Quote:
Originally Posted by kyoo
does anyone have any links on the oem rear differential, and how it works/is electronically controlled, with the various levels of traction control on/off?
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I know this isn't really what you're asking, but I figured I'd include it as a fun info tidbit for everyone
Here's a thread from the coding subforum that shows how traction control is calculated between different models - specifically post #8 (and refer back to post #1)
https://www.m3post.com/forums/showth...light=euro+mdm
I will summarize shortly here:
There is some sort of equation that isn't known to non-BMW engineers, but what we do know is that the car is measuring coefficient of friction in some way and there are values assigned to each chassis as to when to engage traction control.
For M3_UEBERSTEUERN_MUE_1_2_M:
wert_00: !(E90+(S65B40+US,S65B44+!US+MAN_UMF_GTS),(E92,E93) +S65B40)
wert_01: E90 + S65B40 + US
wert_02: E92 + S65B40 + !US + !MAN_UMF_GTS
wert_03: E92 + S65B40 + US
wert_04: E93 + S65B40 + !US
wert_05: E93 + S65B40 + US
wert_06: E92 + S65B40 + !US + MAN_UMF_GTS
wert_07: E90 + S65B44 + !US + MAN_UMF_GTS
Here are the coefficient of friction that are associated with each value:
wert_00: 2.5
wert_01: 4.09375
wert_02: 2.09375
wert_03: 3.296875
wert_04: 3.09375
wert_05: 4.484375
wert_06: 2.09375
wert_07: 2.09375
It was interesting to me just how much the US E93 got shafted on traction control compared to Euro E92