Here's the answer to this puzzling question. Both DCS and DTC are deactivated at speeds greater than 31 mph in Sport+ mode. Here's why:
According to the 2 Series owners manual (pages 111-114) DSC is deactivated in Sport+ mode and DTC is also deactivated when you are traveling at speeds greater than 31 mph. Based on this I conclude that the e-diff is the only thing that is active on the track since most if not all corners are taken at speeds greater than 31 mph.
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