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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N55 Turbo Engine Tuning and Exhaust Modifications - 335i Tuning > Possible automatic transmission slip



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      11-17-2019, 12:10 PM   #1
Shawnalston10
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Possible automatic transmission slip

Usually on cold starts when I start to drive occasionally my 2nd gear will Rev a little higher before it shifts and I think it has done it on 3rd gear too. Is this transmission slip or something else and has anyone else experienced this? My car is a 2011 335i
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      11-17-2019, 01:32 PM   #2
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Quote:
Originally Posted by Shawnalston10 View Post
Usually on cold starts when I start to drive occasionally my 2nd gear will Rev a little higher before it shifts and I think it has done it on 3rd gear too. Is this transmission slip or something else and has anyone else experienced this? My car is a 2011 335i
I remember reading about how the car will do that when cold to warm it up a bit faster. But I'm not 100% sure. Mine does it in 2nd while driving out of the neighborhood when it's really cold outside.
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      11-21-2019, 09:28 AM   #3
Jwallace410
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Yea man, I had the same "issue" when I bought my e93. My searches on these forums found it's basically due to software in the trans, which is standard and common. Not an problem.

I had to flash my trans with" xHP stage 2" for my custom tune and the "slipping/over rev" is gone. All my other shifts are firm and precise when going WOT, but super smooth when slow poking around town.
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      11-22-2019, 12:10 AM   #4
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Normally this transmission locks the torque converter as soon as possible but it has a special cold start routine that allows extra slippage to help warm up the fluid.
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