09-23-2019, 09:39 PM | #1 |
Lieutenant
70
Rep 439
Posts
Drives: 2016 M235i Xdrive 8A
Join Date: Oct 2018
Location: 20036
|
Tranny bump or thud on early gear shifts
2016 F22 M235i Xdrive 8A
18x8 225/40/18 on front 18x9 255/35/18 on rear 57500 miles on car Stock motor with stage 0+ bm3 tunefile Car in comfort or sport driving mode Tranny in sport side with manual shift engaged When I get on the throttle hard it seems like the 1-2 2-3 3-4 shifts are awkward and delayed. The tranny makes a deep thud low pitch bumping sound when it shifts that it doesn't seem to make when its shifting up in the higher gears. Its not egregious but I would say there is a .25 or .5 second delay that isn't there in the upper gears or at other times. Im worried to do bolt ons and tune and force another 150 foot pounds of torque through the drive train?
__________________
SOLD 23K Black 2013 F30 335XI 8A Msport | BMS Intake | BMS Front Mount | VRSF Charge Pipe | BM3 Tune
2016 F22 M235 8A HK NBTevo | CTS HEX Intake | CTS Chargepipe | Gplus Intercooler | VRSF DP | BM3 Stage 2+ | 18" CSL Replicas | XHP X-Delete |
09-24-2019, 09:32 PM | #2 |
Second Lieutenant
132
Rep 237
Posts |
Can you make out the issue on video, and if so can you post one? I would suggest checking the fluid level and scanning the TCU for any pending codes first
|
Appreciate
1
OldCrow7xx69.50 |
09-25-2019, 12:03 PM | #3 |
Enlisted Member
5
Rep 30
Posts |
Does it do this in automatic shifting mode too? If not it could just be your shift points. If it's doing this in automatic mode the first thing you should do is change your transmission fluid. The 'lifetime fluid' BMW states is BS.
It could also be your transfer case. I had a similar issue where I was getting a pretty bad shudder in the same conditions you described @50k miles. All I did was change the transfer case fluid and it completely solved my issue. |
Appreciate
1
OldCrow7xx69.50 |
09-26-2019, 12:51 PM | #4 | |
Lieutenant
70
Rep 439
Posts
Drives: 2016 M235i Xdrive 8A
Join Date: Oct 2018
Location: 20036
|
Quote:
Had the same setup in the 335m sport and it never seemed to do this. Thanks
__________________
SOLD 23K Black 2013 F30 335XI 8A Msport | BMS Intake | BMS Front Mount | VRSF Charge Pipe | BM3 Tune
2016 F22 M235 8A HK NBTevo | CTS HEX Intake | CTS Chargepipe | Gplus Intercooler | VRSF DP | BM3 Stage 2+ | 18" CSL Replicas | XHP X-Delete |
|
Appreciate
0
|
11-05-2019, 04:41 AM | #5 |
DisplacementReplacement
381
Rep 1,085
Posts |
Really don't hear about too many ZF problems so keep us updated and good luck.
__________________
2020 X3M /// MHD Tune
Prior Bimmers 2017 240XI Hybrid / FBO / MHD E40 2015 235XI FBO / MHD E30 2009 335XI FBO / COBB / E30 |
Appreciate
1
OldCrow7xx69.50 |
11-05-2019, 05:50 AM | #6 |
Major General
3069
Rep 5,577
Posts |
And a bad battery is notorious for screwing with automatic transmissions. But this scenario above may be too selective w/auto-manual
|
Appreciate
1
OldCrow7xx69.50 |
11-19-2019, 12:15 AM | #7 | |
Lieutenant
70
Rep 439
Posts
Drives: 2016 M235i Xdrive 8A
Join Date: Oct 2018
Location: 20036
|
I am going to try the transfer case fluid and see if it restores. Car seems very stable over the past couple months of very very spirited driving lol I guess if something was trending towards failure it would have already, but I am no expert on this stuff yet.
Cheers Quote:
__________________
SOLD 23K Black 2013 F30 335XI 8A Msport | BMS Intake | BMS Front Mount | VRSF Charge Pipe | BM3 Tune
2016 F22 M235 8A HK NBTevo | CTS HEX Intake | CTS Chargepipe | Gplus Intercooler | VRSF DP | BM3 Stage 2+ | 18" CSL Replicas | XHP X-Delete |
|
Appreciate
0
|
Post Reply |
Bookmarks |
Thread Tools | Search this Thread |
|
|