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



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      05-19-2014, 11:33 AM   #1
MikeE90NC
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Suspension decision

Hi all, going to place an order this week for 1 of 2 setups Koni yellow w/ eibachs or ST V1. I am not sure which to go with so I am hoping I can get some solid opinions.

I found a set of koni yellows w/ eibach pros for less than 720 shipped, and with ST coils offering 100 rebate on their v1 that puts them at just over 720 shipped once the rebate returns. I am not tracking the car or anything but it is my DD, I have read positive opinions about both. One concern of mine on the coils is that I live in the south and we do occasionally get ice/snow where I live so rust is a legitimate concern. Also, I may possibly order rims/tires this week to compliment the suspension so I am trying maximize what I have in my pocket to throw at my car.
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      05-19-2014, 11:49 AM   #2
XM_Rocks
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Are you on sort pack suspension now?

Miles?
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      05-19-2014, 11:50 AM   #3
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youll be fine with either. If you want adjustability go with the st. How long are you planning on keeping the car? I personally have kw v1 as rust is a major concern. I dont personally have ST's so im not sure how rust prone they are. if you really need adjustability get the ST and buy a rust prevention spray if you ask ST they should recommend a specific spray and just spray them before winter and they should last. I hope I helped.
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      05-19-2014, 11:52 AM   #4
MikeE90NC
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Quote:
Originally Posted by XM_Rocks View Post
Are you on sort pack suspension now?

Miles?
Ah yes, right now I am stock non-sport suspension. 66k miles.
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      05-19-2014, 12:49 PM   #5
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guess it depends on your priorities...for example

if height adjustment is important, then ST

if damping adjustment is important, then Koni

if lowering is not important, get Konis and used ZSP springs.
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      05-19-2014, 01:49 PM   #6
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Quote:
Originally Posted by mlifxs View Post
if lowering is not important, get Konis and used ZSP springs.
^ This

Actually the ZSP springs will give you a little drop.

I am actually abut to go Koni FSD w/ my ZSP springs and some new thrust bushings and top hats/strut mounts.

Here is my car on ZSP suspension... to me its the perfect height.

I wouldn't want to be any lower.



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      05-19-2014, 02:25 PM   #7
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OP it is also the "conventional wisdom", that if you go with say eibach springs or something lower than ZSP, you might want shorter bump stops. This maybe adds $50 to the Koni / Eibach scenario.
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      05-19-2014, 03:34 PM   #8
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The bilstein b12 kit is also a well received kit for mild lowering and very good handling.
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      05-20-2014, 09:40 AM   #9
MikeE90NC
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Quote:
Originally Posted by mlifxs View Post
OP it is also the "conventional wisdom", that if you go with say eibach springs or something lower than ZSP, you might want shorter bump stops. This maybe adds $50 to the Koni / Eibach scenario.
Yes, I will be purchasing z4 bump stops while I am at it. Are they necessary to buy if purchasing coilovers? Also, is there anything else I need to buy to mount either setup?
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      05-20-2014, 09:52 AM   #10
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I was in the same boat as u OP. I was torn b/w the ST and Bistein B8 + swift springs. I chose Bilstein + swift over the ST coils for longevity and better performance. IMO u get better comfort and performance from a good set of struts and springs. Coilovers tend to wear faster and can run into more issues like noise, clunking, rattles, etc. plus u put more stress on other suspension parts. Just my .02 GL w/ ur decision.
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      05-22-2014, 04:47 PM   #11
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Where are you gettin Yellows and Eibach pros for that price??
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      05-22-2014, 10:33 PM   #12
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Quote:
Originally Posted by J2S2M View Post
I was in the same boat as u OP. I was torn b/w the ST and Bistein B8 + swift springs. I chose Bilstein + swift over the ST coils for longevity and better performance. IMO u get better comfort and performance from a good set of struts and springs. Coilovers tend to wear faster and can run into more issues like noise, clunking, rattles, etc. plus u put more stress on other suspension parts. Just my .02 GL w/ ur decision.
How are you liking the ride and the handling with your new setup?
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      05-22-2014, 10:51 PM   #13
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I absolutely love the ride! I actually just got back from the shop today. Swift + Bilstein b8 combo turned out perfect for my needs. Car feels much more planted and firm but definitely not bouncy or harsh. Now I no longer feel like the car is bouncing/jolting around anymore whenever I hit bumps at high speeds. The difference in overall feel is night and day. I am going to let the springs settle more the next few days and get a final alignment. I am sure after proper alignment, the driving dynamics will get even better. So far I am more than happy with my decision!
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      05-23-2014, 07:03 AM   #14
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Quote:
Originally Posted by J2S2M View Post
I absolutely love the ride! I actually just got back from the shop today. Swift + Bilstein b8 combo turned out perfect for my needs. Car feels much more planted and firm but definitely not bouncy or harsh. Now I no longer feel like the car is bouncing/jolting around anymore whenever I hit bumps at high speeds. The difference in overall feel is night and day. I am going to let the springs settle more the next few days and get a final alignment. I am sure after proper alignment, the driving dynamics will get even better. So far I am more than happy with my decision!
Which spring length and spring rates did you select?
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      05-23-2014, 12:26 PM   #15
MikeE90NC
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Ok, e36 m3 front bump stops and e85 z4 rear bump stops I take it. I am having a hard time locating a selection of these. Can someone point me in the right direction?

Last edited by MikeE90NC; 05-23-2014 at 02:47 PM.
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      05-23-2014, 03:16 PM   #16
MikeE90NC
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Also, are bump stops required with the ST coilover kit? The only bump stops that I can find (and its a pain in the ass to find them) would put me at nearly $100 extra for all 4.
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      05-23-2014, 06:03 PM   #17
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Quote:
Originally Posted by jjellyneck View Post
Which spring length and spring rates did you select?
I went with the E90 non-M version of the Swift R-spec springs. Here are the spring rates: F 223 lb/in R 615 lb/in
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