That's not turbo lag, IMHO. My M3 does something very similar. I believe the transmission slips the clutch a bit so as not to shock the driveline too much.
Quote:
The biggest disappointment with the M5 is turbo lag.
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Case in point, drive at highway speeds, and the transmission is in seventh gear. Floor the throttle and you get a fairly quick downshift into third: revs in the top half of the tach, all is well. The problem is that there's no boost, so you get a clutch engagement, followed by no power for a second, followed by massive thrust. Boost should have been built by the time the downshift was done.
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