RSM Importance? - BMW 3-Series (E90 E92) Forum

MuchMoore · 12-19-2008, 01:48 AM

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?

scollins · 12-19-2008, 03:07 AM

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.

stressdoc · 12-19-2008, 10:41 AM

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.

12-19-2008, 01:48 AM	#1
MuchMoore Colonel Drives: 08 E90 335i Join Date: Jul 2008 Location: CenFla Posts: 2,315 iTrader: (28)	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? __________________ \| Andrew \| M Technik \| BMW Performance \| BBS \| Forge \| V1 \| LUX \| Bilstein \| Precision-Sport \|
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12-19-2008, 03:07 AM	#2
scollins Bootleggin' 'n Gunrunnin' Drives: 2010 e70 X5 35d Join Date: May 2007 Location: Renton, WA Posts: 2,346 iTrader: (3)	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. __________________ Scott 2010 E70 X5 35d Alpine White on Black with Dark Bamboo trim ZAP \| ZCW \| ZPP \| ZPS \| ZRC \| ZTP \| 322 \| 328 \| 330 \| 386 \| 4AZ \| 4UB \| 655 \| 6FL \| 6NF 2008 Ducati 1098S Red naturally....

12-19-2008, 10:41 AM	#3
stressdoc Moderator Drives: 335 E90 ZSP+ Join Date: Jun 2005 Location: MO Posts: 9,341 iTrader: (0)	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. __________________ My not-so-recent ED: http://www.e90post.com/forums/showthread.php?t=31829 Quaife, BMW Perf & M3 suspension, V5, M-sport, ... Please join BMWCCA http://bmwcca.org/index.php?pageid=c...&ref_by=300279

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