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I was looking at the motion ratio calculation that was done with the spring removed. I think you settled on a figure of 0.567. It appears to me the actual motion ratio can be lower if there is too much compliance in the rear sub frame bushings. Probably with M3 bushings, there wouldn't be much significant distortion. If the stock 135i bushings are used, I reckon it would reduce the effective spring rates at the wheel. Maybe its something when analysing the factory stock configuration.
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