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      01-04-2012, 02:18 PM   #10
Doyle
Hellafunctional
 
Drives: 335xi
Join Date: Nov 2010
Location: N/A

Posts: 426
iTrader: (2)

The springs on all four corners of the x-drives are interchangeable with the spring from the respective corners of the RWD. Eg: Front left= front left, Front left =/= rear left.

The reason for the difference between the rates are the motion ratios. Motion ratio measures the relative leverage a spring can have on the wheel. Since the rear spring is much further in board, it has less effect on the wheel rate. The front motion ratio is close to 1:1, whereas the rear is close to .5:1.

The spring rates are fine for a comfortable grand tourer.
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