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 > Track / Autocross / Dragstrip / Driving Techniques
 
European Auto Source (EAS)
Post Reply
 
Thread Tools Search this Thread
      12-19-2017, 05:55 PM   #89
SQ13
Second Lieutenant
139
Rep
256
Posts

Drives: E46 M3
Join Date: May 2017
Location: US

iTrader: (0)

Quote:
Originally Posted by pbonsalb View Post
Yes and I donít like them at all. Fine at idle and up to a little before 2000. Very noticeable vibration from 2000-3000. Tapers off after that but still there. Would be great for a track car or a car that is street driven only occasionally to the track. But one if those mods that takes a lot away from comfortable daily driving since you cannot avoid going through 2000-3000 rpm range repeatedly in daily driving.

I will remove them. I donít think poly ďbreaks in.Ē I may first try retorquing them since sometimes too much torque on trans mounts adds vibration and just the right torque does not.
How would you describe the vibration? Is it drone-like, which makes it feel like the car is going to fall apart and your eardrums will disintegrate? I received my AKG 75D trans mounts for my track car, which is currently my primary car because my E36 is broken. Iím pairing them with BW GroupN motor mounts that have 15k miles on them.
Appreciate 0
      12-19-2017, 07:38 PM   #90
pbonsalb
Major General
2763
Rep
7,275
Posts

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

iTrader: (3)

A light vibration from the 80A mounts. No worry the car will shake apart. Just a light vibration that is noticeable enough that you feel it and would not want it every day in a street car. I still need to recheck the torque but am not confident reducing it will get rid of the vibration while still securing the mounts. I donít think you will like the 75D mounts on the street but you can live with them since itís temporary until your other car is fixed. However, I think you have the match wrong in that the BW motor mounts are softer than the 75D trans mounts. You should run softer trans mounts than motor mounts or at least equal. The 75D trans mounts might go well with solid or Delrin or 75d motor mounts ó real race car stuff.
Appreciate 0
      12-21-2017, 03:05 PM   #91
SQ13
Second Lieutenant
139
Rep
256
Posts

Drives: E46 M3
Join Date: May 2017
Location: US

iTrader: (0)

Thanks for the info. I realized I was wrong about what GroupN motor mounts are after ordering the trans mounts. So I may throw the GroupN mounts on the E36 and get poly mounts for E46.

The car is also getting monoball FCABs, RTABs, and RSMs. I already wear earplugs on long drives, but after installing all these parts, Iím guessing Iíll need to wear earplugs all the time.
Appreciate 0
      12-22-2017, 09:09 AM   #92
pbonsalb
Major General
2763
Rep
7,275
Posts

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

iTrader: (3)

If you want to pay to get a tuner to bump your idle speed to about 850 rpm, that may help. If you notice vibration at idle try holding the throttle steady at 850 and note whether you still feel it.

I ran Bimmerworld replica group n mounts on my e36m3 for a while and thought they were fine on that car but my idle speed is 850 rpm - also helps with a LTW flywheel or supercharger or cams.
Appreciate 1
SQ13138.50

      01-19-2018, 09:48 AM   #93
135
Captain
Australia
89
Rep
647
Posts

Drives: 135i
Join Date: Sep 2012
Location: Australia

iTrader: (4)

Thanks pbonsalb and bigjae1976. A bit of a delayed reply but I read your comments when you posted them and took them onboard and they had me rethinking solid mounts and, instead, considering something more compliant.

I had found these:
AKG $350+$75, 95A poly
https://www.akgmotorsport.com/produc...8x-e9x-non-m3/
https://www.akgmotorsport.com/produc...e92-e93-z3-z4/
(but could leave off the cups)

034 Motorsport $196+$50, 50-60A rubber
https://store.034motorsport.com/moto...2-n54-n55.html
https://store.034motorsport.com/moto...nger-side.html
https://store.034motorsport.com/tran...-line-bmw.html

BMW OE $32-45, __A (? durometer) rubber
E46 M3 trans mounts


The AGK mounts are poly and there have been a number of people on the N5X platform that have experienced issues with these mounts since the turbo is tucked away down the right-hand side near the mount and they become affected by the heat.

The 034 mounts are rubber but a softer mount. I've also read of issues on the N5X platform when they fail (fall apart) after a very short period (less than 1000kms!).

I was thinking 80A +/-10A would be suitable but haven't found anything in that range yet - the above were the closest that I've found so far.

The OEM E46 trans mount is another option but I haven't found any information on its hardness rating.
Appreciate 0
      01-19-2018, 10:32 AM   #94
///Mobbin
Colonel
///Mobbin's Avatar
776
Rep
2,223
Posts

Drives: m3
Join Date: Jul 2011
Location: Houston

iTrader: (2)

I just installed the AKG 95A transmission mounts on my DCT M3, they are totally hilarious, I can actually hear the clutches engaging now. Totally concur with the track-car-only descriptor on the website. Love them for my purposes but I definitely wouldn't install these on a street car. The AKG 75D engine mounts are going in next week (OE engine mounts currently installed).
__________________
2011 e92 m3 | Alpine White | DCT
Appreciate 0
      01-19-2018, 11:37 AM   #95
pbonsalb
Major General
2763
Rep
7,275
Posts

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

iTrader: (3)

Quote:
Originally Posted by 135 View Post
The OEM E46 trans mount is another option but I haven't found any information on its hardness rating.
Totally different shape, at least for my 6MT E90M3. Even if they do fit, they are soft. I tried them on my E36M3, which they do fit.
Appreciate 0
      01-19-2018, 12:04 PM   #96
SQ13
Second Lieutenant
139
Rep
256
Posts

Drives: E46 M3
Join Date: May 2017
Location: US

iTrader: (0)

Quote:
Originally Posted by ///Mobbin View Post
I just installed the AKG 95A transmission mounts on my DCT M3, they are totally hilarious, I can actually hear the clutches engaging now. Totally concur with the track-car-only descriptor on the website. Love them for my purposes but I definitely wouldn't install these on a street car. The AKG 75D engine mounts are going in next week (OE engine mounts currently installed).
Lol you need to ride in my car. If you think the 95As are bad, youíll think 75D trans mounts are hell.
Appreciate 1
///Mobbin775.50

      01-19-2018, 04:03 PM   #97
135
Captain
Australia
89
Rep
647
Posts

Drives: 135i
Join Date: Sep 2012
Location: Australia

iTrader: (4)

Quote:
Originally Posted by pbonsalb View Post
Quote:
Originally Posted by 135 View Post
The OEM E46 trans mount is another option but I haven't found any information on its hardness rating.
Totally different shape, at least for my 6MT E90M3. Even if they do fit, they are soft. I tried them on my E36M3, which they do fit.
Yes, the E9X M3 has different trans mounts. The E46 does fit my E82 and also non-M E9X. I'd think they'd be classed as a slight upgrade in terms of hardness as well as being solid rubber, instead of the fluid-filled OE mounts.
Appreciate 0
      01-19-2018, 07:27 PM   #98
pbonsalb
Major General
2763
Rep
7,275
Posts

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

iTrader: (3)

Something like the UUC black mounts with enforcer cups might be a good option if you are buying for a car that fits E46 M3 mounts. E21 mounts are also harder but have a bigger stud so you have to drill out the mounting hole a little.
Appreciate 0
      02-04-2018, 10:46 AM   #99
135
Captain
Australia
89
Rep
647
Posts

Drives: 135i
Join Date: Sep 2012
Location: Australia

iTrader: (4)

I've seen similar comments:

OEM -> E46 M3 -> Rogue Engineering -> UUC Black -> UUC Blue -> UUC Red

Up to Black for street-driven cars and Blue/Red for track only cars.

Since I'm also after engine mounts, I might just end up getting the 034 mounts as a set and see how they fair - a bit softer than I was looking for but an improvement over OE.
Appreciate 0
      03-28-2018, 09:44 AM   #100
///Mobbin
Colonel
///Mobbin's Avatar
776
Rep
2,223
Posts

Drives: m3
Join Date: Jul 2011
Location: Houston

iTrader: (2)

Quote:
Originally Posted by ///Mobbin View Post
I just installed the AKG 95A transmission mounts on my DCT M3, they are totally hilarious, I can actually hear the clutches engaging now. Totally concur with the track-car-only descriptor on the website. Love them for my purposes but I definitely wouldn't install these on a street car. The AKG 75D engine mounts are going in next week (OE engine mounts currently installed).
Okay, so that was short lived. Even for a car I drive on the street ~4 times per month and to/from the track the AKG 95A transmission mounts were too much NVH for me. I reinstalled some new OE rubber mounts last night and I feel like I am in a brand new car now, world of difference, and this is with the AKG 75D engine mounts still in. I would seriously only recommend the poly transmission mounts for cars that are trailered to/from the track.

Interesting additional observation, my exhaust sounds way better w/ the OE transmission mounts. I detected a change when I installed the polys but didn't realize how drastic it was. Engine mounts only FTW, leave those transmission mounts stock folks!
__________________
2011 e92 m3 | Alpine White | DCT
Appreciate 1
SYT_Shadow5283.50

      03-28-2018, 10:51 AM   #101
SYT_Shadow
///M Powered for Life
SYT_Shadow's Avatar
United_States
5284
Rep
6,928
Posts

Drives: E90M/E92M/F80CS/X5 35/MiniCS
Join Date: Sep 2010
Location: Greenwich, CT

iTrader: (1)

Quote:
Originally Posted by ///Mobbin View Post
Okay, so that was short lived. Even for a car I drive on the street ~4 times per month and to/from the track the AKG 95A transmission mounts were too much NVH for me. I reinstalled some new OE rubber mounts last night and I feel like I am in a brand new car now, world of difference, and this is with the AKG 75D engine mounts still in. I would seriously only recommend the poly transmission mounts for cars that are trailered to/from the track.

Interesting additional observation, my exhaust sounds way better w/ the OE transmission mounts. I detected a change when I installed the polys but didn't realize how drastic it was. Engine mounts only FTW, leave those transmission mounts stock folks!
thanks for the info!
Appreciate 1
///Mobbin775.50

      05-15-2018, 08:53 AM   #102
buldogge
Second Lieutenant
117
Rep
214
Posts

Drives: '00 MCoupe, '11 E90 M3
Join Date: Feb 2017
Location: Saint Louis

iTrader: (1)

Has anyone tried these Megan Racing motor mounts? How's the NVH compare to OE??

https://www.ebay.com/itm/Megan-Racin...tYkA-l&vxp=mtr

Also, they seem to come in 2 flavors...only differentiated by the color of the metal reinforcement...the durometer of the rubber is 70A on the "street" version, not sure what it is on the "race" version.

I would definitely use the street version, if I were to try them.

TIA
-Mark in St. Louis
Appreciate 1
      05-15-2018, 07:44 PM   #103
pbonsalb
Major General
2763
Rep
7,275
Posts

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

iTrader: (3)

Those trans mounts donít look anything like ours.
Appreciate 0
      05-15-2018, 10:30 PM   #104
buldogge
Second Lieutenant
117
Rep
214
Posts

Drives: '00 MCoupe, '11 E90 M3
Join Date: Feb 2017
Location: Saint Louis

iTrader: (1)

Yeah...I don't even care about the tranny mounts TBH...I was mainly wondering if anyone has tried the motor mounts.

I'm sure I'll just end up getting a pair of Corteco OEM motor mounts, as I don't track the M3.

-Mark

Quote:
Originally Posted by pbonsalb View Post
Those trans mounts donít look anything like ours.
Appreciate 0
      05-16-2018, 05:59 AM   #105
pbonsalb
Major General
2763
Rep
7,275
Posts

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

iTrader: (3)

I think someone should try the Megan motor mounts. Might be a good alternative to the $300 mounts done are using.
Appreciate 0
      05-22-2018, 04:45 PM   #106
buldogge
Second Lieutenant
117
Rep
214
Posts

Drives: '00 MCoupe, '11 E90 M3
Join Date: Feb 2017
Location: Saint Louis

iTrader: (1)

I also just noticed the UUC "OE replacement rubber mounts" with a "lifetime guarantee":

http://store.uucmotorwerks.com/engin...car-p1894.aspx

Anybody used these?

TIA
-Mark
Appreciate 0
      09-24-2018, 01:26 PM   #107
PHM3
New Member
12
Rep
11
Posts

Drives: M3 E92
Join Date: Mar 2016
Location: Slovakia

iTrader: (0)

Quote:
Originally Posted by ///Mobbin View Post
I just installed the AKG 95A transmission mounts on my DCT M3, they are totally hilarious, I can actually hear the clutches engaging now. Totally concur with the track-car-only descriptor on the website. Love them for my purposes but I definitely wouldn't install these on a street car. The AKG 75D engine mounts are going in next week (OE engine mounts currently installed).
I m so happy about this ) i just orded 95A tranny mounts. And its review i was looking for
Appreciate 1
///Mobbin775.50

      09-23-2019, 08:59 PM   #108
///Mobbin
Colonel
///Mobbin's Avatar
776
Rep
2,223
Posts

Drives: m3
Join Date: Jul 2011
Location: Houston

iTrader: (2)

Juster ordered some new engine mounts to try out, LINK.

New-ish offering from Turner (currently on sale). I went with the 90a option for street/track duty. Will report back after I get them installed, can't wait!
__________________
2011 e92 m3 | Alpine White | DCT
Appreciate 1
      09-25-2019, 09:31 PM   #109
135
Captain
Australia
89
Rep
647
Posts

Drives: 135i
Join Date: Sep 2012
Location: Australia

iTrader: (4)

Just an update to my previous posts, I ended up getting the Turner Motorsport solid engine, transmission and diff mounts.

I haven't installed the solid diff mounts yet because that was going to be an involved process but will install them in a few months. I don't expect much additional NVH compared to the current rear end setup.

I installed the solid engine and trans mounts and immediately noticed increased NVH. Since there were a lot of other changes made at the same time, I decided to remove just the trans mounts and revert back to OE trans mounts - NVH gone. This was just to ensure it was the trans mounts and not something else that contributed to the increased NVH. I didn't mind the increased NVH so the plan will be to re-install the solid trans mounts at the end of the year.

The solid engine mounts have been in for over six months and I have no complaints at all with them. Maybe a very slight (to me) increase in NVH but nothing at all that concerns me.
Appreciate 0
      10-07-2019, 05:04 PM   #110
M3MPH1S
Captain
M3MPH1S's Avatar
United_States
546
Rep
770
Posts

Drives: 2010 E92 M3
Join Date: Mar 2015
Location: Atlanta

iTrader: (8)

I have the Revshift 75D engine and trans mounts on my DCT E92 and my experience is that the engine mounts barely increased vibration at all. I have a friend with an E36 who had way worse steering wheel vibration at idle with 75D engine mounts. They did increase "mechanical" noise of the engine a bit, but not really THAT bad. For the trans mounts, I can't feel or hear an increase in NVH aside from shifting into/out of reverse/1st in parking lots (comically loud as someone else pointed out). Both of these are also very reasonably priced.

https://www.revshift.com/product-p/pmm-r36.htm

https://www.revshift.com/product-p/ptm-e9xm.htm


Now I can't give feedback on whether the increase is enough to ruin a stock daily setup since I have a fully catless RPI exhaust system, but I can still notice the small changes/increases in noise and the above were nbd to me. If you want your M3 whisper quiet then they may not be for you. It's not really doing a ton (anything?) anyway if you're just dailying.

I also have solid metal differential mounts from AKG and they did not add nearly as much noise as I was expecting. I would guess that if you have any kind of aftermarket muffler, it would be mostly covered up. Again, not something you'd really benefit from on a daily imo anyway.

https://www.akgmotorsport.com/produc...5-328-330-335/


And I also have solid metal subframe mounts and I would do those again in a heartbeat on a bone stock car. Zero NVH increase and very noticeable improvement. The F8X come from the factory with solid metal subframe bushings, so that should say something.


Edit - and to answer OP's question:
The diff and subframe mounts made a HUGE difference on track. The motor and trans mounts don't make a tangible difference, but once you lock down half of the drivetrain, I feel like you really need to lock down the other half based on simple physics assumptions, so I'm sure they are doing something to help maintain an even balance on the driveshaft.
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 09:41 AM.




m3post
Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2020, 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