong trap speed for the given power:weight for the bimmer.
I don't like these testers either... seems like someone consumer reports should hire.
The M5 is only lighter by 142lbs , whereas the dyno showed 30+whp and 50+wtq advantages. Yes, the DCT is a more efficient set up and quicker. But the AWD on the E63 S also helps it efficiently put power to the ground. We are talking wheel hp where the parasitic loss from the AWD is already being factored in so the E63 S's 540awhp is already being impacted by that. So the AWD and DCT advantages are kind of cancelling each out. Lieberman alludea to the fact that BMW's are more finicky on a dyno. Like I said, the way the M5 is performing is much closer to 540whp than to 500whp.