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 > Engine, Transmission, Exhaust, Drivetrain, ECU Software Modifications
 
Post Reply
 
Thread Tools Search this Thread
      10-11-2021, 10:37 PM   #1
Mog-10
Private First Class
145
Rep
107
Posts

Drives: E93 m3
Join Date: Apr 2021
Location: Home

iTrader: (0)

Need help with diff whine?

So I wanted to share my experience with trying to eliminate diff whine.

So originally I was running Turner solid diff mounts to help with broken diff bolts and Axel hop that had caused a lot of Carnage. The whine was bad and I lived with it for a year. I decided to do an super 8.8 swap it has a Torsen T2R differential and is known for being noisy even when using factory rubber mounts. I had mounted it solid with steel mounts no bushings at all. The whine was horrible.

So I had remembered an old dynamat display with the bell and had the idea of using something similar.


I decided to go with Rockville rockmat as it is cheap butyl rubber and has an adhesive that is good to 300 f . Cost less then $15

I had used two strips at the front of the sub frame and back at the top most part closest to the body. I had also stuck a chunk on the top of the diff.

Well it worked no more whine. I have been running it like this for about two months the adhesive is holding with no signs of delamination from the heat under the car.

I know my set up is different then everyone else but the concept should work the same. I hope this can help quiet some differentials.

Yes I know this stuff is made for car audio.
Attached Images
  

Last edited by Mog-10; 01-17-2022 at 10:30 PM..
Appreciate 10
      10-11-2021, 10:56 PM   #2
Redd
Brigadier General
3806
Rep
4,113
Posts

Drives: 2010 BMW E92 M3 Dakar Edition
Join Date: Jul 2015
Location: Malaysia

iTrader: (0)

You, my friend, are a genius!
Appreciate 2
Mog-10145.00
DrFerry6682.00
      10-12-2021, 12:35 AM   #3
Throatpunch
Captain
353
Rep
664
Posts

Drives: 2008 E93 M3
Join Date: Jun 2010
Location: Philly, PA

iTrader: (0)

That's a great idea!
Appreciate 1
Mog-10145.00
      12-08-2022, 06:09 PM   #4
CTMike
First Lieutenant
United_States
258
Rep
311
Posts

Drives: 2021 X5 40i MSport/2011 E93 M3
Join Date: Jul 2016
Location: CT

iTrader: (1)

Giving this a small bump since I saw it referenced in a recent thread - anyone else taken a similar approach?
__________________
--
Gone but not forgotten: 2005 X3 2.5 6spd, 2011 X5 50i, 2015 328d Wagon
Appreciate 1
Mog-10145.00
      12-09-2022, 01:41 AM   #5
RocketyMan
First Lieutenant
RocketyMan's Avatar
United_States
213
Rep
320
Posts

Drives: E53 X5, E83 X3, E93 M3
Join Date: Nov 2022
Location: PNW

iTrader: (0)

Garage List
2008 BMW M3 E93  [10.00]
I'm willing to try it out since I'm getting a whine at the rear at 45 mph...
__________________
2008 BMW M3 E93 MT

R135
└┼┼┼
..246
Appreciate 0
      12-11-2022, 11:52 AM   #6
Gossypiboma
Major
541
Rep
1,193
Posts

Drives: 13' M3 6MT 18' M3 CS
Join Date: Aug 2012
Location: The John

iTrader: (7)

My rear subframe is currently out for subframe and diff bushings. I'll give this a go. Two sheets of 12x12 seem to be plenty?
Appreciate 0
      12-14-2022, 06:32 AM   #7
amrazM
mTekMods
amrazM's Avatar
United_States
2101
Rep
2,849
Posts

Drives: like a granny.
Join Date: Jan 2010
Location: Manhatan

iTrader: (1)

Quote:
Originally Posted by Gossypiboma View Post
My rear subframe is currently out for subframe and diff bushings. I'll give this a go. Two sheets of 12x12 seem to be plenty?
two 3x6 strips did it for me.
__________________
2011 Frozen Black/Fox Red E90 M3 650+WHP

G-Power Supercharged
First DCT to Manual Conversion Worldwide
KW CS, BBS RI-A, BW Headers, Snow 2.5
Appreciate 1
Mog-10145.00
      12-14-2022, 11:07 AM   #8
RocketyMan
First Lieutenant
RocketyMan's Avatar
United_States
213
Rep
320
Posts

Drives: E53 X5, E83 X3, E93 M3
Join Date: Nov 2022
Location: PNW

iTrader: (0)

Garage List
2008 BMW M3 E93  [10.00]
Quote:
Originally Posted by amrazM View Post
two 3x6 strips did it for me.
At the location on the rear-subframe like mentioned above?
__________________
2008 BMW M3 E93 MT

R135
└┼┼┼
..246
Appreciate 0
      12-28-2022, 12:46 AM   #9
RocketyMan
First Lieutenant
RocketyMan's Avatar
United_States
213
Rep
320
Posts

Drives: E53 X5, E83 X3, E93 M3
Join Date: Nov 2022
Location: PNW

iTrader: (0)

Garage List
2008 BMW M3 E93  [10.00]
Here's the sound deadening location I did on mine. This was done WITHOUT lowering the subframe at all--not ideal, but not too difficult.

It's done at the sides where the upper big "tube" of subframe is done. Then on the back side (which the diff is covering because it's hidden).

I haven't tried it out yet, but we'll see if it helps!
Attached Images
 
__________________
2008 BMW M3 E93 MT

R135
└┼┼┼
..246
Appreciate 1
DrFerry6682.00
      12-28-2022, 08:09 PM   #10
Mog-10
Private First Class
145
Rep
107
Posts

Drives: E93 m3
Join Date: Apr 2021
Location: Home

iTrader: (0)

That should work.
Appreciate 0
      07-24-2023, 03:15 PM   #11
kerrit
Major
346
Rep
1,095
Posts

Drives: Melbourne Red e90 M3
Join Date: Jul 2012
Location: Bellevue, WA

iTrader: (4)

Garage List
2008 E90 M3  [0.00]
2014 M5 CP  [0.00]
bumping this, reduced my whine by about 75% - well worth it, did it while subframe on the car, a bit tight but only took about 10min.

I had whine completely stock years ago, then the poly 'street' diff bushings made it worse. Now it's livable.
__________________
6MT | 11:1 Forged 4.1L | ESS-G1 | KW ClubSport | Sparta 380/355 BBK
Appreciate 2
DrFerry6682.00
Mog-10145.00
      07-27-2023, 01:03 AM   #12
RocketyMan
First Lieutenant
RocketyMan's Avatar
United_States
213
Rep
320
Posts

Drives: E53 X5, E83 X3, E93 M3
Join Date: Nov 2022
Location: PNW

iTrader: (0)

Garage List
2008 BMW M3 E93  [10.00]
Quote:
Originally Posted by kerrit View Post
bumping this, reduced my whine by about 75% - well worth it, did it while subframe on the car, a bit tight but only took about 10min.

I had whine completely stock years ago, then the poly 'street' diff bushings made it worse. Now it's livable.
Nice! Thanks for reporting your results!

I would say mine helped too.
__________________
2008 BMW M3 E93 MT

R135
└┼┼┼
..246
Appreciate 0
      12-17-2023, 11:24 AM   #13
Mog-10
Private First Class
145
Rep
107
Posts

Drives: E93 m3
Join Date: Apr 2021
Location: Home

iTrader: (0)

Bumping this for more too see.
Appreciate 1
DrFerry6682.00
      12-18-2023, 11:15 AM   #14
HairTooLongToo
New Member
13
Rep
29
Posts

Drives: M3
Join Date: Apr 2012
Location: None

iTrader: (0)

I recently tried this as my car has a pretty good case of the 43mph / 45mph diff whine. However I didn't notice any difference. Was worth a try though.

I used this exact product and applied 2 approx 3x6 strips to the center of the rear big subframe tube.

I might try doing some panels in the interior at some point, directly onto metal. Thinking maybe the trunk floor or even the left door where it seems to resonate from.
Appreciate 1
DrFerry6682.00
      12-18-2023, 02:57 PM   #15
RocketyMan
First Lieutenant
RocketyMan's Avatar
United_States
213
Rep
320
Posts

Drives: E53 X5, E83 X3, E93 M3
Join Date: Nov 2022
Location: PNW

iTrader: (0)

Garage List
2008 BMW M3 E93  [10.00]
Yeah I still hear mine at that exact speed of 43 mph to 45 ish. It def toned it down a bit, but I'm sure more strips on the subframe would help. I'm thinking the colder weather is causing the rubber butyl to not be as effective in cutting down the resonance/whine as oppose to when it's warmer.
__________________
2008 BMW M3 E93 MT

R135
└┼┼┼
..246
Appreciate 1
      12-19-2023, 01:15 AM   #16
HairTooLongToo
New Member
13
Rep
29
Posts

Drives: M3
Join Date: Apr 2012
Location: None

iTrader: (0)

That's a promising theory about the cold temperatures and hope you're right. I'll find out once the car is back out after winter. Next time I have access, I'll try throwing strips onto the front subframe tube as well. I'll be quite happy even if it can dull the sound a bit.
Appreciate 1
DrFerry6682.00
      12-20-2023, 09:51 AM   #17
Mog-10
Private First Class
145
Rep
107
Posts

Drives: E93 m3
Join Date: Apr 2021
Location: Home

iTrader: (0)

Each tube of the subframe can resonate sound from the diff, so if you only do one or 2 of the 4 there is a chance of sound resonating.
Appreciate 2
      12-20-2023, 05:22 PM   #18
DrFerry
Field Marshal
DrFerry's Avatar
United_States
6682
Rep
1,831
Posts

Drives: '08 E92 M3
Join Date: Jul 2010
Location: Greenville, SC

iTrader: (5)

Garage List
2008 BMW M3  [5.25]
2015 BMW X5  [4.50]
In my case, I had other things going on with the diff bearings due to rebuild and LSD installation errors by the supplier. However, when I removed the solid diff bushings and went back to the OEM diff bushings most of the diff noise went away. Problem mostly solved.... Ultimately, the diff had to be rebuilt as well as the ring and pinion backlash reset by a local repair shop. Here's a link to that thread.
.
HELP - Modulating Whirring Sound From Diff or Rear End Area???
https://www.m3post.com/forums/showthread.php?t=1540429
.
__________________
'08 E92 M3 DCT Melbourne Red/Bamboo Beige Leather/EDC/SSP Spec-R DCT clutch discs/SSP Pro-Gold DCT Fluid/Quaife LSD/3:45 Final Drive by Diffs Online/BE Bearings & ARP Bolts/Vibra Technics Engine Mounts/M3 World HFC X-Pipe/LUX H8 180/BPM Sport DCT Tune/PFC Z-Rated Pads/ECS Brass Brake Caliper Bushings/Alex Shop Solid Sub-frame Bushings/Motul 600/Tint
Appreciate 3
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 10:24 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