Help diag this problem on my E30

Lets face it, E30s love going sideways.
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Yoshi
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Help diag this problem on my E30

Postby Yoshi » Mon Jun 22, 2009 5:03 pm

Situation:
Drifting third gear going reverse on the orange loop (which BTW is uber hard), finished the corner and just plain want to go straight. Instead, with the car out of gear and my hands/feet off of EVERYTHING, the car does a series of at minimum 4 but maximum 7 mini switch backs.

The theory zack mentioned to me was that I have solid sway bar links in the front and dead rubber bushings on my sway bar links in the rear. On the front links I got were an "upgrade" and I had no clue how to put them in. Normally they look like this (http://www.realoem.com/bmw/showparts.do ... g=31&fg=10) but The link that I got was just a ball joint and a lot of threading. I just used 2 nuts to get as close as I could do the control arm but they seem to have some play in them regardless. I think when the weight transfers, it clanks then immediately loads the other side. I don't see how this would induce oversteer though. I would think understeer...

other ideas?
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Re: Help diag this problem on my E30

Postby ten2doyle102 » Mon Jun 22, 2009 5:50 pm

Just so I understand since I have no drifting background at all, pretty much when you want to end the drift you should be able to let go of just about everything and it should self adjust? I would understand that with a AWD car, but not a RWD one. I personally would expect the car to do almost what you just described really. Actually, I'd tend to think more that it would just want to spin out actually...

I am only say that because the one time that I had had what you are trying to describe, no matter what, the car didn't want to stop pulling the switch backs. I fought it for about 5-6 times but come the 6th time, I said "f" it and let it go. Pulled a full 360 in the highway and came to a stop. They only thing that comes to mind about that was the fact that the car had a open diff since what was happening was that once sideways, the wheel on the outside of the slide grabbed traction and spun the inside one which then stopping the slide but throwing the weight to the other side of the car forcing a slide that way etc. etc.

So....I guess if possible could it caused by a weak LSD????


Are the stock sways? or aftermarket? Kinda sounds like its having too much weight transfer going on. Thicker sways would help that correct? Again, this is coming from some with minimal experience with this stuff! :)
Last edited by ten2doyle102 on Mon Jun 22, 2009 5:57 pm, edited 1 time in total.
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Re: Help diag this problem on my E30

Postby Yoshi » Mon Jun 22, 2009 5:56 pm

If you let go of everything (in any situation) the car should settle. The fact the car wobbled so much and took THAT long to settle is less than encouraging. I don't think the diff is to blame since it has happened with my 4.10 lsd and 2.93lsd
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Re: Help diag this problem on my E30

Postby ten2doyle102 » Mon Jun 22, 2009 5:57 pm

Ahh ok.

Are they performance sways? or stock?
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Re: Help diag this problem on my E30

Postby Yoshi » Mon Jun 22, 2009 6:03 pm

HR spec E30 sways. Full stiff rear, full soft front IIRC.
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Re: Help diag this problem on my E30

Postby ten2doyle102 » Mon Jun 22, 2009 6:04 pm

Hmm....I really don't know, but I'd like to know for my own knowledge!
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Re: Help diag this problem on my E30

Postby Yoshi » Tue Jun 23, 2009 12:57 am

Here is the video of the problem. 1:08-1:15. You can hear when I get off everything but the car still freaks out. ignore me sucking...

http://vimeo.com/5275929
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Re: Help diag this problem on my E30

Postby Omar » Tue Jun 30, 2009 11:11 am

thats just weird man. i have no idea but do let us know when u figure it out.
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Re: Help diag this problem on my E30

Postby Yoshi » Tue Jun 30, 2009 12:17 pm

I replaced the control arms (ball joints were dead), back to stock sway links (new), new tie rod, THR lollipops. And soon an alignment. Basically I redid the whole front. It should steer like a dream now.
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Re: Help diag this problem on my E30

Postby ten2doyle102 » Tue Jun 30, 2009 12:36 pm

Hopefully that helps! :)
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Re: Help diag this problem on my E30

Postby madmaverick » Tue Sep 29, 2009 4:30 pm

Is your problem gone?

Also, how much tire are you running?
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Re: Help diag this problem on my E30

Postby Yoshi » Tue Sep 29, 2009 6:58 pm

I run 245/45/17s in the back. The problem is totally gone now. I'm an idiot and the links I was using for the sway bars weren't designed for E30s or something. Basically, I always had massive preload and suddenly not mid corner.
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Re: Help diag this problem on my E30

Postby madmaverick » Wed Sep 30, 2009 12:00 pm

Yoshi wrote:I run 245/45/17s in the back. The problem is totally gone now. I'm an idiot and the links I was using for the sway bars weren't designed for E30s or something. Basically, I always had massive preload and suddenly not mid corner.


So, did you put in the right links or just remove the sway bar?
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Re: Help diag this problem on my E30

Postby Yoshi » Wed Sep 30, 2009 12:27 pm

I got some stock links. probably going back to a stock bar soon and no rear.
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Re: Help diag this problem on my E30

Postby nogapersnBMWs » Thu Oct 01, 2009 5:57 am

Yoshi wrote:I got some stock links. probably going back to a stock bar soon and no rear.


Aftermarket sway bar end links are a pain sometimes (I had a similar problem that took me forever to find, and my aftermarket crappy IE end-links were designed for an E30!). I've tried that no rear sway-bar set-up and it is real nice in the right situations. Definately promotes oversteer and inside rear tire dramatics in corners! Fun...

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