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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Technical Forums > Suspension | Brakes | Chassis > Does tire pressure throw off alignment?



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      08-30-2009, 04:10 AM   #1
Scimitar335i
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Does tire pressure throw off alignment?

My car has been at the body shop for a while and we took it in for a 4 wheel alignment before it went into the dealer. The guys at the shop filled up my tires with air and I figured it was all good.

I went in for an alignment and they basically told me that the car was a little off and that it maybe due to bad shocks. Well, after I left and was on my way to the dealer my FTM comes on and I pull over into the nearest gas station and check my pressure. Well, come to find out my front driver side was 60psi, my rear driver side was 50, my front passenger was 40, and my rear passenger was 55psi!!!

I am running on stock RFT's and lowered the pressure. Fronts to 34 and the rears to 38psi. My question is if these odd tire pressures threw off my wheel alignment and when I get the car back from the dealer should I take it back in and get the alignment done again?

Thanks guys!!!
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      08-30-2009, 05:16 AM   #2
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I know during the last alignment I had they adjusted tire pressures back to spec...

it obviously has an effect when driving, but whether it throws things out in the process of checking the alignment, I'm not sure. I would think they should have corrected your tire pressures though.
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      08-30-2009, 01:47 PM   #3
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make sure the pressures are even.
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      08-30-2009, 02:01 PM   #4
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so it does throw off being able to properly align?
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      08-30-2009, 03:42 PM   #5
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I can, yes. But RFT's have such stiff sidewalls, the difference in pressures probably don't make as much of a difference (but 20psi diff from side to side is a lot).

how does the car drive now? does it track straight, or does it pull?
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      08-30-2009, 04:57 PM   #6
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No. NO NOOOOOOOOOOOOOOO. tire pressures do not change the mechanical alignment.
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      08-30-2009, 07:44 PM   #7
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Quote:
Originally Posted by 200Duece View Post
No. NO NOOOOOOOOOOOOOOO. tire pressures do not change the mechanical alignment.
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      08-31-2009, 11:46 AM   #8
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check all of your tire pressure when the car is cold. set to the factory spec on the inside of the driver door and leave it. the tires will move up and down in pressure according to air temp and road temp. if you make a whole bunch of right turns the left side tires are gunna be higher than the right.

the different air psi's that you have experienced are normal. And different tire pressurs will change the way the car drives, handles nd tracks down the road. try to keep them as even as possible
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