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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Technical Forums > Suspension | Brakes | Chassis > Steering deflection on bad roads?



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      09-21-2009, 11:10 AM   #1
cvc 22349a
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Steering deflection on bad roads?

When I hit a rut or crack in the road while in a curve my steering wheel deflects. It's a momentarily uncontolled feeling.. Any one know what causes this: soft bushings, upper shock mounts...? I have the stock sport supension with Koni FSD's and 19" Alufelgen CSL reps with PS2's.
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      09-21-2009, 07:38 PM   #2
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Quote:
Originally Posted by cvc 22349a View Post
When I hit a rut or crack in the road while in a curve my steering wheel deflects. It's a momentarily uncontolled feeling.. Any one know what causes this: soft bushings, upper shock mounts...? I have the stock sport supension with Koni FSD's and 19" Alufelgen CSL reps with PS2's.

What you are describing sounds like bump steer. I would recommend getting an alignment and adjusting your camber to maximum factory allowable and adjust your toe-in as well.

-Matt
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      09-21-2009, 10:39 PM   #3
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my car does this horribly.. every grove in the highway my car wants to be apart of
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      09-22-2009, 09:39 AM   #4
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Quote:
Originally Posted by AluFelgen View Post
What you are describing sounds like bump steer. I would recommend getting an alignment and adjusting your camber to maximum factory allowable and adjust your toe-in as well.

-Matt
Will give that a try Matt. Just don't want to lose too much straight line stability. I was just mentioning my mods; I don't think this has anything to do with the wheels/tires.
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      09-23-2009, 10:58 AM   #5
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that's pretty typical for the stock suspension unfortunately
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      09-23-2009, 12:37 PM   #6
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It sucks. The roads really suck up here. Gonna try changing alignment settings. Just thought I might be able to minimize or eliminate that with different bushings. Don't even know where I could get different shock mounts. And even then, I'm sure there'd be tradeoffs..
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      09-23-2009, 01:11 PM   #7
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Originally Posted by lonestar22 View Post
my car does this horribly.. every grove in the highway my car wants to be apart of
Typical of every BMW I've owned. That precise sensitive steering performance comes with a price.
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