x308 front lower subframe bushing poly option.
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x308 front lower subframe bushing poly option.
Hey guys, I have been looking for a poly front sub-frame bushing option on the x308. Has anyone come across such a thing or would anyone happen to have the dimensions of an uninstalled bushing that they could share. I'm exploring the idea of making bushings myself. Cheers
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Depends on your tastes. for an NA xj the bushings are just fine IMO. If your a more spirited driver with an XJR I think the car can greatly benefit from a more positive feel. If you've ever driven one of these cars with worn/torn subframe bushings, you can feel the entire front of the car shift under breaking or have steering play. It gets nearly dangerous; so longevity is a plus here as well. Alloy in the rear with the standard rubber v mount would most likely be a good compromise.
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Depends on your tastes. for an NA xj the bushings are just fine IMO. If your a more spirited driver with an XJR I think the car can greatly benefit from a more positive feel. If you've ever driven one of these cars with worn/torn subframe bushings, you can feel the entire front of the car shift under breaking or have steering play. It gets nearly dangerous; so longevity is a plus here as well. Alloy in the rear with the standard rubber v mount would most likely be a good compromise.
The only problem I see, is adding a lot more stress to the solid bolt but also to the mounting points of the frame AND the subframe. The rubber allowed it to flexibel to a specified degree. A solid aluminium or steel bush will prevent that and the results could be really nasty... But that is a COULD.
I have been told, that the racing X308s/X300s/X27s/... have their subframes welded in place to only allow movement of the wishbones and not the subframe.
Last edited by Daim; 03-16-2018 at 07:57 AM.
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Solid mounting subframes is very common in the Audi world as it transforms the steering feel and handing. I would only do it if you can convert the front mounts to solid too, otherwise you are just going to stress and fracture the mounting points in the body shell.
I would also like a poly solution, i changed all four mounts a year ago and already the two front v-blocks have separated and need replaced.
I would also like a poly solution, i changed all four mounts a year ago and already the two front v-blocks have separated and need replaced.
#13
Solid mounting subframes is very common in the Audi world as it transforms the steering feel and handing. I would only do it if you can convert the front mounts to solid too, otherwise you are just going to stress and fracture the mounting points in the body shell.
I would also like a poly solution, i changed all four mounts a year ago and already the two front v-blocks have separated and need replaced.
I would also like a poly solution, i changed all four mounts a year ago and already the two front v-blocks have separated and need replaced.
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The V blocks take a lot of stress. If you lift the car they are taking a good portion of weight. I just replace v blocks and have my old ones sitting by for R and D. I agree that solid rear mounting point would take the brunt of the stress which makes me lean towards poly. Also leaving the front mount oe allows for that mount to absorb small amounts of vibration and road surface. Being that the rear mount would then be more solid might keep the v mount from experiencing lateral movement potential stopping it from tearing as often. In theory anyway. Anyhow if anyone happens to have dimensions of the OD of that subframe mount it would be greatly appreciated. Keeps my car off my lift while I try and R&D a mount.
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If the vee's were the $25 priced ones they were probably URO, that particular part by that manufacturer is known to have longevity issues, bad rubber compound, rubber melting or cracking, etc. If they were in the $90-100 each they were probably OEM which should last a long time.
Another thing to keep in mind with making poly rear bushes is that they act as a centering part as well, not just handling forces perpendicular to the mounting bolt, so you need to make sure the inner mounting tube is centered depth-wise and will not slide around inside of the casting.
Another thing to keep in mind with making poly rear bushes is that they act as a centering part as well, not just handling forces perpendicular to the mounting bolt, so you need to make sure the inner mounting tube is centered depth-wise and will not slide around inside of the casting.
Last edited by nilanium; 03-16-2018 at 09:28 PM.
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It's a pay now or pay later situation .. The OE stuff does last typically 80-100k
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Reading this thread made me think about making poly bushings for the front shock mounts. Last year I had bought new shock mounts for the regular non cats dampers, of course I bought the cheap 25$ uro ones since I was going to throw them on the press and take off the bushings and switch them over to my original shock mounts with cats dampers. Sadly they're already rattling. I'm thinking I could get some clay I have to make the mold of the original bushings I saved and fill the molds to make new poly ones. Has anyone already done this with any luck?
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