Installed Uuc Tme's, Vibration Problems! - BMW Forum - BimmerWerkz.com
3-Series (E36) Chat relating to the BMW 3-Series from 1992-1999. Autodoodad Specific models include: BMW 316i, BMW 318i, BMW 318iS/ti, BMW 320, BMW 323, BMW 320, BMW 324, BMW 325, BMW 328.

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#1 (permalink) Old 10-12-2004, 01:04 PM
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Hey guys,

I just installed my UUC TME's (red bushings) and I'm getting A LOT of vibration, especially at lower RPM's. Cruising on the highway I can barely see my rearview side mirrors because they shake so much.

I torqued all nuts and bolts to the manual spec 16lbs/ft, I did this with the tranny jacked up so there was no load on the bushings. I removed it several times to retorque it and each time the same result. The vibration is unacceptable. Many people I know have them installed and their cars barely vibrate at all. Am I doing something wrong?

The only tranny mods I have are the 96+ M3 clutch, pressure plate and flywheel. I have a '94 318.

Should I try using a lower torque spec?

Thanks,

Bryan

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#2 (permalink) Old 10-12-2004, 08:54 PM
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I would try a lower torque spec... first....

Does this bushing fall along the same strength as the others?... It is obviously transfering your tranny vib to your frame...

With no pressure you have torqued those bolts to the spec... I'd lower the tranny.. and let those bolts out a little... tighten them with weight on the tranny... Not so tight it will kill you to remove.. but tight enough not to fall off... inbetween the two...

I've heard of a slight vib before... mainly in the lower RPM range such as yours.. but nothing bad enough to be annoying... let a lone as harsh as you say...

Trying anything right now wont hurt it.. just be sure you are shifting in the right place... as to not move that tranny all that much...

Also a lot of mustang guys I work with hand tighten.. then lower the tranny... then hand tighten with a wrench.. then drive for a while.. then tighten again.. they do that a few times.. and they are done... I dont exactly know that method.. or why they do it.. but its pretty popular in the mustang group...

Good Luck

Les


1997 E36 M3 1990 E30 325i
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#3 (permalink) Old 10-12-2004, 09:00 PM
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Thanks for the info.

I think maybe the bushings expand after using them for a while. So after breaking them in they just retorque or retighten all the bolts/nuts. I'm going to try what you said, just hand tighten with the full weight of the tranny weighing down on the brace. I tried to loosen the bolts earlier today and burned myself ghead smart. I have to wait an hour or more inbetween each time I test drive the car. What a pain.

Hopefully my problems will be solved.

Thanks,

Bry

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#4 (permalink) Old 10-12-2004, 09:04 PM
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No problem... I've found a long sleeve shirt.. and a good pair of mech gloves helps when dealing with a running engine...

Think about it this way... if you tighten them to 16ft/lbs with no weight on them.. then add the tranny... you are pretty much increasing that spec by the tranny.. to a degree of course... but still.. its has the pressure of the tranny on it.. plus the 16 you put on there... that would transfer a little more vib than normal in my mind...

If what I said doesnt work.. I'd call UUC.. and talk to them.. sometimes its the little things that you over look.. and its amazing how often that happens...

Good Luck

Les


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#5 (permalink) Old 10-12-2004, 09:21 PM
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Originally posted by 97alpineM3@Oct 12 2004, 08:04 PM
No problem... I've found a long sleeve shirt.. and a good pair of mech gloves helps when dealing with a running engine...

Think about it this way... if you tighten them to 16ft/lbs with no weight on them.. then add the tranny... you are pretty much increasing that spec by the tranny.. to a degree of course... but still.. its has the pressure of the tranny on it.. plus the 16 you put on there...* that would transfer a little more vib than normal in my mind...*

If what I said doesnt work.. I'd call UUC.. and talk to them.. sometimes its the little things that you over look.. and its amazing how often that happens...

Good Luck

Les
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I was just talking to another friend of mine. He says the torque specs will actually decrease with preload. So that means I should tighten even more now with the tranny fully weighing down on the brace. Anyways, I hate crawling under the car, but I guess it has to be done

Thanks,

bry

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#6 (permalink) Old 10-12-2004, 09:24 PM
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Thats interesting... maybe I have them mixed up.... tell me how it works man...

Thanks,

Les


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#7 (permalink) Old 10-12-2004, 09:25 PM
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Mine took around 500 miles to break in and had quite a bit of vibration while accelerating. 75 mph in 4th gear = my cure all for tranny mounts.

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#8 (permalink) Old 10-12-2004, 09:31 PM
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Originally posted by Kevin325i@Oct 12 2004, 08:25 PM
Mine took around 500 miles to break in and had quite a bit of vibration while accelerating. 75 mph in 4th gear = my cure all for tranny mounts.
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You have to break them in? They are made of urethane aren't they? I don't think there is any expansion or compression unless you use rubber? I could be wrong. Are you using the black rubber bushings as opposed to the red urethane ones?

Everyone I've known who has had them installed had no vibrations the first time around.

Bry

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#9 (permalink) Old 10-12-2004, 09:41 PM
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What it was was actually them loosening on the bolt a little bit then I had to retorque them. They're the reds with enforcers.

In my case I think the breaking is was the bushing working the grease I lubed the TME with to slide it on.

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#10 (permalink) Old 10-12-2004, 09:44 PM
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Quote:
Originally posted by Kevin325i@Oct 12 2004, 08:41 PM
What it was was actually them loosening on the bolt a little bit then I had to retorque them. They're the reds with enforcers.

In my case I think the breaking is was the bushing working the grease I lubed the TME with to slide it on.
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Ok nvm, the red ones are rubber too. How bad were the vibrations?

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#11 (permalink) Old 10-12-2004, 09:52 PM
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Light massage chair? Hard to describe, it was mostly noise though.

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#12 (permalink) Old 10-13-2004, 03:20 PM
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I couldn't figure out what the heck was wrong with them. I removed them and I just ordered E21 320i mounts from BMW. I'm just going to use those with my UUC tranny mount enforcers. They're comming in tomorrow so hopfully that will solve my vibration issues.

I did notice one thing. One of the 4 bolts that hold my tranny brace to the chassis was stripped. I called my mechanic and he says that it's a common problem, but it won't be the cause of the vibrations. Anyways, if I were to go about repairing this, what should I do? I've thought of drilling a bigger hole into the striped threads and using an expanding rivet nut like the ones used on the x-brace. Any ideas?

Anyways, I was just thinking that UUC doesn't like my 318. The red bushings are probably too stiff. The UUC clutch stop didn't work with my car either.

Thanks,

Bry

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#13 (permalink) Old 10-14-2004, 01:21 AM
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i didn't really notice any need for break-in for my UUC mounts (red) and TMEs.

one thing to consider is maybe you already had an inherent balance issue with your new flywheel/plate/clutch assembly that wasn't noticeable with the stock mounts, but the addition of the UUC parts just made the NVH more noticeable?

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#14 (permalink) Old 10-14-2004, 07:00 AM
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I have the Red mounts and found the vibration very annoying, no matter what torque spec I used. The problem is by using the bushing with the reinforcer cups it effectively locks the bushing into a shorter length acually stiffening it.

The solution for me was to NOT use the reinforcer cups, it still was way tighter than stock and the vibrations disappeared. I checked with UUC and they said that it was ok to do and will have no ill effect on the vehicle.

98 328is Sport Package M3-Spoiler and Front End,

Turner Motorsports 4 Wheel drilled Rotors.
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#15 (permalink) Old 10-14-2004, 10:28 AM
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Originally posted by DesmoBob@Oct 14 2004, 12:21 AM
i didn't really notice any need for break-in for my UUC mounts (red) and TMEs.

one thing to consider is maybe you already had an inherent balance issue with your new flywheel/plate/clutch assembly that wasn't noticeable with the stock mounts, but the addition of the UUC parts just made the NVH more noticeable?
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I was thinking the exact same thing.

<u>1994 M-Technic M42 Saloon - Trillium Chapter - 5130</u>
Stock - 2866lbs Current - 2670lbs
<a href='http://www.geocities.com/mtechnik42' target='_blank'>- VIEW MY MODS AND PICS</a>
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