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 > Suspension | Brakes | Chassis
 
Post Reply
 
Thread Tools Search this Thread
      03-28-2021, 02:29 PM   #1
S65 SCHNAUZER
Second Lieutenant
S65 SCHNAUZER's Avatar
92
Rep
235
Posts

Drives: M3 E46 - TiAg/Cinnamon
Join Date: May 2020
Location: ATX

iTrader: (0)

BC Racing BR Clunk

So I just installed these coilovers (yes i know not the best ones) and have had a clunk in the driver's side whenever im going over even the slightest bumps.

I checked the top nut, reset the preload at 4mm and checked endlinks. Anyone have any suggestions? After resetting the preload the clunk got a bit quieter but its still there.

Thanks.
Appreciate 0
      03-28-2021, 04:04 PM   #2
bvrider1
Captain
341
Rep
787
Posts

Drives: e90 m3 + f80 zcp
Join Date: May 2016
Location: 3rdCoast

iTrader: (4)

Double check your torque specs on all mounting points.

I had a right rear clunk that I thought was the battery being stupid , but I somehow forgot to torque the top mounting bolt correctly.

When you checked the top nut, how many ft lbs do they require?

Quote:
Originally Posted by JIYONG View Post
So I just installed these coilovers (yes i know not the best ones) and have had a clunk in the driver's side whenever im going over even the slightest bumps.

I checked the top nut, reset the preload at 4mm and checked endlinks. Anyone have any suggestions? After resetting the preload the clunk got a bit quieter but its still there.

Thanks.
Appreciate 0
      03-28-2021, 05:04 PM   #3
S65 SCHNAUZER
Second Lieutenant
S65 SCHNAUZER's Avatar
92
Rep
235
Posts

Drives: M3 E46 - TiAg/Cinnamon
Join Date: May 2020
Location: ATX

iTrader: (0)

Quote:
Originally Posted by bvrider1 View Post
Double check your torque specs on all mounting points.

I had a right rear clunk that I thought was the battery being stupid , but I somehow forgot to torque the top mounting bolt correctly.

When you checked the top nut, how many ft lbs do they require?
so bc racing stated that torque specs should follow the factory specs so for the strut tower nuts i went with 25 ft lb (3 on each side) and the strut mount nut wouldve been 47 ft lb
Appreciate 0
      03-28-2021, 05:18 PM   #4
The.white.m3
Second Lieutenant
The.white.m3's Avatar
73
Rep
293
Posts

Drives: Bmw
Join Date: Jul 2015
Location: Montreal

iTrader: (3)

From what i hear there’s no fix. But i’d love to hear otherwise
__________________
Follow me on Instagram :

https://www.instagram.com/the.white.m3/
Appreciate 0
      03-28-2021, 05:53 PM   #5
S65 SCHNAUZER
Second Lieutenant
S65 SCHNAUZER's Avatar
92
Rep
235
Posts

Drives: M3 E46 - TiAg/Cinnamon
Join Date: May 2020
Location: ATX

iTrader: (0)

Quote:
Originally Posted by The.white.m3 View Post
From what i hear there’s no fix. But i’d love to hear otherwise
damn...its strange cause its only one side and is pretty constant
Appreciate 0
      04-01-2021, 02:04 PM   #6
Z K
Major General
Z K's Avatar
1886
Rep
5,504
Posts

Drives: E90 M3, G20 M340i
Join Date: Jul 2011
Location: San Francisco

iTrader: (3)

It may be the upper camber plate spherical bushing is bad. They go out over time and need to be replaced. It would be kinda odd that they'd be bad when new.
__________________
Auto Detailing Enthusiast!

Last edited by Z K; 04-01-2021 at 02:31 PM..
Appreciate 0
      04-01-2021, 04:09 PM   #7
Vuu
Astronaut
Vuu's Avatar
514
Rep
732
Posts

Drives: E92 M3
Join Date: Nov 2018
Location: Orange County, CA

iTrader: (7)

It's most likely the bottom bolt that holds your strut in place.

When I installed my suspension, I was getting the same symptoms as you, even after torqueing to spec.
Appreciate 0
      04-02-2021, 08:54 AM   #8
Camnyc
wannabe
252
Rep
819
Posts

Drives: E90 LCI M3
Join Date: Dec 2012
Location: nyc

iTrader: (3)

reset the preload, 6-8mm up front and make sure the swaybar endlinks are even on both sides and that there is no binding of the swaybar. also check to make sure the endlinks are tightened on the strut and swaybar.

if installed properly and preloaded properly, there should be no noise.
__________________
E90 M3 - 6speed - slicktop - single hump
Appreciate 0
      04-02-2021, 09:44 AM   #9
S65 SCHNAUZER
Second Lieutenant
S65 SCHNAUZER's Avatar
92
Rep
235
Posts

Drives: M3 E46 - TiAg/Cinnamon
Join Date: May 2020
Location: ATX

iTrader: (0)

thanks for the input everyone, fcp euro sent me a new set which should be arriving today so ill be redoing it tomorrow and will update if anything changes
Appreciate 0
      04-02-2021, 10:08 AM   #10
S65 SCHNAUZER
Second Lieutenant
S65 SCHNAUZER's Avatar
92
Rep
235
Posts

Drives: M3 E46 - TiAg/Cinnamon
Join Date: May 2020
Location: ATX

iTrader: (0)

Quote:
Originally Posted by Camnyc View Post
reset the preload, 6-8mm up front and make sure the swaybar endlinks are even on both sides and that there is no binding of the swaybar. also check to make sure the endlinks are tightened on the strut and swaybar.

if installed properly and preloaded properly, there should be no noise.
what dampening did you have it on with 6-8 up front? im assuming you the left the rears as is from factory?
Appreciate 0
      04-03-2021, 07:36 PM   #11
S65 SCHNAUZER
Second Lieutenant
S65 SCHNAUZER's Avatar
92
Rep
235
Posts

Drives: M3 E46 - TiAg/Cinnamon
Join Date: May 2020
Location: ATX

iTrader: (0)

Just providing an update for other people's reference

Reinstalled the new set with fronts preloaded to 6.5mm and so far no clunking or barely anything noticeable. Also made sure of tight end links and put in new bushings

Dampeners are set to 12 clicks from soft for now since NJ roads are shit
Appreciate 0
      04-07-2021, 06:06 AM   #12
nishfish87
Private First Class
38
Rep
125
Posts

Drives: E92 M3, F85 X5M
Join Date: Jun 2016
Location: Orlando, FL

iTrader: (0)

I think I've got the same clunk coming from my rear drivers side. Any idea what it was?

I'm on BC BR as well.
Appreciate 0
      04-07-2021, 07:28 AM   #13
S65 SCHNAUZER
Second Lieutenant
S65 SCHNAUZER's Avatar
92
Rep
235
Posts

Drives: M3 E46 - TiAg/Cinnamon
Join Date: May 2020
Location: ATX

iTrader: (0)

Quote:
Originally Posted by nishfish87 View Post
I think I've got the same clunk coming from my rear drivers side. Any idea what it was?

I'm on BC BR as well.
just started getting that as well..id start by checking the shock mounts? after that id assume its the preload
Appreciate 0
      04-13-2021, 08:50 AM   #14
Camnyc
wannabe
252
Rep
819
Posts

Drives: E90 LCI M3
Join Date: Dec 2012
Location: nyc

iTrader: (3)

Clunking from the rear is usually from not enough preload or loose shock mount (upper).
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 06:49 AM.




m3post
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