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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Technical Forums > Suspension | Brakes | Chassis > RSM Importance?

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      12-19-2008, 01:48 AM   #1

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RSM Importance?

I know from my E46 days that RSMs were a semi-important mod when going with aftermarket suspensions. I dont really see any mention of them here...am I blind, did the E90 fix this, or is the community overlooking these?
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      12-19-2008, 03:07 AM   #2
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I know that TC Kline has upgraded RSMs (in two flavors) for the E90's, but I'm not sure about others.

But let's be honest, the vast majority of guys here are buying KW V2s, PSS10's, FK's, whatever strictly for cosmetic purposes (to drop the car on 19" wheels.) Nothing wrong with that, but it probably doesn't tax the stock RSM.

The harder core track guys are swapping in M3 parts (wishbones, tension links, rear sub-frame bushings) D/A coil-overs with camber plates, et. al. I'm sure most of those guys are also running upgraded RSMs.
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      12-19-2008, 10:41 AM   #3

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If I were going to put in any rallye time I would look into bolstering the rear shock mounts, but the subframe etc. on the E9x does seem better designed than the E46.
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