im looking at installing some rear subframe mounts, and some trailing arm bushings. does anyone know much about urethane? i dont want it to be to hard on the chassis because its an 85. also what is the ride like? im running on H&R sports with bilistien shocks. what about sway bar busings? does urethane sway bar bushings make a big difference? thnks.
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uhh, it's made of polyurethane instead of rubber, and uhh it's kinda plasticy and stuff :P
seriously though, your chassis will be fine. urethane isn't *that* hard, I've driven 12,000 miles so far on mine and I only vibrated one part of my car loose. ;)
I still have my old stock rubber bushings, of course the rest of my rubber was still in decent shape so I'm not too worried, they'll be replaced whenever I get a new swaybar anyway.
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Re: urethane bushings
Originally posted by christophbmwim looking at installing some rear subframe mounts, and some trailing arm bushings. does anyone know much about urethane? i dont want it to be to hard on the chassis because its an 85. also what is the ride like? im running on H&R sports with bilistien shocks. what about sway bar busings? does urethane sway bar bushings make a big difference? thnks.past:
1989 325is (learner shitbox)
1986 325e (turbo dorito)
1991 318ic (5-lug ITB)
1985 323i baur
current:
1995 M3 (suspension, 17x9/255-40, borla)
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I look at urethane as being more of a performance addition, rather than something used for reliability and longetivity. Mainly because of the fact that you're going to have to grease them again before you would have to replace a rubber bushing. But they are much easier to install because you do not need a press. Also, you may have some squeeking or creeking occasionally on break in. I still have a creeking noise at very low speeds going over bumps with my subframe bushings.-Brandon
'86 325es S50
'12 VW GTI Autobahn DSG
'03 540i M-Sport (sold)
'08 Jeep SRT-8 (sold)
For sale:
S50 TMS chip for Schricks
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My M3 is all urathane... and its squeaks a LOT and has additional vibrations. if I did it again, I wouldn't do the subframe bushings in urathane as I think that adds a lot of the noice/vibes to the rear-end...'88 M3.2 S54 Lachssilber/Black
'07 335i Alpine/Black Sedan
'12 X5 3.5i Alpine/Black
iS Splitters For Sale, PM ME!
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Originally posted by BrysonI have no extra noise or vibrations in the rear end with my urethane subframe bushings, no squeaking either, I have the IE ones paired with factory rubber trailing arm bushings... that might be everybody's problemIm now E30less.
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Originally posted by BrysonI have no extra noise or vibrations in the rear end with my urethane subframe bushings, no squeaking either, I have the IE ones paired with factory rubber trailing arm bushings... that might be everybody's problem-Brandon
'86 325es S50
'12 VW GTI Autobahn DSG
'03 540i M-Sport (sold)
'08 Jeep SRT-8 (sold)
For sale:
S50 TMS chip for Schricks
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A little trivia for you guys - Rubber bushings are designed to twist. That's why they are silent, and the control arm bushings have to be installed with a temporary lube, like soap. Once the soap dries, the rubber 'sticks' to both parts.
Urethane is different in that it is not designed to twist. That's why you install them with grease. Over time, the grease gets squeezed out and they start squeeking.
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yeah I have one, skip the diff mount. It's a PITA to put in and it's not much stiffer than a new factory peice, plus it doesn't fit all that well. Spend the money on a new cover (M coupe) intstead, it comes with a new bushing and you can put it on with hand tools (you need a press for the diff bushing, which requires you to remove the cover anyway)..
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