BMW M3 Forum (E90 E92)

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


Go Back   M3Post - BMW M3 Forum > E90/E92 M3 Technical Topics > Wheels + Tires Sponsored by The Tire Rack
  TireRack

KEEP M3POST ALIVE BY DOING YOUR TIRERACK SHOPPING FROM THIS BANNER LINK!
Post Reply
 
Thread Tools Search this Thread
      07-05-2012, 11:02 PM   #1
W Cole
Captain
 
Drives: 2009 M3
Join Date: Dec 2010
Location: Newport Coast, CA

Posts: 747
iTrader: (4)

ZCP Spring Retrofit?

I have searched thoroughly and am very surprised that I couldn't find anyone who has lowered their non-ZCP car by installing ZCP springs. I saw one member who retrofitted the entire ZCP strut and spring assembly onto this non-ZCP car and I noted in one post he questioned if the ZCP struts are any different than non-ZCP.

There seems to be a ton of conflicting information about the differences between ZCP and non-ZCP cars. I was wondering if anyone could lend some insight on the following:

- Are the ZCP struts different than non-ZCP?

- How is the lowering accomplished on a ZCP car? Springs? Different spring pads? Altered spring perch location? Or a combination of?

I could be going in the wrong direction entirely and perhaps this is why no one else has attempted this. I am looking for a very mild drop that will not prematurely wear out my struts and other suspension components. Perhaps the Dinan stage 1 kit is my best bet as I have read it provides a very similar ride height to ZCP?

Thanks.
W Cole is offline  
0
Reply With Quote
      07-05-2012, 11:10 PM   #2
tlp
Colonel
 
tlp's Avatar
 
Drives: '11 e92 M3 SG/FR
Join Date: Jul 2005
Location: Huntington Beach, CA

Posts: 2,036
iTrader: (6)

Garage List
2011 BMW e92 M3  [4.55]
There is a lot of conflicting info on that topic. The struts are different between EDC &ZCP as they have different part numbers. The exact confirmed differences are unknown. Some say lower perch or valving or a combination of the two. Since your sensitive to ride height and OEM component wear & tear you should consider the KW Sleeve over kit and call it day.
__________________
My Coding Journal
Current - '11 e92 M3 SG/FR ZCP|ZCV|ZP2|2MK|494|415|6NR|752
tlp is offline   United_States
0
Reply With Quote
      07-06-2012, 12:19 AM   #3
tibra1
Banned
 
Drives: 2011 ZCP M3 - 2007 335i crashd
Join Date: Apr 2009
Location: NYC

Posts: 6,777
iTrader: (4)

Can you even purchase ZCP springs w/o the dampers?

The ZCP suspension sits 0.4 inches lower
tibra1 is offline   No_Country
0
Reply With Quote
      07-06-2012, 12:25 AM   #4
tlp
Colonel
 
tlp's Avatar
 
Drives: '11 e92 M3 SG/FR
Join Date: Jul 2005
Location: Huntington Beach, CA

Posts: 2,036
iTrader: (6)

Garage List
2011 BMW e92 M3  [4.55]
Quote:
Originally Posted by tibra1 View Post
Can you even purchase ZCP springs w/o the dampers?

The ZCP suspension sits 0.4 inches lower
You can but there are no discrete part #'s for springs. The springs are an aggregate of the chassis and options associated to your build stored with your VIN#. Somewhere BMW has a matrix of the spring that was used on the car during production based on the initial production.
__________________
My Coding Journal
Current - '11 e92 M3 SG/FR ZCP|ZCV|ZP2|2MK|494|415|6NR|752
tlp is offline   United_States
0
Reply With Quote
      07-06-2012, 12:42 AM   #5
aajami
Brigadier General
 
aajami's Avatar
 
Drives: Space Gray '09 E92 M3
Join Date: Dec 2008
Location: Manhattan Beach, CA

Posts: 4,025
iTrader: (4)

Quote:
Originally Posted by W Cole View Post
I have searched thoroughly and am very surprised that I couldn't find anyone who has lowered their non-ZCP car by installing ZCP springs. I saw one member who retrofitted the entire ZCP strut and spring assembly onto this non-ZCP car and I noted in one post he questioned if the ZCP struts are any different than non-ZCP.

There seems to be a ton of conflicting information about the differences between ZCP and non-ZCP cars. I was wondering if anyone could lend some insight on the following:

- Are the ZCP struts different than non-ZCP?

- How is the lowering accomplished on a ZCP car? Springs? Different spring pads? Altered spring perch location? Or a combination of?

I could be going in the wrong direction entirely and perhaps this is why no one else has attempted this. I am looking for a very mild drop that will not prematurely wear out my struts and other suspension components. Perhaps the Dinan stage 1 kit is my best bet as I have read it provides a very similar ride height to ZCP?

Thanks.
I'm the guy who did the ZCP conversion.

I don't think there's clear consensus on what the difference between the struts are, primarily because there are no obvious visual differences between the two. My belief is that their valving and compression rates are a bit different based solely on the fact that they have different part numbers and different prices. It was also interesting to note that the ZCP struts are the same ones found on the 1M and the standard Japanese market M3.

As for the lowering, there's also no consensus there. The only difference in part numbers between ZCP and non-ZCP cars are the struts and springs -- the spring pads are the same part. It's either done through the springs or the spring perches (though as some have noted, the difference in perch location is practically imperceptible between the two struts).

Why not just order ZCP springs and see if you get the drop. As I recall, they're cheaper than the Dinan Stage I kit. If you don't get the drop, then you can either return the springs or buy the struts. Either way, you'd confirm where the drop comes from.
__________________
'09 E92 M3: Space Gray, Black, Carbon Leather | ZTP 2MK ZPP 2MT 6FL | link 1 / link 2
Mods: M Performance exhaust | ZCP retrofit | Euro airbox | GTS DCT flash | 240J ECU flash | LCI Euro taillights | CRT lip | OEM alarm retrofit | Space Gray bumper plugs | BMW Performance: Mk. II spoiler / Mk. II non-electronic steering wheel / mirror caps / front grilles / side gills / intake louvers / emblem
aajami is offline   United_States
0
Reply With Quote
      07-06-2012, 03:11 AM   #6
jonasaurus
Brigadier General
 
jonasaurus's Avatar
 
Drives: E90 M3 [Sold]
Join Date: Oct 2010
Location: NYC

Posts: 3,146
iTrader: (0)

Aajami's ZCP retrofit post
http://www.m3post.com/forums/showthr...ami+zcp&page=1

I'm still curious to this question of how is the 10mm drop achieved. Given they never offered ZCP for E90 M3s here in the UK, in wanting to keep it OEM, this appears to be a good solution for achieving slightly improved handling dynamics as well as aesthetics.
__________________
///M3 | E90 LCI | Space Grey | Fox Red with CF Structure | 6MT | 260M | My build
jonasaurus is offline   United Kingdom
0
Reply With Quote
      07-06-2012, 08:45 AM   #7
THE TECH
BimmerPost Supporting Vendor

 
THE TECH's Avatar
 
Drives: BPMsport 2012 E92 M3
Join Date: Jun 2011
Location: Kansas

Posts: 13,103
iTrader: (45)

Garage List
Send a message via AIM to THE TECH Send a message via Skype™ to THE TECH
Sounds like a lotta work for little gain. Just get a good set of aftermarket springs. 10mm is hardly noticeable.
__________________
THE TECH is offline   United_States
0
Reply With Quote
      07-06-2012, 08:24 PM   #8
ChrisK
Brigadier General
 
ChrisK's Avatar
 
Drives: E92 M3
Join Date: Jun 2007
Location: IL

Posts: 4,859
iTrader: (4)

I put ZCP wheels on my non-ZCP '11 and no-one including other ZCP owners can tell the difference. Everyone has always asked me if I lowered my car. Who knows what BMW did in '11
Attached Images
   
__________________

2011 E92 M3: AW/BLK • DCT
Europäische Lieferung am 6. August 2010
ChrisK is offline   United_States
0
Reply With Quote
      07-06-2012, 09:13 PM   #9
W Cole
Captain
 
Drives: 2009 M3
Join Date: Dec 2010
Location: Newport Coast, CA

Posts: 747
iTrader: (4)

Quote:
Originally Posted by aajami View Post
I'm the guy who did the ZCP conversion.

I don't think there's clear consensus on what the difference between the struts are, primarily because there are no obvious visual differences between the two. My belief is that their valving and compression rates are a bit different based solely on the fact that they have different part numbers and different prices. It was also interesting to note that the ZCP struts are the same ones found on the 1M and the standard Japanese market M3.

As for the lowering, there's also no consensus there. The only difference in part numbers between ZCP and non-ZCP cars are the struts and springs -- the spring pads are the same part. It's either done through the springs or the spring perches (though as some have noted, the difference in perch location is practically imperceptible between the two struts).

Why not just order ZCP springs and see if you get the drop. As I recall, they're cheaper than the Dinan Stage I kit. If you don't get the drop, then you can either return the springs or buy the struts. Either way, you'd confirm where the drop comes from.
So there is a slight difference in perch locations?
W Cole is offline  
0
Reply With Quote
      07-06-2012, 10:52 PM   #10
aajami
Brigadier General
 
aajami's Avatar
 
Drives: Space Gray '09 E92 M3
Join Date: Dec 2008
Location: Manhattan Beach, CA

Posts: 4,025
iTrader: (4)

Quote:
Originally Posted by W Cole View Post
So there is a slight difference in perch locations?
I don't know. I wasn't able to measure the struts side by side.

As for the poster above, it does appear that the car might sit a hair higher than a ZCP.

At any rate, I wanted peace of mind that comes with an OEM solution, and I was able to get the necessary hardware for relatively cheap.
__________________
'09 E92 M3: Space Gray, Black, Carbon Leather | ZTP 2MK ZPP 2MT 6FL | link 1 / link 2
Mods: M Performance exhaust | ZCP retrofit | Euro airbox | GTS DCT flash | 240J ECU flash | LCI Euro taillights | CRT lip | OEM alarm retrofit | Space Gray bumper plugs | BMW Performance: Mk. II spoiler / Mk. II non-electronic steering wheel / mirror caps / front grilles / side gills / intake louvers / emblem
aajami is offline   United_States
0
Reply With Quote
      07-07-2012, 12:22 AM   #11
W Cole
Captain
 
Drives: 2009 M3
Join Date: Dec 2010
Location: Newport Coast, CA

Posts: 747
iTrader: (4)

Quote:
Originally Posted by aajami View Post
I don't know. I wasn't able to measure the struts side by side.

As for the poster above, it does appear that the car might sit a hair higher than a ZCP.

At any rate, I wanted peace of mind that comes with an OEM solution, and I was able to get the necessary hardware for relatively cheap.
It appears the poster above only retrofitted wheels and not any suspension components.

Thats unfortunate no one has gotten the two struts side by side. I wonder if my dealerships parts department would have the two in stock and let me compare?

Do you know if the ZCP cars use the same bump stops? Do they just sacrifice 10mm of suspension travel?
W Cole is offline  
0
Reply With Quote
      07-07-2012, 12:25 AM   #12
aajami
Brigadier General
 
aajami's Avatar
 
Drives: Space Gray '09 E92 M3
Join Date: Dec 2008
Location: Manhattan Beach, CA

Posts: 4,025
iTrader: (4)

Quote:
Originally Posted by W Cole View Post
It appears the poster above only retrofitted wheels and not any suspension components.

Thats unfortunate no one has gotten the two struts side by side. I wonder if my dealerships parts department would have the two in stock and let me compare?
Right. But he was implying there was no visual difference between the two cars.

I have a set of front and rear non-ZCP struts lying around. I've offered to ship them out to anyone who has a set of ZCP struts on hand that would also be willing to do a little side-by-side comparison in the name of science before, but there have been no takers.
__________________
'09 E92 M3: Space Gray, Black, Carbon Leather | ZTP 2MK ZPP 2MT 6FL | link 1 / link 2
Mods: M Performance exhaust | ZCP retrofit | Euro airbox | GTS DCT flash | 240J ECU flash | LCI Euro taillights | CRT lip | OEM alarm retrofit | Space Gray bumper plugs | BMW Performance: Mk. II spoiler / Mk. II non-electronic steering wheel / mirror caps / front grilles / side gills / intake louvers / emblem
aajami is offline   United_States
0
Reply With Quote
      07-07-2012, 12:33 AM   #13
Dave07997S
Colonel
 
Drives: 2013 BMW M3 ZCP Coupe
Join Date: May 2009
Location: Playa del Rey, CA

Posts: 2,519
iTrader: (1)

I notice the difference between ZCP and non...Heres my car with a 285/30/19 which is even shorter than the OEM 265/35/19





It is slight, but I do notice it.

Dave
__________________
2013 M3 Coupe-MR/BLK ZCP, ACM test pipes, BPM Stg2 dev. tune and Megan catback, AFE Stg2. with C/F elbow
Previous rides: 2011 M3 Coupe-MR/Blk
2007 Porsche 997C2S Speed Yellow/Blk sport seats
2004 BMW M3 Imola/Blk
Dave07997S is offline  
0
Reply With Quote
      07-07-2012, 05:26 PM   #14
aajami
Brigadier General
 
aajami's Avatar
 
Drives: Space Gray '09 E92 M3
Join Date: Dec 2008
Location: Manhattan Beach, CA

Posts: 4,025
iTrader: (4)

Quote:
Originally Posted by Dave07997S
I notice the difference between ZCP and non...Heres my car with a 285/30/19 which is even shorter than the OEM 265/35/19





It is slight, but I do notice it.

Dave
Any excuse to post pics of your beautiful car against the PDR backdrop, eh Dave?
__________________
'09 E92 M3: Space Gray, Black, Carbon Leather | ZTP 2MK ZPP 2MT 6FL | link 1 / link 2
Mods: M Performance exhaust | ZCP retrofit | Euro airbox | GTS DCT flash | 240J ECU flash | LCI Euro taillights | CRT lip | OEM alarm retrofit | Space Gray bumper plugs | BMW Performance: Mk. II spoiler / Mk. II non-electronic steering wheel / mirror caps / front grilles / side gills / intake louvers / emblem
aajami is offline   United_States
0
Reply With Quote
      07-07-2012, 08:14 PM   #15
Dave07997S
Colonel
 
Drives: 2013 BMW M3 ZCP Coupe
Join Date: May 2009
Location: Playa del Rey, CA

Posts: 2,519
iTrader: (1)

Quote:
Originally Posted by aajami View Post
Any excuse to post pics of your beautiful car against the PDR backdrop, eh Dave?
How'd you know..

How are you doing..survive the 4th of July. PDR was crazy at the jungle. One party was over 500 people.

Dave
__________________
2013 M3 Coupe-MR/BLK ZCP, ACM test pipes, BPM Stg2 dev. tune and Megan catback, AFE Stg2. with C/F elbow
Previous rides: 2011 M3 Coupe-MR/Blk
2007 Porsche 997C2S Speed Yellow/Blk sport seats
2004 BMW M3 Imola/Blk
Dave07997S is offline  
0
Reply With Quote
      07-07-2012, 09:44 PM   #16
aajami
Brigadier General
 
aajami's Avatar
 
Drives: Space Gray '09 E92 M3
Join Date: Dec 2008
Location: Manhattan Beach, CA

Posts: 4,025
iTrader: (4)

Quote:
Originally Posted by Dave07997S View Post
How'd you know..

How are you doing..survive the 4th of July. PDR was crazy at the jungle. One party was over 500 people.

Dave
I spent it in HB. First year that they've allowed fireworks in a long time. The city shut down two blocks of PCH north of the pier, and the whole street was like a mini Burning Man Festival -- good times.

I just got the CRT lip installed on my car. You should check it out soon.
__________________
'09 E92 M3: Space Gray, Black, Carbon Leather | ZTP 2MK ZPP 2MT 6FL | link 1 / link 2
Mods: M Performance exhaust | ZCP retrofit | Euro airbox | GTS DCT flash | 240J ECU flash | LCI Euro taillights | CRT lip | OEM alarm retrofit | Space Gray bumper plugs | BMW Performance: Mk. II spoiler / Mk. II non-electronic steering wheel / mirror caps / front grilles / side gills / intake louvers / emblem
aajami is offline   United_States
0
Reply With Quote
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
Forum Jump


All times are GMT -5. The time now is 12:02 PM.




m3post
Powered by vBulletin® Version 3.7.0
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
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