ZPOST
BMW Garage BMW Meets Register Search Today's Posts Mark Forums Read


Go Back   ZPOST > BMW Z4 Technical Talk > Suspension and Braking Chat
  TireRack

SUPPORT ZPOST BY DOING YOUR TIRERACK SHOPPING FROM THIS BANNER, THANKS!
Post Reply
 
Thread Tools Search this Thread
      12-04-2007, 09:04 AM   #1
F87LUV
Lieutenant General
F87LUV's Avatar
United_States
3688
Rep
15,081
Posts

Drives: '16 M2, '23 GT4
Join Date: May 2007
Location: NJ

iTrader: (4)

Garage List
2023 Porsche GT4  [5.00]
2016 BMW M2  [8.66]
Stock sport suspension vs aftermarket

The OEM parts are on backorder which will hold up repairs from my accident so the body shop asked if maybe Id like to upgrade now and itll be faster so now im looking at tein springs/koni... is it worth it? I may consider eibach or h&r springs but im not looking to really drop my car... more concerned about handling.
__________________
IG: Trackinheels
Appreciate 0
      12-04-2007, 09:15 AM   #2
GP20
Major
Canada
95
Rep
1,269
Posts

Drives: Z4M, F80 M3, 991.2 GTS
Join Date: Jan 2007
Location: Canada

iTrader: (5)

What parts of the suspensions are you talking about that are backordered? What parts is the bodyshop replacing? Both front and rear axels?
__________________
2019 Porsche 911 4 GTS
2016 BMW M3
2008 BMW Z4M coupe
Appreciate 0
      12-04-2007, 09:18 AM   #3
F87LUV
Lieutenant General
F87LUV's Avatar
United_States
3688
Rep
15,081
Posts

Drives: '16 M2, '23 GT4
Join Date: May 2007
Location: NJ

iTrader: (4)

Garage List
2023 Porsche GT4  [5.00]
2016 BMW M2  [8.66]
rear shock/spring... oem is already over $200 which would cover the springs for the whole car...
__________________
IG: Trackinheels
Appreciate 0
      12-04-2007, 09:25 AM   #4
GP20
Major
Canada
95
Rep
1,269
Posts

Drives: Z4M, F80 M3, 991.2 GTS
Join Date: Jan 2007
Location: Canada

iTrader: (5)

Eibach + Koni adjustable struts/shocks are a very good set-up. But you'll have to replace springs and shocks at all 4 corners at the same time and not just the rears. If you're planning to keep the car for more than 2 years, get Rogue Engineering rear-shock-mounts at the same time (it'll save you a lot of money and hassles in the long run).

Shox.com is just about the cheapest place you can find for the Eibach springs and Koni struts/shocks package. (no I'm not affiliated with shox.com)
__________________
2019 Porsche 911 4 GTS
2016 BMW M3
2008 BMW Z4M coupe
Appreciate 0
      12-04-2007, 09:33 AM   #5
F87LUV
Lieutenant General
F87LUV's Avatar
United_States
3688
Rep
15,081
Posts

Drives: '16 M2, '23 GT4
Join Date: May 2007
Location: NJ

iTrader: (4)

Garage List
2023 Porsche GT4  [5.00]
2016 BMW M2  [8.66]
"Rogue Engineering rear-shock-mounts at the same time "


why? what do they do? sorry if i sound stupid, with all the modding ive done, would you believe ive never touched stock suspension on any car!
__________________
IG: Trackinheels
Appreciate 0
      12-04-2007, 09:41 AM   #6
GP20
Major
Canada
95
Rep
1,269
Posts

Drives: Z4M, F80 M3, 991.2 GTS
Join Date: Jan 2007
Location: Canada

iTrader: (5)

Quote:
Originally Posted by ZGirl4U View Post
"Rogue Engineering rear-shock-mounts at the same time "


why? what do they do? sorry if i sound stupid, with all the modding ive done, would you believe ive never touched stock suspension on any car!
It's the metal plate that goes over the top of the shock shaft and connects the shock body to the car's subframe.

Part #8:
http://www.realoem.com/bmw/showparts...43&hg=33&fg=45

The stock rear-shock-mounts are known to crack easily with aftermarket suspensions. Heck, they're known to crack easily with STOCK suspensions. The stock ones are just really thin pieces of metals and the aftermarket ones are thicker and stronger. So essentially, if you upgrade the rear-shock-mounts at the same time, you pretty much will never have to worry about them cracking/failing for many many years.
__________________
2019 Porsche 911 4 GTS
2016 BMW M3
2008 BMW Z4M coupe
Appreciate 0
      12-04-2007, 09:54 AM   #7
F87LUV
Lieutenant General
F87LUV's Avatar
United_States
3688
Rep
15,081
Posts

Drives: '16 M2, '23 GT4
Join Date: May 2007
Location: NJ

iTrader: (4)

Garage List
2023 Porsche GT4  [5.00]
2016 BMW M2  [8.66]
Ooooooooooh........... everything i see is for the e85... is the e86 suspension diff or is it just the engine?
__________________
IG: Trackinheels
Appreciate 0
      12-04-2007, 02:16 PM   #8
sixspeed
Z4M CSL
sixspeed's Avatar
United Kingdom
31
Rep
173
Posts

Drives: Alpine White Z4M Coupe
Join Date: Feb 2007
Location: London

iTrader: (0)

GP20, is that an issue on the M cars as well?
__________________
Appreciate 0
      12-04-2007, 02:29 PM   #9
GP20
Major
Canada
95
Rep
1,269
Posts

Drives: Z4M, F80 M3, 991.2 GTS
Join Date: Jan 2007
Location: Canada

iTrader: (5)

Quote:
Originally Posted by sixspeed View Post
GP20, is that an issue on the M cars as well?
I would imagine so. It's a well known issue for the E46 M3 and the stock RSM I took off from my Z4M looks just as skinny.
__________________
2019 Porsche 911 4 GTS
2016 BMW M3
2008 BMW Z4M coupe
Appreciate 0
      12-04-2007, 03:44 PM   #10
mister_roger
Private First Class
mister_roger's Avatar
13
Rep
136
Posts

Drives: 2003 Maldives Blue 2.5i
Join Date: May 2007
Location: Bellevue, WA

iTrader: (0)

I can totally vouch for the eibach, koni suspension setup. To me, the height is just about perfect. Not Tooo low, but just enough to differentiate it from a sport suspension setup. Ride comfort is firmer, but under control. It's nice that the shocks are adjustable so that you can fine-tune ride for comfort/sport.

I didn't replace the Rear Shock Mounts when i swapped suspenions. Now that I think about it, I probably should have had those replaced/upgraded at the same time. It's been a little over a year, and I'm starting to hear some small squeaking sounds from the rear when I go over big bumps. Not sure where exactly it's coming from, but it sort of sounds like the rear shock mount area. Oh well.
__________________
2003 Maldives Blue 2.5i -- 18" M6 wheels, 12mm rear spacer, ///MZ4 front bumper conversion, Eibach lowering springs, Koni shocks, Hotchkis F/R anti-roll bars, Helene Performance air filter.

Appreciate 0
      12-04-2007, 04:34 PM   #11
GP20
Major
Canada
95
Rep
1,269
Posts

Drives: Z4M, F80 M3, 991.2 GTS
Join Date: Jan 2007
Location: Canada

iTrader: (5)

Hey Roger,

We should get together sometimes and look at the noises on your car. I fixed my RSM noise by the way. I re-installed the top and bottom RSM metal washers and made sure the top nut was tightened properly and the noises went away. Also, did you remember if Truline re-used the RSM paper gaskets? Apparently, they actually serve a purpose in eliminating little noises.

Well if you pick up a set of RSM's I can just help you install them.
__________________
2019 Porsche 911 4 GTS
2016 BMW M3
2008 BMW Z4M coupe
Appreciate 0
      12-04-2007, 06:20 PM   #12
mister_roger
Private First Class
mister_roger's Avatar
13
Rep
136
Posts

Drives: 2003 Maldives Blue 2.5i
Join Date: May 2007
Location: Bellevue, WA

iTrader: (0)

That would be cool Eric. I'll have to take you up on your offer when the weather gets a little better
No immediate hurry, as it's not really a bother right now, but eventually I'll plan on changing the RSMs out.
__________________
2003 Maldives Blue 2.5i -- 18" M6 wheels, 12mm rear spacer, ///MZ4 front bumper conversion, Eibach lowering springs, Koni shocks, Hotchkis F/R anti-roll bars, Helene Performance air filter.

Appreciate 0
      12-26-2007, 01:57 PM   #13
sketchmunky
New Member
sketchmunky's Avatar
2
Rep
17
Posts

Drives: 2008 Z4 3.0si Coupe
Join Date: Dec 2007
Location: Nor Cal

iTrader: (0)

I'm also thinking about getting the Koni/Eibach setup for my car. Do any of you guys know if the 03 to 07 Z4 suspension will fit on my 08 Z4 3.0si coupe?
Appreciate 0
      12-26-2007, 04:34 PM   #14
BimmerZealot
Major
61
Rep
1,210
Posts

Drives: 2019 BMW X3 xDrive30i
Join Date: May 2007
Location: San Diego, California

iTrader: (2)

it should fit as long as you dont get the Z4M suspension components. I dont think the sport suspension vs non-sport is different in terms of aftermarket pieces.
Appreciate 0
      12-29-2007, 11:48 AM   #15
Reach
gone baby gone
381
Rep
1,052
Posts

Drives: 2016 F80
Join Date: Nov 2007
Location: Location, Location.

iTrader: (0)

Are there really any differences with the suspension components of the M vs non-M cars? I'd imagine the components are the same, but with stiffer spring rates and shock dampening.
Appreciate 0
      12-30-2007, 12:42 AM   #16
jmillet
Captain
jmillet's Avatar
63
Rep
666
Posts

Drives: 2023 Hyundai IONIQ 6 SEL AWD
Join Date: Aug 2007
Location: Seattle, WA

iTrader: (1)

Garage List
Different

Quote:
Originally Posted by Reach View Post
Are there really any differences with the suspension components of the M vs non-M cars? I'd imagine the components are the same, but with stiffer spring rates and shock dampening.
Check out the part numbers on realoem.com/bmw and you'll find the Z4 ///M suspension components are not the same as the Z4 components and are not inter-changeable.
__________________
Jim Millet
2023 Hyundai IONIQ 6 SEL AWD Ultimate Red
SOLD: 2007 BMW Z4 M Coupe Imola Red

Appreciate 0
      12-30-2007, 10:19 AM   #17
Dammmittt
My favorite sign.
Dammmittt's Avatar
South Korea
167
Rep
4,333
Posts

Drives: 2007 M Coupe
Join Date: Dec 2006
Location: Der Autobahnen

iTrader: (0)

The M cars are also heavier thanks to the iron block and have a different weight distribution.
__________________


07 ///M Coupe (Premium Package) Black Saphire Ext. Imola Red Int.

Best Website EVER!
Appreciate 0
      01-02-2008, 10:35 AM   #18
vachss
Captain
54
Rep
815
Posts

Drives: Z4 Coupe
Join Date: Jan 2008
Location: Ventura County, CA

iTrader: (1)

I'll take your old suspension parts

I have a Z4 coupe without the Sport Package. If anyone with the Sport pack is planning to upgrade their suspensions to an aftermarket system I'd be interested in your old BMW Sport pack parts (particularly the larger diameter sway bars) to upgrade mine. Just let me know. Thanks
Appreciate 0
      01-04-2008, 10:29 PM   #19
Reach
gone baby gone
381
Rep
1,052
Posts

Drives: 2016 F80
Join Date: Nov 2007
Location: Location, Location.

iTrader: (0)

Quote:
Originally Posted by jmillet View Post
Check out the part numbers on realoem.com/bmw and you'll find the Z4 ///M suspension components are not the same as the Z4 components and are not inter-changeable.
Different part numbers are natural as they would have different spring rates / shock combos for each chassis version.

My question is, do they use the same suspension type and mounting points? Does anyone have diagrams for the stock suspention for both the M and Roady?

Thanks.
Appreciate 0
      01-07-2008, 01:52 PM   #20
pbdm4k
Lieutenant Colonel
pbdm4k's Avatar
Canada
74
Rep
1,689
Posts

Drives: 2010 335d
Join Date: May 2007
Location: North of the Border

iTrader: (3)

Quote:
Originally Posted by Reach View Post
Different part numbers are natural as they would have different spring rates / shock combos for each chassis version.

My question is, do they use the same suspension type and mounting points? Does anyone have diagrams for the stock suspention for both the M and Roady?

Thanks.
All the suspension mounts up the same way and shocks/springs from sport and non sport are physically identical. Difference in part numbers would attribute to their difference in valving and spring rates.

If you go aftermarket none of this matters as its all the same.
Appreciate 0
      01-07-2008, 02:41 PM   #21
mPlasticDesign
Major General
mPlasticDesign's Avatar
684
Rep
5,069
Posts

Drives: BMW 230i Msport w/LSD
Join Date: Nov 2007
Location: Astral Projecting: ∞ 23.516 -122 02.625 0242.101 ĕv'rē-hwâr'

iTrader: (16)

Garage List
Quote:
Originally Posted by Dammmittt View Post
The M cars are also heavier thanks to the iron block and have a different weight distribution.
You mean a perfect near 50/50 distribution?
M=Weight distribution, front/rear - Manual Transmission 50.2/49.8 %
3.0=Weight distribution, front/rear - Manual Transmission 49.7/50.3 %
__________________
Appreciate 0
      01-07-2008, 02:53 PM   #22
Dammmittt
My favorite sign.
Dammmittt's Avatar
South Korea
167
Rep
4,333
Posts

Drives: 2007 M Coupe
Join Date: Dec 2006
Location: Der Autobahnen

iTrader: (0)

Exactly...the weight distribution moves forward...
__________________


07 ///M Coupe (Premium Package) Black Saphire Ext. Imola Red Int.

Best Website EVER!
Appreciate 0
Post Reply

Bookmarks

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off



All times are GMT -5. The time now is 02:28 AM.




zpost
Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2024, vBulletin Solutions Inc.
1Addicts.com, BIMMERPOST.com, E90Post.com, F30Post.com, M3Post.com, ZPost.com, 5Post.com, 6Post.com, 7Post.com, XBimmers.com logo and trademark are properties of BIMMERPOST