Quote:
Originally Posted by Julian2485
Anyone ?
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Where did you get those numbers?
4k = 224 lb/in and 13 k = 728. That latter is pretty stiff for a street car. Are you running coil overs? If not you're going to have to pick something fixed from aftermarket.
This is a great thread for spring rates, all really depends on what you want to do and how stiff you can stand. Good discussion of motion ratios and wheel frequencies later on in it.
http://www.e90post.com/forums/showthread.php?t=85206
Some numbers from that thread
Stock 335i e92:
• Front: 145 lb/in
• Rear: 460 lb/in
Stock M3 e92:
• Front: 160 lb/in
• Rear: 550 lb/in
335i KW v3:
• Front: 260 lb/in (progressive average)
• Rear: 570 lb/in
335i KW Clubsport:
• Front: 400 lb/in
• Rear: 570 lb/in
M3 KW v3:
• Front: 285 lb/in
• Rear: 630 lb/in
M3 KW Clubsport:
• Front: 508 lb/in
• Rear: 800 lb/in