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      06-12-2015, 12:36 PM   #23
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The quality of the gear oil in the differential makes a very large difference. If the gear oil is old, or the incorrect type, it will make more noise.

The 6MT cars aren't very noisy at all, in fact it's hard to notice a lot of times. Some DCT cars have been a little more "whiny" than others.

It is true, I am working on a possible solution to reduce the whine noise which won't require any extensive work, and can be retrofitted easily.
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      06-12-2015, 12:38 PM   #24
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Quote:
Originally Posted by ashtaron14 View Post
I have had Solid Aluminum Subframe Mounts and Powerflex Purple Diff Bushings for about 5 months now.

Since my car was supercharged, when I am cruising and then I apply full throttle, the rear would strut down prior to launch. The solid mounts minimized that delay. There's not much diff whine since I didn't do the solid diff mounts. The whine of the Supercharger definitely covers the whine of that.
Never heard of the Powerflex ones, I'll look into that. Thanks
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      06-12-2015, 12:40 PM   #25
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Quote:
Originally Posted by Malek@MRF View Post
The quality of the gear oil in the differential makes a very large difference. If the gear oil is old, or the incorrect type, it will make more noise.

The 6MT cars aren't very noisy at all, in fact it's hard to notice a lot of times. Some DCT cars have been a little more "whiny" than others.

It is true, I am working on a possible solution to reduce the whine noise which won't require any extensive work, and can be retrofitted easily.
Thanks for chiming in Malek, I'm going to stick with the original plan. I highly doubt it will be too loud for me.
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      06-12-2015, 12:43 PM   #26
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Quote:
Originally Posted by 81bear View Post
Yes... Mrf subframe bushings an Derlin diff bushings.

Car's rear end feels more planted and it eliminates wheel hop which was the main reason I had them changed. Now when I change gears at 8000+ rpm the car lunges forward as opposed to hoping or braking traction.

Only negative is added noise in the cabin. It's loud so be prepared. I've been told that most, if not all, the added noise is from the diff bushings so keep that in mind before you install them.

If I were to do it again I'd probably just do the subframe bushings and see how they perform before doing the diff bushings.

Overall, I'm very happy with the performance just wish they weren't so loud...
I wonder how much it would change things if you did just do subframe bushing
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      06-12-2015, 12:45 PM   #27
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Quote:
Originally Posted by JEllis View Post
The opinions in this thread about the NVH produced from the diff bushings truly shows how subjective things can be. I don't notice them anymore. If you have an aftermarket exhaust or listen to the radio, your most likely not going to notice the sound.
I should have taken you for a ride in my car, J. I'm willing to wager you'd hear the glory of the diff whine.
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      06-12-2015, 12:46 PM   #28
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Quote:
Originally Posted by Malek@MRF View Post
The quality of the gear oil in the differential makes a very large difference. If the gear oil is old, or the incorrect type, it will make more noise.

The 6MT cars aren't very noisy at all, in fact it's hard to notice a lot of times. Some DCT cars have been a little more "whiny" than others.

It is true, I am working on a possible solution to reduce the whine noise which won't require any extensive work, and can be retrofitted easily.
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      06-12-2015, 12:50 PM   #29
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Quote:
Originally Posted by Hujan View Post
I should have taken you for a ride in my car, J. I'm willing to wager you'd hear the glory of the diff whine.
Maybe, I am also in the camp that likes the mechanical noise it makes.
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      06-12-2015, 12:56 PM   #30
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Quote:
Originally Posted by Lucrecio84 View Post
Never heard of the Powerflex ones, I'll look into that. Thanks
We installed Powerflex Subframe/Diff Bushings on okusa M3 which is aggressively tracked, shoot him a PM to get his feedback.
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      06-12-2015, 12:56 PM   #31
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Quote:
Originally Posted by Malek@MRF View Post
The quality of the gear oil in the differential makes a very large difference. If the gear oil is old, or the incorrect type, it will make more noise.

The 6MT cars aren't very noisy at all, in fact it's hard to notice a lot of times. Some DCT cars have been a little more "whiny" than others.

It is true, I am working on a possible solution to reduce the whine noise which won't require any extensive work, and can be retrofitted easily.
Harmonic damper off of an Xi?
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      06-12-2015, 01:06 PM   #32
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Quote:
Originally Posted by JEllis View Post
The opinions in this thread about the NVH produced from the diff bushings truly shows how subjective things can be. I don't notice them anymore. If you have an aftermarket exhaust or listen to the radio, your most likely not going to notice the sound.
I don't think it's just subjectivity I think the amount of NVH varies from car to car as well. And in that respect the only way OP will know if it's livable for him is by taking the plunge and experiencing it on his car first hand...
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      06-12-2015, 01:08 PM   #33
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Quote:
Originally Posted by 81bear View Post
I don't think it's just subjectivity I think the amount of NVH varies from car to car as well. And in that respect the only way OP will know if it's livable for him is by taking the plunge and experiencing it on his car first hand...
Agree with your points as well. But for some the whine is annoying while others like it or don't notice it all.
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      06-12-2015, 01:09 PM   #34
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Quote:
Originally Posted by Lucrecio84 View Post
I wonder how much it would change things if you did just do subframe bushing
So do I...

On a side note, I've been trying to contact Malek about this new option to reduce the diff whine so if you do get the skinny on these please share with the forum.
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      06-12-2015, 01:10 PM   #35
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Quote:
Originally Posted by 81bear View Post
So do I...

On a side note, I've been trying to contact Malek about this new option to reduce the diff whine so if you do get the skinny on these please share with the forum.
All the new Ms have solid subframes. It would not be noticeable much if at all. All , to be fair 99% of the NVH is from the solid diff bushings.
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      06-12-2015, 01:27 PM   #36
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Quote:
Originally Posted by Malek@MRF View Post
The quality of the gear oil in the differential makes a very large difference. If the gear oil is old, or the incorrect type, it will make more noise.

The 6MT cars aren't very noisy at all, in fact it's hard to notice a lot of times. Some DCT cars have been a little more "whiny" than others.

It is true, I am working on a possible solution to reduce the whine noise which won't require any extensive work, and can be retrofitted easily.
I totally missed this post, but I like it!

Any time frame for when these may be available?
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      06-12-2015, 02:07 PM   #37
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Some stock subframes on other BMWs have a bushing like nub sticking off the side, not attached to anything other than the subframe. Maybe something like that would absorb whine?
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      06-12-2015, 05:29 PM   #38
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Quote:
Originally Posted by tom @ eas View Post
We installed Powerflex Subframe/Diff Bushings on okusa M3 which is aggressively tracked, shoot him a PM to get his feedback.
Thanks Tom, I'll do that
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      08-06-2015, 07:03 PM   #39
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Change just the diff bushings back to something softer. Maybe Powerflex poly. Or maybe just replace the weakest mount with one from an M1.

I have hard red poly (75D) diff bushings in my E36M3 and the whine is pretty bad in the 2500-3500 rpm range. I would not want to do that to my E90M3.

A loud exhaust might make the sound less noticeable.
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      08-06-2015, 08:03 PM   #40
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DrFerry - I have Turner Solid Aluminum Subframe mounts and Powerflex Purple Diff mounts. It clucks and clangs (6MT) when I am in traffic or at parking speeds, but I don't hear diff whine (I've got Harrop Supercharger whine).

Someone on the forum had tried a CF Driveshaft but it doesn't deaden the diff whine, so your only option is to take off the Diff mounts.

I recommend Powerflex Purple.
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      08-06-2015, 08:12 PM   #41
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I'd give it a few months, not weeks, to get used to the whine. That's how long it's taken me to get desensitized to the whine. It's still, at times, over bearing but not nearly as noticeable as when I first had them installed. If after a few months you feel you still can't live with the bushings I'd replace the diff bushing to stock and see how that effects the nvh of the car.

Good luck and let us know how it goes.
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      08-06-2015, 08:16 PM   #42
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I may have hearing issue's but I don't think the whine is that loud, maybe because its a manual? Don't get me wrong its definitely there but with the windows down or music on, it is not noticeable at all.
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      08-06-2015, 08:33 PM   #43
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Do you have a stock exhaust?
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      08-07-2015, 07:53 AM   #44
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I was questioning whether those who say the whine is not so noticeable or objectionable have stock exhausts or louder aftermarket exhausts that may drown out some of the whine.
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