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      10-27-2020, 09:49 AM   #1
zenohua
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DCT deceleration sudden surge/jerk/lurch

Just curious if anyone had the similar problem when car is in Sequential manual setting, coasting/light braking to a stop, the car lurch forward like someone hit you in the rear.
It particular happens when you leave the gearbox in 5th gear, the DCT gearbox will downshift itself from 5th to 2nd while approaching to a stop.
It's so frustrating as the car got this problem on either factory, latest DCT software or GTS software.
Cheers.
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      10-27-2020, 10:38 AM   #2
jiggz
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Quote:
Originally Posted by zenohua View Post
Just curious if anyone had the similar problem when car is in Sequential manual setting, coasting/light braking to a stop, the car lurch forward like someone hit you in the rear.
It particular happens when you leave the gearbox in 5th gear, the DCT gearbox will downshift itself from 5th to 2nd while approaching to a stop.
It's so frustrating as the car got this problem on either factory, latest DCT software or GTS software.
Cheers.
It's normal.

Did you see this thread?
https://www.m3post.com/forums/showthread.php?t=1418410

Within the above thread you'll find tons of useful links, including one on 'DCT slow speed behavior' -
https://www.m3post.com/forums/showthread.php?t=1091635
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      10-27-2020, 07:37 PM   #3
zenohua
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Quote:
Originally Posted by jiggz View Post
Quote:
Originally Posted by zenohua View Post
Just curious if anyone had the similar problem when car is in Sequential manual setting, coasting/light braking to a stop, the car lurch forward like someone hit you in the rear.
It particular happens when you leave the gearbox in 5th gear, the DCT gearbox will downshift itself from 5th to 2nd while approaching to a stop.
It's so frustrating as the car got this problem on either factory, latest DCT software or GTS software.
Cheers.
It's normal.

Did you see this thread?
https://www.m3post.com/forums/showthread.php?t=1418410

Within the above thread you'll find tons of useful links, including one on 'DCT slow speed behavior' -
https://www.m3post.com/forums/showthread.php?t=1091635
Thanks for the reply, I have searched for the issue for years and no one have a real solution to solve it. It's the same symptom in these posts https://www.m3post.com/forums/showthread.php?t=431349
and
https://www.m3post.com/forums/showthread.php?t=825086

I had this car for 4 years and this is the only complaint I had for dct gearbox, guess I have to live with it and avoid let the car downshift from 5th gear.
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      10-28-2020, 07:07 AM   #4
amrazM
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drive in setting d4 so it will always downshift all the gears
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2011 Frozen Black/Fox Red E90 M3 650+WHP

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First DCT to Manual Conversion Worldwide
KW CS, BBS RI-A, BW Headers, Snow 2.5
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