I know - weird.
Previously I thought I might have possibly lifted early but on the last three runs I did not lift my foot at all until over 90mph but each time there was the wobble on the revs.
In my Merc the engine management kills the revs if there is wheel spin but I doubt the BMW is that sophisticated - or powerful enough to spin the wheels at 80mph despite my modifications.
It is after the gear change, so perhaps the new higher ratio forces the drop? Auto box remember - might be relevent
Any thoughts or theories welcome. It is bugging me now.
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