https://www.e46fanatics.com/threads/...estion.912308/
As Z4 rear suspension is based on e46 rear suspension I did a search for e46 KW V3 rear springs. And this popped up. So KW has been selling springs that get compressed like that for at least 10 years now and havent even made any revisions to its products.
This from that e46 thread is interesting:
Quote:
With progressive springs it can be normal for some coils to touch under static load. The "beehive" shape allows the smaller coils on the end to fit partially inside the larger center coils upon further compression
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2009 35i DCT Havana brown with ivory white interior. Mods: Cobb stage 1+FMIC, Wagner EVO1 FMIC, BMS DCI, KW V3 suspension, M3 front control arms, Hardrace RTAB, Michelin Pilot Sport 4S tires.