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Originally Posted by Go Horns!
Thanks for the review. Have you tested the range of adjustbility? How would you compare full-soft to the m-sport suspension? What setting do you normall drive on?
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I don't know exactly what you're asking so maybe this helps...
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The curb weight of each car tells a different story; to summarize, the 335i Coupe is laden with 3,542 lbs, the 335iS with 3,650 lbs while the M3 tips 3,704 lbs at the scales.
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Your chassis weight is going to effect your results vs. my results with an E82 @ 3220. With an extra ~100lb of un-sprung weight per corner your car is going to sit .44" lower (100/224 lb/in). I am guessing the E9x also sits a bit higher stock (more ground clearance) and has bigger wheel arch gaps. So, You might be happy with the little extra decrease in ride height? I can't say for sure since I don't have an E9x to measure.
M-sport suspension on an E92 @ 3600lbs runs 145/460 spring rates. That provides for a pretty soft luxury ride. YCW 4k/12k = 224/672 which gives you springs rates higher than what an M3 runs (E92 M3:160/550 lb/in @3700lbs). Hopefully that gives you an idea of how "sporty" the car is going to feel. The ride is still comfortable enough for me on the street, but it handles like a sport car now instead of a luxury boat.
Damping is a bit subjective. The settings you choose depend on your driving style and how you want the car to react. Over winter, I kept damping low at 2-3 notches. We were also still getting snow here up to a few weeks ago. Cold weather also makes the strut oil a bit thicker so you can dial things back a bit to keep it softer.