11-29-2018, 03:35 PM | #1 |
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Struggling to get into 2nd gear at autocross - Need help
My M2 is doing something funky, and I have no idea what to do about it.
On the 1st to 2nd shift, the gate into 2nd gear is sometimes blocked off preventing the shift to 2nd. It happens more frequently while shifting in a turn, but still sometimes happens in a straight. Short shifting seems to help most of the time, but that costs time on the clock. It's happened to every person who's driven my car. I took the car to the dealership, but since it's practically impossible to replicate the problem on the street, they said the car is fine. But it's not. Any guidance would be greatly appreciated. David |
11-29-2018, 03:43 PM | #2 |
Colonel
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Weird.. Only car I've experience that on is my challenger, which actually has a 2nd gear lockout "feature" to improve fuel mileage.. Pretty sure the M2 doesn't have that.
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11-29-2018, 09:00 PM | #3 |
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I have the same problem going from 3rd to 2nd. It happens often as approaching a turn at speed. I believe I've also had the same problem going from 1st to 2nd.
I know I'm not the only one either since I've commented on a post about this before on here. |
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11-29-2018, 09:32 PM | #4 |
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If it's happening going into or out a turn it's most likely deflection on your mounts and bushings. I have trouble getting into gears at exits with harder acceleration at The Ridge race track. Fixed this with harder tranny mount and diff bushing inserts.
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01-02-2019, 01:01 PM | #6 |
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100% this is mainly due to transmission bushings and shifter carrier bushings. Move to a street poly or race poly...
You also shouldn't upgrade transmission bushings without upgrading motor mounts. Id look to put street poly in your engine mounts, transmission mounts, and shifter carrier. Then it's a downward slope to wanting stiffer differential bushings... The gs6-45bz and gs6-53bz ZF transmission never had a good 2nd gear either... it has been notchy on ever bmw since mid 2000's when they started using them... Makes a good drag time difficult when you can't power shift into 2nd. Last edited by bbnks2; 01-03-2019 at 07:28 AM.. |
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01-13-2019, 03:34 PM | #9 | |
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Quote:
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01-14-2019, 03:46 PM | #10 |
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I’ve never encountered this problem. What I have noticed is that I occasionally need to execute a 2->3 shift while autocrossing, and the linkage doesn’t like to be rushed. While the gearchange is sublimely smooth and precise in street driving, one can’t be in too much of a hurry.
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