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E46 M3 (2001-2006) Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006.


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Old Sat, Mar-23-2019, 01:09:55 AM   #1
cudzich09
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Default Convertible Springs, need help from the community

Hello All,

I ran into a dilemma while attempting to assemble the front shocks on a convertible, cannot figure out which parts are incorrect.

Background: 03 Convertible, the previous owner installed new suspension [shocks, struts, springs, control arms, inner/outer tie rods, links]. While removing the dinan exhaust, I noticed the front shocks looked off. Turns out both are for the right side... No biggie. Ordered the left side shock, disassembled everything, went to a shop to install the springs properly on the shock and $%^&%

The mechanic cannot put back together the shock because top of the spring sits on the outer edge of the guide support (# 1 on RealOem or rather #7 Spring Pad Upper [rubber boot]

Its not "hugging it properly", the top end of the spring will pop out and rub the guide support.

My question to the community is this, I can't get the p/n for the convertible spring right now, but is there a difference between coupe and convertible top end of the spring diameter.

I am thinking the spring is not meant for the convertible. ECS has different springs for coupe/convertible.
For convertible models only 31332282332
For coupe models only 31332283130

Thanks for your time,
Cheers!

Last edited by cudzich09; Sat, Mar-23-2019 at 01:25:12 AM.
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Old Sat, Mar-23-2019, 03:02:21 AM   #2
maynard423
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Default Re: Convertible Springs, need help from the community

If you need OE springs I have a full set from my Vert front and rear. I pulled them at 70k.


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Old Sat, Mar-23-2019, 03:30:03 AM   #3
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Default Convertible Springs, need help from the community

Quote:
Originally Posted by maynard423 View Post
If you need OE springs I have a full set from my Vert front and rear. I pulled them at 70k.


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Thanks, might get in touch with you once I clear it up.
Heads-up, only need fronts.


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Old Sat, Mar-23-2019, 01:46:01 PM   #4
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Default Re: Convertible Springs, need help from the community

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Originally Posted by cudzich09 View Post
Thanks, might get in touch with you once I clear it up.
Heads-up, only need fronts.


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No problem


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Old Sat, Mar-23-2019, 04:05:53 PM   #5
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Default Re: Convertible Springs, need help from the community

Does anyone have any input on this?
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Old Sat, Mar-23-2019, 09:46:57 PM   #6
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Default Re: Convertible Springs, need help from the community

I basically can't determine whether I have the wrong springs or upper strut mounts.
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Old Sun, Mar-24-2019, 01:58:30 AM   #7
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Default Re: Convertible Springs, need help from the community

Pictures would be a big help here. Can he re- assemble the one he took off? It would seem he could look at the old strut and the new and figure out what is different.
I'd be surprised if the top of the spring is a different diameter between coupe and vert, but you should be able to play around on realoem to see if the mating parts are the same or different; I expect they'll be the same. The spings are different because the vert weighs a little more and is less rigid, so they probably fine-tuned for this.

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Last edited by RedM3/4; Sun, Mar-24-2019 at 02:06:51 AM. Reason: clarity
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Old Sun, Mar-24-2019, 06:54:49 PM   #8
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Default Re: Convertible Springs, need help from the community

Quote:
Originally Posted by RedM3/4 View Post
Pictures would be a big help here. Can he re- assemble the one he took off? It would seem he could look at the old strut and the new and figure out what is different.
I'd be surprised if the top of the spring is a different diameter between coupe and vert, but you should be able to play around on realoem to see if the mating parts are the same or different; I expect they'll be the same. The spings are different because the vert weighs a little more and is less rigid, so they probably fine-tuned for this.

ADS
Thanks to Maynard423, I solved the issue.

Wrong springs, he was able to measure the top and bottom of the spring diameter of the spiral. On the M3 Convertible, it measures 5'' for top and bottom. The set of springs on hand were 5'' on the bottom and 6'' at the top.

To top it off, we made a deal so win-win.

Thanks!
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Old Sun, Mar-24-2019, 06:56:41 PM   #9
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Default Re: Convertible Springs, need help from the community

Pics for the record.

My incorrect set of springs measured at the top. 6''



M3 Convertible top measurement by Maynard423, 5''
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Old Tue, Mar-26-2019, 02:30:25 AM   #10
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Default Re: Convertible Springs, need help from the community

Glad to help. Springs were dropped off via UPS this morning.


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Discussing SMG troubleshooting FAQ in the E46 M3 (2001-2006) Forum - Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006. at BMW M3 Forum.com (E30 M3 | E36 M3 | E46 M3 | E92 M3 | F80/X)