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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Technical Forums > Suspension | Brakes | Chassis > Possible suspension issue - advice needed



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      12-27-2012, 10:32 AM   #1
Tim182
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Possible suspension issue - advice needed

I have been having a few issues with my 325i M-Sport. For a while the car has been pulling heavily to the left. It has gone in for alignment (which was fine) and center steer adjustments (also fine). Still the car is pulling to the left.

The pull becomes more pronounced at higher speeds and with a more fully loaded car. The pull is so bad, that when loaded with 4 people and a suitcase going 120kmh on the highway, I have to countersteer and hold the steeling wheel at a 30 degree angle. The pull is immediate and this has also caused uneven tire ware. Without load and at 60kmh the steering wheel is almost straight.

Further there is a slight knocking sound coming from the rear right when fully loaded and going over bumps. I initially suspected a cracked or broken coil but apparently the coil is fine. The strange thing is that the rear left suspension as measured from the rim to the wheel arch is 1cm lower than the rear right without load and 2.5cm lower with load.

BMW inspected and told me this is within specs?!? They are now replacing the coil rubbers but I highly doubt that this is the issue. Can anyone confirm if all of this could be caused by coil rubbers? Otherwise any ideas what else could be causing this?
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      12-27-2012, 11:18 AM   #2
CJ421
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It's normal for a BMW to have uneven wheel gap on the left and right sides of the car.

The only reason I can think of why your car would pull more when weight is added is increased camber and toe. This is inherent to our suspension design - the camber and toe increase as the car gets lower to the ground. But I think that's not the actual problem - something bigger is at play (e.g. something is broken/worn on one side of the car and letting the toe/camber go further out than usual).

Questions:
-How many miles on the suspension?
-Has any suspension component been replaced?
-Could you post the alignment sheet?

I would get the car's suspension inspected by an independent shop used to working on BMWs.
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      12-27-2012, 12:15 PM   #3
Tim182
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Quote:
Originally Posted by CJ421 View Post
It's normal for a BMW to have uneven wheel gap on the left and right sides of the car.

The only reason I can think of why your car would pull more when weight is added is increased camber and toe. This is inherent to our suspension design - the camber and toe increase as the car gets lower to the ground. But I think that's not the actual problem - something bigger is at play (e.g. something is broken/worn on one side of the car and letting the toe/camber go further out than usual).

Questions:
-How many miles on the suspension?
-Has any suspension component been replaced?
-Could you post the alignment sheet?

I would get the car's suspension inspected by an independent shop used to working on BMWs.
Thanks, the car has 80000kms and still has the original suspension. I will upload the newest alignment sheet asap
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      12-27-2012, 01:01 PM   #4
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also what tires are you running?
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      12-27-2012, 02:47 PM   #5
Tim182
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Quote:
Originally Posted by VSmotorsports View Post
also what tires are you running?
This is on a new set of Pirelli P-Zero RFTs with +- 2500km on them. 225-40-18 and 255-35-18, stock sizes
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      12-27-2012, 03:10 PM   #6
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hmm could be radial pull which is normal, but from the sounds of it you are saying it pulls really hard correct?
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      12-27-2012, 05:48 PM   #7
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Quote:
Originally Posted by Tim182 View Post
This is on a new set of Pirelli P-Zero RFTs with +- 2500km on them. 225-40-18 and 255-35-18, stock sizes

New, you say.

Did the problem develop suddenly?
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      12-28-2012, 03:43 AM   #8
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Quote:
Originally Posted by VSmotorsports View Post
hmm could be radial pull which is normal, but from the sounds of it you are saying it pulls really hard correct?
Yes, an extreme pull.

The problem surfaced when I loaded the car. Before it was more subtle
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      12-29-2012, 11:43 AM   #9
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Quote:
Originally Posted by Tim182 View Post
Yes, an extreme pull.

The problem surfaced when I loaded the car. Before it was more subtle
Rotate tires. Change?
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