[scottred.f32]

I have a 2014 435I x drive. Recently when I do a launch or use launch control I get the rear wheels spinning but front stay still. Will also get a stabilization warning and put in to comfort mode. No codes. First BMW so any help will be greatly appreciated.

FBO, custom tune, xhp stage 3

[thejeremyman9]

I assume you are not running Xdelete?

It sounds like potentially a T-case issue. Any active or shadow codes?

How many times have you launched the car - a few, dozens, or hundreds?

[scottred.f32]

No Xdelete, No active or shadow codes, Launched dozens not hundreds, does have 70k on it now bought stock w 50k.

[thejeremyman9]

Originally Posted by scottred.f32

No Xdelete, No active or shadow codes, Launched dozens not hundreds, does have 70k on it now bought stock w 50k.

Well the T-case is what is doing the F/R torque split, so that's where i would suspect the issue is, unless perhaps you have an issue with the front axles or something, but i imagine you would hear/know that. Can you the car in the air and just give everything a once over?

I am honestly not sure if there is some ISTA or procedure to "test" the T-case; i imagine there has to be. Might need to do some research on that.

Does it basically seem like you are RWD all the time? Was there a time when it used to launch fine, then all the sudden it did not?

[scottred.f32]

Only feels like it under hard acceleration will swing in a corner w hard accel. Was no quick on off type feeling or like something broke. I dont launch all the time but I do drive hard. It does spin every time now when launch. Makes it hard to beat those trackhawks!

[f30al]

Did you ever figure this out? I’m having this issue with my 340i xDrive