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Suspension & Braking
Have some questions about suspension or brake setups for your E46 BMW? Get all your answers here!

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Old 11-07-2010, 02:43 PM   #1
InDiGlOM3
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TMS E46 M3 solid differential mounts

Does anyone have these? Im looking to upgrade mine because the front mount is starting to fail. My main concern is if I get these solid mounts will I have added noise in the cab? or does the subframe bushings block the noise still?
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Old 11-07-2010, 04:24 PM   #2
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Does anyone have these? Im looking to upgrade mine because the front mount is starting to fail. My main concern is if I get these solid mounts will I have added noise in the cab? or does the subframe bushings block the noise still?
I would just get OEM bushings again. Think how much abuse those bushings take especially with the power you make. All the energy your bushings absorb is going to be turned into vibration and noise. If it was a track-only car it would be one thing - but I'd never use solid bushings on a street car.
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Old 11-07-2010, 10:20 PM   #3
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I would just get OEM bushings again. Think how much abuse those bushings take especially with the power you make. All the energy your bushings absorb is going to be turned into vibration and noise. If it was a track-only car it would be one thing - but I'd never use solid bushings on a street car.
Frame that statement.
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Old 11-07-2010, 10:42 PM   #4
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PowerFlex 90A Bushing FTW!
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Old 11-08-2010, 09:18 AM   #5
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Powerflex from Bimmerworld.
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Old 11-08-2010, 11:58 AM   #6
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Powerflex makes a e46 m3 "DIff" bushing kit?? I couldnt find anything from them.
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Old 11-08-2010, 12:06 PM   #7
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Powerflex makes a e46 m3 "DIff" bushing kit?? I couldnt find anything from them.
Oh snap...overlooked it as for subframe

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Old 11-08-2010, 02:04 PM   #8
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Call up turner or bimmerworld...see what they are using????
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Old 11-08-2010, 02:35 PM   #9
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Powerflex makes a e46 m3 "DIff" bushing kit?? I couldnt find anything from them.
That's the mistake everyone keeps making - everyone thinks you're talking about your subframe.

Food for thought - I'm not sure what Turner and Bimmerworld run, but I know of at least one team who runs alongside them in Grand-Am that uses only rubber bushings on their BMW racecar. I, too, only use rubber bushings on my racecar with the exception of billet aluminum/delrin combo subframe bushings.

If racecars can get away just fine with rubber, it shows you that street cars really don't need any solid or polyurethane bushings. If I was going to upgrade any bushings in my street car to "solid," it would be the subframe bushings - and I'd replace them with the billet aluminum/delrin combos - just like my racecar. Everything else would be kept rubber - especially the "moving" bits like FCABS, RTABS, and Differential bushings.

I just don't see the advantage of polyurethane. I've had them and I didn't notice any discernible difference.

Ultimately, the call is yours, but I honestly don't see the benefit.

Just my opinion, though.

Good luck
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Last edited by FTWeisse; 11-08-2010 at 02:59 PM.
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Old 11-08-2010, 05:36 PM   #10
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Quote:
Originally Posted by FTWeisse View Post
That's the mistake everyone keeps making - everyone thinks you're talking about your subframe.

Food for thought - I'm not sure what Turner and Bimmerworld run, but I know of at least one team who runs alongside them in Grand-Am that uses only rubber bushings on their BMW racecar. I, too, only use rubber bushings on my racecar with the exception of billet aluminum/delrin combo subframe bushings.

If racecars can get away just fine with rubber, it shows you that street cars really don't need any solid or polyurethane bushings. If I was going to upgrade any bushings in my street car to "solid," it would be the subframe bushings - and I'd replace them with the billet aluminum/delrin combos - just like my racecar. Everything else would be kept rubber - especially the "moving" bits like FCABS, RTABS, and Differential bushings.

I just don't see the advantage of polyurethane. I've had them and I didn't notice any discernible difference.

Ultimately, the call is yours, but I honestly don't see the benefit.

Just my opinion, though.

Good luck
Its not really for the feeling or a notice in performance, just a wont go bad ever type of thing. My factory bushing, the center part got ripped free from the rubber.....so whats to say that wont happen again, the bushings isnt rotted at all so not sure why it happened. But I ordered the solid ones because Ive talked to a few others that say they dont hear it as long as the subframe bushings themselves arnt solid or delrin and they have the interior still in.
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