Wheel skipping when cornering, E36 trackday car

[tomvd]

Hey,

I have a problem with my E36 328i, it is a track car only. I build it for 1 year and did my first trackday with it recently and had a litte problem.
When I was taking sharp corners, one of the rear wheels seemed like skipping/vibrating/hopping ... idk what it was but it felt really bad or the car.
I assumed the diff was a welded diff but yesterday I opened the diff and it seems like the diff is in good shape. It is a BMW stock LSD (s2.93)
So now I don't know what would have caused the problem... below some pics of the diff
Other info:
Drove with semi slicks, has sports supsention, stock rubbers, faster less tight corners no problem...

If you can help me in any way, thank you!

Tom

diff1.jpg

diff2.jpg

diff3.jpg

[mslevin]

The clutch plates inside the LSD could be damaged, which could cause the wheels to lock unpredictably. Can't really tell without taking the whole unit apart though. What's the age of the diff?

[emoore924]

ASC off?

[John in Houston]

Which wheel was it? Was it the unloaded wheel (usually inside)? Were you trail braking?

[bluptgm3]

Are you running fluid for LSD, Red Line 75W140 for instance with friction modifiers?


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[tomvd]

Thanks for the anwsers,

I don't know what fluid was in the diff, never opened it before...
I will look into opening up the diff, is this a hard job to do?
I don't think it was ASC, felt diffrent
It was the inside rear wheel I think that acted weird, I wasn't trailbraking the problem occured in het second pat of the corner (after the apex)

EDIT: I can try opening up the internals of the diff and take a look inside (clutch disks etc.), do you guys think this might give answers? Its a lot of work tho for just looking

[olemiss540]

Silly question, but are you CERTAIN is wasnt the inside FRONT wheel skipping? My consistently lifts 3-4 inches during cornering and will "bounce" as the vehicles weight distribution starts to correct. Very common on e36's especially with stiffened front sway bars.

[tomvd]

It certainly wasn't the front wheel, tha car also has original sway bars

[JBasham]

Sorry if this is not helpful, but: With stock suspension and bushings, the chassis can roll around a lot. Are your semi-slick tires rubbing the fender or the wheel well liner a little, when the body leans way over in a hard corner and then the chassis shifts back under acceleration off the apex?

It happened to me once when I put slightly larger tires on a sport suspension E21 at the track.

But probably not. Tire rubbing would make loud noise, but it would not make the wheel hop or lose traction.

[joenationwide]

Yeah its probably a worn out diff. Same thing happened to me in my race car. Inside rear wheel would hop exiting tight turns. Got a new diff and now it is butter.

[QuantuM3]

I have the same problem, my inner right would skip going downhill on freeway ramps (right turn)

Thought it was my blown rear right shock but had a feeling it might be my diff as well