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Suspension & Braking Forum by BimmerWorld
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Old 11-17-2012, 08:59 AM   #1
Registered User
Join Date: Jun 2002
Location: DE
Posts: 319
My Ride: 2002 330 CiC
Suspension Dilemmma! Please help me decide

Here's my thinking:

My FCABs are shot and I am going to get new struts at the same time. I have a 330 Ci convertible with 60,000 miles. I will get upgraded FCABs, FCAs, RSMs, mounts etc. at the same time. If I am doing this I want to upgrade, not just update. I don't want to lower the car since it already is lower than a stock M3 coupe so that means I don't need coilovers and can't use stiffer aftermarket springs. It's a vert and will never be auto-crossed or tracked. Basically I want to enhance the ZHP suspension without lowering.

Seems like most agree that if I am not looking to lower the car or track it that coilovers are simply not worth the $ and will probably have a worse ride so I'll go with the stock sport springs. The vert ride height is just right and as low as I care to go.

If I keep factory sways I won't get a significant upgrade in performance (vert has 24 mm F and 20 mm R) so I need to choose between TMS/H&R sways and UUC sways. There are plenty of people who complain about UUCs and no one ever complains about the TMS! Everyone loves H-sport but Hotchkis says they won't fit a convertible. UUC would offer a bigger increase in the rear but less in the front. TMS would only be 1 mm thicker but perhaps the adjustment could make it a little stiffer based on sway bar's arm length. UUC says theirs will fit, but the UUC rears barely fit on a coupe! Racing Dynamics (electrodyne?) makes a 27 mm/ 24 mm sway set but I don't know about the quality or fitment on a vert. Unless somebody can convince me to go with UUCs, I think TMS with teflon bushings will be best and I'll probably have to use a very firm setting in the rear. I am perplexed by UUC sways - some love them and others replace them. Are UUCs really worth the fitment difficulties and potential for noise? Has anyone had the rear sway mount tab tear with UUCs thicker rear bar? Do I really need the TMS weld on reinforcements for the rear sway mount if I will only drive on the street?

As for dampers, Bilsteins are supposedly harsh for the street and not adjustable. I'm really torn between Konis FSDs and Koni sports ("yellows")!! Everyone likes the yellows and says there bulletproof. The FSDs have fans who really love them but others who've had both FSDs and yellows say the FSDs are "odd" since they don't have the traditional road "feel" but still handle very well. Some say they'd pick yellows over FSDs for this reason. There were reliability questions with the FSDs too. Having said all of that, the FSDs are backordered so people are buying them as fast as Koni can make them!! Koni yellows are a "sure thing" but FSDs are a gamble that just might give the best of both worlds - Koni users please provide your opinions!!


1. Koni Yellows with TMS sways

2. Koni FSDs with TMS sways

3. Koni Yellows with UUC sways

4. Koni FSD with UUC sways

Thanks to everyone for their opinions!
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Old 01-30-2013, 09:02 PM   #2
Registered User
Join Date: Oct 2012
Location: Pittsburgh, PA
Posts: 29
My Ride: 2005 330ci ZHP
Well written. I asked a similar question got no answer. Interested to know if you made a decision. I am leaning towards FSD myself.
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