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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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06-12-2015, 12:40 PM | #25 | |
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06-12-2015, 12:43 PM | #26 | |
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06-12-2015, 12:45 PM | #27 |
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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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06-12-2015, 12:50 PM | #29 |
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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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06-12-2015, 12:56 PM | #31 | |
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06-12-2015, 01:06 PM | #32 |
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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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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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06-12-2015, 01:10 PM | #35 |
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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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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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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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08-07-2015, 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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