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      03-04-2020, 05:48 PM   #1
Marvins
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Drexler Differential Upgrade issues F82 M4 CS

Guten Tag! First post!

Just to make people aware before hand, I am not new to coding but this one has me hitting a bit of a brick wall. ��

So, I’m Currently working on a friends 2018 F82 M4 CS and the differential has been upgraded to a Drexler LSD.

Here’s where the fun begins... It no longer utilises or uses the servotronic motor which was apart of the original differential, which means there is no where for it to go, but that doesn’t mean to say it doesn’t need connecting... or does it?

Anyway... if I disconnect the GHAS I only get a DSC/ABS Error for communication with GHAS as a fault code.

GHAS connected and the car has fault codes for servotronic errors and communication as well as the DSC.

However, the car in drive mode and reverse will barely move a couple of inches under its own power, even with the servotronic plugged in. (DCT)

An honestly is sounds like the differential build has been messed up because the right rear wheel spins off the floor on a lift but the left one doesn’t at all, along with a grinding noise from the right as if the diff isn’t built properly.

Does anyone know if this is normal or am I doing something fundamentally wrong here?

Last edited by Marvins; 03-04-2020 at 06:03 PM..
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      03-05-2020, 04:34 AM   #2
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Bump, someone must know something?
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      03-05-2020, 04:49 AM   #3
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Quote:
Originally Posted by Marvins View Post
Bump, someone must know something?
There's a guy in the GTS section who is making a straight up racecar and he replaced the diff. He would probably know
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      03-05-2020, 04:51 AM   #4
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YMS
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      03-05-2020, 10:24 AM   #5
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Quote:
Originally Posted by behindthen0thing View Post
There's a guy in the GTS section who is making a straight up racecar and he replaced the diff. He would probably know
Thank you for the tag!

It's my suspicion that the differential hasn't been built properly because the car will not drive more than an inch and as far as I'm aware, it should drive even with the error codes shown before being flashed as many just disconnect the GHAS module.

This alone i need confirmation of and also what the flash/coding is because I can not for the life of me find it anywhere on the web that even remotely references it
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      03-05-2020, 10:36 AM   #6
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Let us know what the solution is
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      03-05-2020, 02:22 PM   #7
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Contact Mike@BPMSport if you need professional, advanced-level coding assistance. Well worth any price he charges.
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      03-08-2020, 12:20 AM   #8
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The diff have clutch plates like dct gearbox, if clutches worn out it slip. I opened a differential and i know how it is working.
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      03-11-2020, 03:26 PM   #9
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The road so far on this issue if anyone is wanting to know....

https://f87.bimmerpost.com/forums/sh...5#post25913605
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      03-11-2020, 04:14 PM   #10
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Quote:
Originally Posted by Marvins View Post
The road so far on this issue if anyone is wanting to know....

https://f87.bimmerpost.com/forums/sh...5#post25913605
Thanks for the update
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      03-12-2020, 09:35 AM   #11
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How much problems you need to have to modify a good diferential with nice servomotor blocking all time when you use more power with a piece to block it all time:-?
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      02-17-2021, 09:45 PM   #12
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A lot of end users are having the same trouble. There's a coder who's well known in the UK M Car scene who sorted it for us.

Here's his page

Www.facebook.com/zedcoding
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