01-09-2019, 01:36 PM | #1 |
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m235i rwd zf8 full auto mode hits limiter occasionally
On my way to work this morning the tranny hit the rev limiter (or at least that's what it felt like it was doing) when I floored it on the highway. It kicked down, went all the way through 2nd gear, then at the top of 2nd it felt like it hit the limiter and didn't upshift. It was weird. It then did it again later.
It's in sport+, transmission to the left in "S" but I never touched the paddles so it never went manual mode. Any ideas? All I have done so far is stage 1 hex tune. Thanks! |
01-10-2019, 09:59 AM | #3 | |
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01-10-2019, 12:44 PM | #5 |
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How long after you started the cold car did you start going full throttle? Assuming the car is parked somewhere where temps are below 60 degrees and it's a stone cold start, it takes a ~15 minutes of driving to get engine oil, transmission fluid, and differential oils up to temp. Coolant warms up much faster, but transmission and engine oil take far longer and are much more important. Most automatics will have abrupt shifting, delayed shifting, and weird characteristics if you hammer on them while the fluid is cold. FYI, automatic transmission fluid expands 10-15% when at temp and the transmission depends on this expansion for optimal performance and shifting.
It is very wise to not drive hard until the car is up to full operating temp, ESPECIALLY the transmission fluid and engine oil. Lastly, you'd likely get better response on the M2 forum as you've got a DCT and the M235/M240 have planetary automatics. Your Hex tune could also be playing havoc with the torque management system as the transmission computer is trying to figure out why the torque values are so high in comparison to what it's expecting.
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01-10-2019, 01:42 PM | #6 |
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No i have the ZF8 in my m235i. I don't have my M2 anymore.
This happened on the highway a good half hour into my drive so everything was up to temperature |
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