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      12-16-2020, 08:31 PM   #1
redefine.m3
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Rear subframe bushings & rear differential bushing/mounts

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Last edited by redefine.m3; 03-15-2022 at 05:57 PM..
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      12-23-2020, 09:06 AM   #2
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1M/M3 rear subframe bushings fit the 135. Curious why you're looking at the solid aluminum bushings. I have no experience with them but I'd be worried about NVH with those. If the car is more track focused I'd do solid aluminum. I have Whiteline 2 piece bushings in my car and very happy with the results. It's the best mod I've done to my car and I've done a lot. Zero increase in NVH and got rid of 90% of the slop in the rear end. Why new diff bushings ?
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      12-23-2020, 09:17 AM   #3
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https://www.condorspeedshop.com/coll...ucts/e90-combo
This looks like a great option.
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      12-23-2020, 12:11 PM   #4
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Is this a track car?
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      12-23-2020, 12:11 PM   #5
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Most threads/conversations I've read indicate Sub Frame Bushings usually have 0/no impact on NVH, and people that have done solid aluminum will confirm that.

Differential bushings do add considerable NVH though, would be weary of going too stiff on those if you don't really need it/want to deal with an increase in that much cabin noise.

I've only done the 2-piece whiteline subframe bushings though and can't offer more personal input than that.
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      12-23-2020, 03:07 PM   #6
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Quote:
Originally Posted by fast1eddy View Post
1M/M3 rear subframe bushings fit the 135. Curious why you're looking at the solid aluminum bushings. I have no experience with them but I'd be worried about NVH with those. If the car is more track focused I'd do solid aluminum. I have Whiteline 2 piece bushings in my car and very happy with the results. It's the best mod I've done to my car and I've done a lot. Zero increase in NVH and got rid of 90% of the slop in the rear end. Why new diff bushings ?
Do you know if the 1M/M3 differential bushings will fit the 135i subframe as well?

Being a 10 year old car now with stock bushings, I would imagine they're long overdue for a refresh. I have mixed opinions on m3 bushings, there are people who suggest the Whiteline/Powerflex bushings which is "good enough" and for less increase in NVH. There are also people who say they have little to no increase in NVH with solid bushings. I'm looking for more of quality, longevity and readiness if I decide to track the car often. So I'm on the fence with either Turner solid bushings or Powerflex Black/Performance Series bushings which is slightly less costly. I'm not too familiar with Whiteline but I know Powerflex is one of the more popular one which gives me a bit more buying confidence, should I decide on that over Turner bushings. Waiting on further feedback before I make the purchase end of this month!

Last edited by redefine.m3; 12-23-2020 at 04:30 PM..
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      12-23-2020, 03:10 PM   #7
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Originally Posted by Thunderguts View Post
Is this a track car?
Daily driver with some track days during the Summer season
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      12-23-2020, 03:25 PM   #8
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Quote:
Originally Posted by dtla1 View Post
Most threads/conversations I've read indicate Sub Frame Bushings usually have 0/no impact on NVH, and people that have done solid aluminum will confirm that.

Differential bushings do add considerable NVH though, would be weary of going too stiff on those if you don't really need it/want to deal with an increase in that much cabin noise.

I've only done the 2-piece whiteline subframe bushings though and can't offer more personal input than that.
If that's the case, I will go with solids for my rear subframe bushings and poly for my differential bushings. Thanks!
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      12-23-2020, 04:13 PM   #9
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Quote:
Originally Posted by redefine.e82 View Post
Daily driver with some track days during the Summer season
In that case, let us know how it goes. I'm planning to drop my subframe sometime in the next year and replace everything. I was going to use M3 bushings everywhere, including the diff, but maybe poly bushings might not be too harsh for street use.
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      12-23-2020, 08:42 PM   #10
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I would suggest doing more research. NVH tolerance is a subjective thing. Most seem to accept that poly or even solid RSFBs are acceptable. The Diff bushing though, I would say stick to a rubber or upgraded rubber part for a car that is street driven. Recall reading several posts about noticeable NVH increases with a poly diff bushing.
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      12-23-2020, 09:39 PM   #11
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Do not waste your time/money on M3 subframe bushings. Go solid/delrin or high durometer PU - 2 piece designs are very easy to install so that's a definitive consideration when choosing a set. Solid subframe bushings have almost 0 increase in NVH. I had solid subframe bushings in a 135i and didn't notice a difference in NVH from stock bushings.

Diff, trans and engine mounts make big differences for NVH. My E92 has solid diff and subframe bushings and the solid diff bushings are very noticeable. Depending on your application keep that in mind. Something in the 75-80A range for diffs mounts would be as stiff as I would go if you plan on driving the car on street often - same goes for trans mounts.
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      12-23-2020, 09:47 PM   #12
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Whiteline sells subframe and diff bushings for the E82, both are 75A. The subframe bushings are 2-piece, so easy to install. They are very reasonably price and offer a good option for people driving cars daily but want increased performance.

I'd still suggest solid subframe bushings, as there are very few downsides (other then more difficult to install and more expensive then something like the Whitelines).
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      12-24-2020, 01:57 AM   #13
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So it seems like the best option to go with for rear subframe bushings are the Turner Delrin/Aluminum Rear Subframe Bushing Set, it adds VERY minimal NVH. The Poly differential bushings will add some noticeable NVH. There are more people who have had better experience with the Whiteline differential bushings with less added NVH over the poly options. Do anyone know of anything better than the Whitelines that they know of without increasing noise as much as the poly bushings do?

Last edited by redefine.m3; 12-24-2020 at 02:04 AM..
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      12-28-2020, 10:23 AM   #14
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Quote:
Originally Posted by asbrr View Post
I would suggest doing more research. NVH tolerance is a subjective thing. Most seem to accept that poly or even solid RSFBs are acceptable. The Diff bushing though, I would say stick to a rubber or upgraded rubber part for a car that is street driven. Recall reading several posts about noticeable NVH increases with a poly diff bushing.
I've read the same, anything stiffer on the diff bushings and the NVH increase is quite considerable.
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      12-28-2020, 10:39 AM   #15
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I installed the RSFB insets & rear diff brace that I bought from a forum member. Locked down the rear nicely and not much difference in NVH in my opinion.
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      12-28-2020, 11:19 AM   #16
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I did the M3 RSFB's, at the time they were really the only option. Totally solved the snappy rubber band rear thing and gave 0 additional NVH.

I'm not trying to say those are the ones you should go with, just FYI as a data point.
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      12-30-2020, 10:31 AM   #17
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I've heard really good things about the Condor rear subframe bushings. No NVH increase as the uhmw material absorbs vibration while staying solid. I bought them but just haven't gotten around to installing them yet.

https://www.condorspeedshop.com/coll...me-bushing-kit
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      12-30-2020, 12:00 PM   #18
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So here's my bushing question: how do inserts rank in stiffness next to a replacement bushing?

So lets say you added Powerflex Black Race inserts to your stock bushings. How much softer is that then 2-piece Yellow street full poly bushings? There's still a lot of rubber in the stock bushings so I'm not sure how much difference a black insert makes over a yellow insert and how that compares to a replacement 2-piece bushing.

Is a stock bushing with a yellow street insert going to be stiffer than an M3 bushing?

I'm reevaluating my options. The inserts are cheap enough that I may try the black race inserts with the stock bushings. If I don't like them, I can always replace the full bushing later. For the other bushings, I think I prefer to go with the M3, especially the differential bushings.
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      12-30-2020, 12:33 PM   #19
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I've never driven a 1er with M or solid bushings, but, I can say the inserts are an improvement over stock. Probably somewhat depends on how beat up your stock bushings are. Relatively easy install and the inserts are inexpensive.

I don't think there is any way stock bushings with inserts will be as stiff as 1M bushings just looking at pictures of the bushings and the void space.
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      12-30-2020, 01:04 PM   #20
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Quote:
Originally Posted by gjm120 View Post
I don't think there is any way stock bushings with inserts will be as stiff as 1M bushings just looking at pictures of the bushings and the void space.
That's what I'm afraid of. Granted it's no big loss if I try inserts and I'm not satisfied, but I'd rather get it right the first time.
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      12-30-2020, 01:16 PM   #21
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Quote:
Originally Posted by Thunderguts View Post
That's what I'm afraid of. Granted it's no big loss if I try inserts and I'm not satisfied, but I'd rather get it right the first time.
My 2 cents: I had the inserts and really didn't notice any difference. Wish I would've gone with the M3 bushings or something other than the inserts.

I dunno, maybe my butt's not as sensitive as others. lol
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      12-30-2020, 01:18 PM   #22
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Quote:
Originally Posted by Thunderguts View Post
That's what I'm afraid of. Granted it's no big loss if I try inserts and I'm not satisfied, but I'd rather get it right the first time.
I think I'd recommend you swallow the big one time labour cost and do full bushings if you're planning to keep the car a long time - otherwise it will always be in the back of your mind I feel. I've had 2 piece Whitelines in my car for over 100K kms and they are fine/no issues so far.
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