Alignment
I just had the Z aligned and was very surprised too find out how much negative camber is allowed on the rear. BMW says -1.8 to -2.9. That is extremely aggressive. I have never run a car race or street with that much negative camber in the rear. No wonder rear tires do not last.
I am trying a little experiment. I currently have the rears set at -1.0. So far I am not noticing any negative handling attributes. Rear tires will last much longer. Once we have some dry days I will push it in the twisties to see the difference.
Factory settings on the front look fine.
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