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      01-11-2010, 11:02 PM   #39
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Drives: E30 M3; Expedition
Join Date: Apr 2007
Location: USA

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Originally Posted by rldzhao View Post
From my fresh measurement:

Stock front spring: ~12"
Front spring (mounted) perch-to-perch distance: ~8"
Preload compression: 12"-8"=~4"

Which means that the front suspension experiences a preload of roughly:

147 lbm/in * 4 in = ~588 lbm

Now, this number may be slightly high because the spring stiffness during the initial 20% of travel is less than 147 lbm/in, which means the preload will be <588 lbm.
Thanks. Knowing the perch-perch distance helps.
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