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Old 07-17-2011, 07:43 PM   #16
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Join Date: Apr 2011
Location: Minneapolis
Posts: 9
My Ride: N/A
I think the simple way of looking at it is f=kx. Where k is the spring constant and x is the amount of compression of the bushing when hitting a bump in the road. By using a poly based bushing as oppose to the OEM rubber the spring constant is higher for the poly's. If the force from the bump is the same with a larger k the less the compression of the bushing, resulting in more force transfer from the bump to the rest of the car. I wondering though what failure would look like in a poly based bushing... it could get real ugly. Rubber wears and is less brittle. if a poly based could crack somehow that would be bad. Im replacing the RCAB on my m3 soon. I need a shop i can fix it myself to save money! Jeez
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