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FYI I asked the different manufacturers for their spring rates for the 640i application. Of course it is not comparable as you also need to take into account dampening. But here are the facts.
Eibach:
front = 268 lbs/in
rear = 171 lbs/in
KW v3:
Front: 510 lbs/in
Rear: 185 lbs/in
What's interesting is that the KW v3 setup lists the same coilover part number for the 650i and the 640i. The 650i has an additional 245lbs on the front of the car, surprised they didn't tune a separate suspension for that. Bilstein has separate part numbers for the B12 pro-kit for 640i and 650i. Maybe because kw v3 you can set the rebound as needed?
Eibach does not list a lowering spring for the 650i on their website. But the Eibach springs interestingly are linear for this application.
KW v3s are progressive.
Last edited by socalengineer; 01-05-2021 at 06:12 PM..
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