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      10-07-2018, 04:47 PM   #1
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Drives: BMW X6
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BMW X6 Turning causes RPM Jump


I have a tuned BMW X6 35I with catless Downpipes. My questions is this. Whenever I turn left, occasionally the rpm is fluctuating. My usual Idle is 600 RPM. But when I turn left the rpm jumps between 600 and 900. That only happens when you start to drive off and have to make a left turn right away like in a parking lot for example. Turning right does not seem to be a problem. I know your steering pump is working and its normal but I was wondering if having an ECU tune + Catless DP's cause the more abrupt RPM jumps. No codes and the car otherwise seems healthy

P.S. The RPM surge while turning left seems to be only occasional.

Thank you
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      12-04-2018, 06:38 AM   #2
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Drives: BMW X6, MHD Stage 2
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sorry to be off topic
but what brand of catless dps are you running?

Im also tuned but stock cats, I dont think I experience fluctuation of rpms

what i do experience is when doing full turns left or right
there is jerkyness on the transmission

seems like xdrive cannot sort itself
has been like this (before the tune) ever since I could remember
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      12-04-2018, 10:17 AM   #3
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Drives: 2011 X6m, 1991 E30 vert
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Look into failing transfer case. Apparently its not uncommon for them to go out. Its what controls the torque vectoring and xDrive so you will notice it when turning.
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