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Old 03-08-2003, 09:55 PM   #1
thinair
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Rear end goes sideways under accelereation?



Do any e36 drivers out there have a thing with your car where under hard acceleration, or quick shifting the rear end of the car feels like it's flexing to the right?

And it's not the tires breaking loose and the car sliding. It's a quick snap to the right, then it straightens, it only feels like 1-2" movement in the back.

Could it be worn rear toe bushings (bushings in the trailing arms)?? How do I check for that?
If so, should I get new factory ones, or do the obvious and get better ones?

The only reason why this bothers me now is because I have some left over cash that I'll probably spend stupidly, so I should as well get something for my car.....
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Last edited by thinair; 03-08-2003 at 10:00 PM.
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Old 03-08-2003, 11:04 PM   #2
bart320i
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switch all your bushings to urethane. I heard they make quite a difference in feel. I'm looking for some right now since I'm going to be putting on new suspension.
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Old 03-08-2003, 11:15 PM   #3
M50E30
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Nelson,

I would check all rear suspension bushings and make shure everything is torqued down properly. Also check your coilovers that they are set at the same level! If not...I hope your LSD isn't fu@ked.

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Old 03-09-2003, 01:27 AM   #4
M52_Alpina
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You better have your rear trailing arm bushings checked asap.. car pulls to left/right are syntoms of worn RTAB.

worn RTAB will cause cracking of the rear subframe mounts..

Do a search on bimmer forum for more details..
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Old 03-09-2003, 04:47 AM   #5
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have u seen your diff mounts
im guessing too much power nelson
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Old 03-09-2003, 01:16 PM   #6
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Nelson,

That's the classic symptom of shot rear trailing arm bushings.

Easiest way to test them is up on a hoist, and you stuff a prybar against the mounting point for the trailing arm, and see how much lateral play you have.

They aren't terribly expensive from BMW, but they are a bitch to replace if you don't have a hoist; better to get a shop to do it for you.


There are a few options when it comes to replacing them. One, you can go to the BMW Motorsport version, which is a little harder rubber than stock E36 stuff.

Two, you can get the Ground Control inserts (about $60 US), which go along with the BMW bushings and restrict side to side motion. For a street car, this is the best way to go.

Three, you can order up some poly-urethane bushings from BMP et al, but I'm not sure these have proven to last any longer than the stock BMW ones. They're certainly stiffer, but I've heard stories about them failing over time as well (this on regularly tracked cars).

Four, you can go to a spherical bearing unit, such as the Ground Control, or AA setup. Lots of NVH comes out of this one, but it's basically a lifetime part. $$$$ (about $400 US).


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Old 03-09-2003, 03:46 PM   #7
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it sounds like the problem i had when my rear shock went through the mount. You might want to check the following:

1. Check the shock to make sure it's not blown
2. Check all your rear suspension bushings for excessive wear
3. Check to make sure there isn't any rust or torn metal on your subframe or rear shock mount area
4. make sure your sway bar is still connected (this last one i'm not so sure if it'd cause that problem, but it might)
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Old 03-09-2003, 05:07 PM   #8
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Well, I doubt it's the shocks (there aren't many km's on them).

The rear suspension perches won't go any lower (but 3/8" spacers are installed under them), so I'm pretty sure they're at the same level. And it's not the LSD itself, it doesn't bare the weight of the suspension...

I was actually thinking of dropping the whole rear subframe in the spring to check my diff carrier bushings/mounts (for another issue I have). That'd probably be the best time to swap the RTAB's. I'm not a fan of paying someone to do something I can try to do myself.

Also, for those in the know, what are my options for subframe bushings? Just get stock again (if they need to be replaced)? It seems that my rear subframe has been shifted to the left a bit (which is why I want to drop the subframe), something that I noticed when I first got the car and went for an alignment.
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