Spring Rates

[penny]

Can't seem to find this information anywhere. What are the spring rates for stock springs vs. BMW PS vs. KW V2?

Any help is appreciated!

UPDATED: Feel free to correct me if incorrect

Stock:
Front: 120-125#
Rear: Progressive 300 - 350#

KW
KW2011: 220-300# (Average 255# at max ride hight)
KW2012: 570#

Bilstein PSS10
Front: 400#
Rear: 425-450#

BMW Performance Suspension
Front: ?
Rear: ?

[Mark M]

Agreed...I too have been searching for this detail...even posted a request for said detail a while back. However, I suspect the answer you will hear is that BMW and KW springs are progressive, meaning the rate increases as force is applied. (soft at first for pot holes, firm with greater compression for handling)

Mark M

[penny]

Thanks Mark. Charles1 tested the stock 135 springs and found:

Front 120-125 lbs.
Rear Progressive 300 - 350 lbs.

http://www.1addicts.com/forums/showp...98&postcount=8

That's pretty much all I could dig up here.

[penny]

A posting from Orb:

KW2011 220-300 lb/in (Average 255 lb/in at max ride hight)
KW2012 570 lb/in

http://www.1addicts.com/forums/showp...97&postcount=4

[MastaMind]

I'd be interested in the rates for the BMW Performance springs.

[Dave Mac]

125lb? Damn, that barely holds the front end off he ground. No wonder the car feels like a sponge. (I had an Evo RS before so I'm used to knife edged turn-in.)

Dave

[penny]

Updated.