Quote:
Originally Posted by cvc 22349a
Interesting to see this thread after almost 3 yrs.
I don't understand motion ration and susp frequency and don't really want to try.
I am interested in why aftermarket susp tuners don't emulate BMW's tripling the rear spring rate from the front (the 135i, 335i and M3 oe rates are all tripled in the rear from the front). Anyone know why?
A favorite vendor on this forum recommends doubling the rear from the front w/Swift springs. Other manufacturers don't even double the rear rate from the front.
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What is your source for the spring rates? The figures I've seen do not agree with your theory about tripling the front rate.
Stock 135i:
• Front: 120 lb/in
• Rear : 350 lb/in
135i BMW Performance:
• Front: 160 lb/in
• Rear: 420 lb/in
Stock M3 e92:
• Front: 160 lb/in
• Rear: 550 lb/in