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08-06-2012, 06:39 PM | #67 |
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Me too. I am getting these installed in about 2 weeks.
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08-07-2012, 05:37 PM | #68 |
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Anyone planning to just install the diff bushings? Member tres mentioned that he installed the diff bushings and there is no increase in NVH. However, member italyix mentioned that the diff bushings is really bad in increased NVH. But italyix also install the subframe bushing at the same time. Want to see if there is a clear result on which bushings increase NVH the most.
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08-08-2012, 02:05 AM | #69 | |
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Looking forward to the updates after the subframe bushings installations
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08-09-2012, 02:45 PM | #70 | |
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08-09-2012, 03:45 PM | #71 |
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I replaced subframe bushings before on a previous RWD car and I remember that made a big difference in how the car felt. It also didn't really add any NVH to the car besides the rear feeling firmer. But in that case I used polyurethane bushings so it isn't as firm as a solid replacement.
Are there any firmer but not fully solid bushings that can be used on the M3? |
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08-11-2012, 01:52 AM | #72 | |
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08-13-2012, 11:12 PM | #73 | |
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I heard the GTS has solid subframe bushings (mounts) but have never seen a picture of them. I wonder if they are alloy, delrin or other? They are likely only available from BMW with the complete subframe. Re the M5, does anyone have pictures of the solid mounts? I should get under a new M5 to see if BMW employed any tricks to tame the NVH when using the solid subframe mounts. Maybe liquid-filled diff mounts IMO, any E9X M3 that is either driven hard and/or has more power than stock could really benefit from solid subframe mounts. My ESS VT2-625 kit made this issue far more obvious! |
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08-14-2012, 08:13 AM | #74 |
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I think BMW has said they use solid mounts in the M5. Don't think anyone is going to drop an F10 M5 subframe anytime soon though.
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08-14-2012, 01:21 PM | #75 |
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Interesting. At this point, it seem pretty much confirmed that the M3 GTS uses solid subframe bushings. The question I have is if the GTS frame has extra reenforcement at the locations where the subframe is mounted to to handle the solid subframe bushings? I can't seem to find any solid evident/confirmation for this. Any one want to charm in? I don't want to change to solid/derin bushings and later down the road find fractures/cracks on the frame instead. Thanks in advance.
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08-14-2012, 04:22 PM | #76 |
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Powerflex doesn't supply E9x M3. Someone said that ordinary E9x versions fit E9x M3, but Powerflex states clearly that their E9x BMW bushing does NOT fit to M3.
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08-14-2012, 04:55 PM | #77 | |
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08-14-2012, 04:58 PM | #78 |
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These would be my thoughts as well...
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08-14-2012, 05:12 PM | #79 |
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OK. I didn't check; just assumed they're the same size. Poly wouldn't be my choice anyway. If I were to firm up my subframe mounts from M3, the Motorsport bushings would be my choice.
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08-14-2012, 08:18 PM | #80 | |
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Skip to 2:54. I'll ask around about the GTS/CRT subframe mounts.
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08-15-2012, 03:49 PM | #81 |
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Dunno, this is pretty difficult. Metal is out, it's too hard without welding more reinforcement. Delrin is almost like metal; no go. Poly is hard and might work, but no one supply them. And Group N is rubber - racing rubber? How that is compared to OEM bushing? Any idea? Worth spending USD 800 to couple of bushes and find out that it's still rubber and far from hard plastics..?
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08-15-2012, 06:45 PM | #82 | |
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08-15-2012, 08:21 PM | #83 | |
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The chassis feels more connected to the subframe.
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08-15-2012, 09:31 PM | #84 |
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I think some poly or solid suspension bushings will not affect the ride comfort much. I wanna say the damper/spring relationship is the key to ride comfort. I might notice some more feel transmitted through the steering wheel with poly bushings. The squeaks might driving you crazy.
Driveline bushings will transmit a lot more NVH.
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08-16-2012, 01:03 PM | #85 |
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100% agree with this. My diff bushings are noisy...a constant whine, sounds like a motor winding up and down.
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08-16-2012, 01:31 PM | #86 | |
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Think of it as the bushings being welded in. I will also reiterate this, having solid sub-frame bushings will NOT degrade ride quality. This is what happens with solid driveline bushings (motor, transmission, differential).
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08-16-2012, 01:52 PM | #87 | |
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08-16-2012, 02:59 PM | #88 |
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So you can buy "solid rear" from BMW M and install it to your E92 DD? Does it fit, anybody knows? It's not even more much than group N bushing at USD 800.
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