N55 upshifts, RPM goes down then up 200rpm suddenly after XHP Stage 3

04-20-2024, 02:06 PM	#1
minulache Private First Class 65 Rep 139 Posts Drives: BMW 4 F36 & E92 N55 LCI Join Date: Jun 2023 Location: Bucharest iTrader: (0)	N55 upshifts, RPM goes down then up 200rpm suddenly after XHP Stage 3 Hi guys, I noticed something after doing XHP Stage 3 on my ZF6HP transmission N55 E92. Attached video. When it upshifts, the RPM's drop normally then suddenly increase with 200rpm, but it's only on the tacho. In the car and the sound of the engine, everything is normal. Any idea what could cause this? https://youtube.com/shorts/LthSwwHVuC0?feature=share
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