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      04-22-2015, 04:53 PM   #130
fe1rx
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Drives: 135i, 328i, Cayman S
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Quote:
Originally Posted by HP Autosport View Post
We typically use Swift thrust sheets in place of the rubber isolators so the rear springs can move freely with less spring rate spikes.

If noise is a concern, the thrust sheets acts like isolators as well.
I consider the issues separate.

I use thrust sheets on the top to allow the spring to unwind more easily (i.e. minimizing rate spikes). For this purpose thrust sheets are only needed on one end of the spring.

The bottom end of the spring sees more angular misalignment than the top because of the pivoting action of the camber arm. At full droop the spring is not fully seated on the camber arm. I suspect any spring without an isolator that protects both the bottom and the ID of the spring will have some paint worn off in these areas by the grinding action between camber arm and spring. Perhaps 60 mm springs fare better, but I am using 65 mm springs and they are a loose fit on the camber arm.
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