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
 
BPM Sport
Post Reply
 
Thread Tools Search this Thread
      05-08-2013, 07:43 PM   #1
vinniechin
Vinnie
United_States
1
Rep
174
Posts

 
Drives: E93 Space Gray DCT
Join Date: Jun 2012
Location: Northern NJ

iTrader: (1)

AKG Poly Differential Bushing vs Turner

Hey all,

I have the Turner Delrin Diff bushings in the car now and it is definitely not NVH friendly. To be exact is more noise unfriendly than anything else.

However, with that said, the work amazing; the car shifts nice with no deflection you would normally feel in the upper RPM range in the rear. I don't want to lose the feel but my wife won't stand for the whine/howl of the differential. There is not longer any movement of the rear diff but the transmission of noise is tremendous through the chassis.

I was wondering if anyone used the AKG Polyurethane bushings and what their experience was with it compared to stock or something like Turner's kit. I think I can get some of the benefit without so much noise (I don't mind the vibration or harshness).

Will the poly make a large difference vs stock? They both have aluminum sleeves in them and the poly should be stiffer than stock but I wonder if its enough to help with the feel to justify the change.

Any ideas to decrease the noise would also help if anyone has experience with this. I don't know if using dynamat under the car would help, but would be willing to try unless someone says I shouldn't.

Solid subframe bushings however are well worth it with minimal increase in NVH but a much more planted rear end. Don't hesitate to get it done...handle better and save the subframe...win win I think.

Any tips or suggestions are welcomed. I tried a search but came up with nothing.

Thanks,
Vin
Appreciate 0
      05-09-2013, 01:25 PM   #2
RickyBobby
Lieutenant
RickyBobby's Avatar
14
Rep
518
Posts

 
Drives: M3
Join Date: Mar 2008
Location: NorCal

iTrader: (2)

I've got the akg 75d in my e36 differential. It's made of very hard material (think bowling ball) and does transmit a bit of gear noise like you are describing. Sounds like stock might be the best material for you in that location.
Appreciate 0
      05-09-2013, 01:29 PM   #3
Z K
Colonel
Z K's Avatar
United_States
26
Rep
2,173
Posts

 
Drives: E90 M3, MK6 GLI
Join Date: Jul 2011
Location: San Francisco

iTrader: (3)

Sounds like you need some harder than stock bushings but not as harsh as the solid bushings you have. I'd avoid polyurethane if possible as they need to be lubed regularly otherwise they will squeak.

Are there any motorsports grade upgraded rubber bushings available?
__________________
Auto Detailing Enthusiast!
Appreciate 0
      05-09-2013, 02:03 PM   #4
pbonsalb
Lieutenant Colonel
21
Rep
1,781
Posts

 
Drives: 08 E90 M3, 99 E36 M3 Turbo
Join Date: Feb 2011
Location: Concord, NH

iTrader: (3)

I use the AKG 95A bushings on my E36M3 and think they are fine. The 75D would not be as bad as delrin, but probably close to it.
Appreciate 0
      05-09-2013, 05:48 PM   #5
vinniechin
Vinnie
United_States
1
Rep
174
Posts

 
Drives: E93 Space Gray DCT
Join Date: Jun 2012
Location: Northern NJ

iTrader: (1)

Thanks guys. I will try the 95D
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
Forum Jump


All times are GMT -5. The time now is 08:01 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