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Suspension & Braking Forum by BimmerWorld
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Old 02-01-2016, 04:02 PM   #1
Weste46
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95a in diff. How much NVH?

Hello,

I'm looking to install some 95a diff bushings when rebuilding the rear end of my 330ci. I was wondering if anyone has personal experience on how much NVH these will cause. I'm not looking to do 75a as I've read Meyle HD bushings are of a similar durometer, and in that case I would probably prefer them for their resistance to permanent deformation (unless someone would like to chime in on the contrary.) I have M3 engine mounts, black UUC trans mounts, and am running 7.5 kg/mm front springs and will be running 9kg/mm rear once the rebuild is done. This should give you an idea of what I consider to be acceptable NVH.

Thank you for your time.
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Old 02-01-2016, 08:29 PM   #2
Rob43
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Ask yourself how much (realistically) your 95a RTAB's added in NVH.


I run 75D in that location.


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Old 02-01-2016, 10:26 PM   #3
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95a in diff. How much NVH?

I have 95a. Not bad. Noticeable, but I expected it would be worse.
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Last edited by Pole position; 02-01-2016 at 10:26 PM.
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Old 02-08-2016, 02:26 PM   #4
Weste46
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Originally Posted by Pole position View Post
I have 95a. Not bad. Noticeable, but I expected it would be worse.
Do you have any other drive train bushings like me to compare? I'm only worried about winter when my windows are up and I'm cruising at 70, I wouldn't want much more than what my black UUC trans bushings make honestly.
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Old 02-09-2016, 08:06 AM   #5
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Originally Posted by Weste46 View Post
Do you have any other drive train bushings like me to compare? I'm only worried about winter when my windows are up and I'm cruising at 70, I wouldn't want much more than what my black UUC trans bushings make honestly.
Not sure what durometer those trans bushings are, and it doesn't seem to be listed online. With 95A polyurethane, you might notice some more driveline feedback than you're used to. Probably not excessive, but it depends on many factors, including your personal tolerance. Is this a street-only car, or dual duty?

For what it's worth, I'm running 80A (Powerflex street - Purple) in my diff, and I'd say they're perfect. Car is dual duty, but unfortunately sees a lot more street duty than anything else lately.
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Old 02-10-2016, 07:35 PM   #6
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Originally Posted by Jonathan @ BimmerWorld View Post
Not sure what durometer those trans bushings are, and it doesn't seem to be listed online. With 95A polyurethane, you might notice some more driveline feedback than you're used to. Probably not excessive, but it depends on many factors, including your personal tolerance. Is this a street-only car, or dual duty?

For what it's worth, I'm running 80A (Powerflex street - Purple) in my diff, and I'd say they're perfect. Car is dual duty, but unfortunately sees a lot more street duty than anything else lately.
I am running the same diff bushes as you. What are you using for the subframe?
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Old 02-16-2016, 12:34 AM   #7
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Mine are loud, but that's because I have aluminum subframe bushings.
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Old 02-16-2016, 04:29 AM   #8
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Hmmmmm, well I'm planning on 75d subframe bushings, perhaps Meyle HD is what I should do for the diff in that case... Honestly I doubt my 330 has the power to benefit greatly in response with poly mounts, since it won't flex them as badly as an M3
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Old 02-16-2016, 04:30 AM   #9
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... Above a certain RPM, I mean... DISA valve be praised!
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Old 02-16-2016, 10:18 AM   #10
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Originally Posted by Weste46 View Post
Hmmmmm, well I'm planning on 75d subframe bushings, perhaps Meyle HD is what I should do for the diff in that case... Honestly I doubt my 330 has the power to benefit greatly in response with poly mounts, since it won't flex them as badly as an M3
A friend of mine has 75D in both his diff and subframe (E46 M3). I installed them and was surprised when we took it out for a drive. Really not too loud at all. Honestly, a lot has to do with the condition of your differential... some are just more noisy than others. I put in a 3.38 differential from an auto 330i into my car and it was noticeably louder. Hit or miss.

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Old 02-16-2016, 11:20 AM   #11
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I am running the same diff bushes as you. What are you using for the subframe?
I'm currently still on OEM subframe bushings that a previous owner took care of. Will likely need to do something later this year, though.
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Old 02-16-2016, 03:16 PM   #12
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I think once your spring rates get that high, you notice bushing harshness less and less. I have 7kg front with 9.5kg rear and bushings don't really show a difference anymore in the way of comfort. I have poly RTABs and Race Poly FCABs. Apart from jarring potholes, not really much difference
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