UMI Motor Mounts in LS2 - LS1TECH



Cadillac CTS-V 2004-2007 (Gen I)
The Caddy with an Attitude...

View Poll Results: If you are running UMI mounts, report your engine and vibes!
LS6 (04-05 V) with UMI mounts- vibrations similar to stock/acceptable 5 38.46%
LS6 (04-05 V) with UMI mounts- vibrations UNACCEPTABLE 2 15.38%
LS2 (06-07 V) with UMI mounts- vibrations similar to stock/acceptable 2 15.38%
LS2 (06-07 V) with UMI mounts- vibrations UNACCEPTABLE 0 0%
None of the above, but I am hansdome/special and want to participate 4 30.77%
Voters: 13. You may not vote on this poll

UMI Motor Mounts in LS2

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Old 07-12-2012, 04:13 PM   #1
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Default UMI Motor Mounts in LS2

Gentlemen:

My ride is a 06 V, and I need motor mounts BADLY. I'm very interested in the UMI Mounts, but I see occasional complaints of unacceptable cabin noise/vibrations. It seems to me that most of those complaining of unacceptable vibrations have the LS2 engine.

I get that typical vibration at around 2K rpm, and at low speeds in parking lots, etc., the car vibrates so that my headliner buzzes. I don't want more of that kind of noise.

So I'm trying this poll thing here, if I can make it work. If you are running UMI mounts, please report to us the type of engine you have and if you have unacceptable vibrations or not.

Thanks brothas!

DAC

Last edited by DACTARI; 07-12-2012 at 04:19 PM.
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Old 07-12-2012, 04:57 PM   #2
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I'm handsome and special. I think.

Anyway, I'm glad you posted this poll. I've had the exact same question for a while. Now that my new camshaft is in, I can tell that my stock motor mounts are getting hammered a lot harder than usual and doubt they'll last a whole lot longer.
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Old 07-12-2012, 05:04 PM   #3
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you can notice a little in the drivers seat. nothing uncomfortable for a performance car.
from the passenger seat you cant notice
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Old 07-12-2012, 05:10 PM   #4
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Had to bump up the idle to 900RPM to eliminate the vehicle shake.

Also, picked up vibes in the cruise range, from 2,000-2,500 RPM.
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Old 07-12-2012, 06:12 PM   #5
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Had bad shakes below 950ish. I finally got rid of mine and picked up some used UUCs. Sung their praises at first but just grew old.
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Old 07-12-2012, 06:13 PM   #6
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I have an LS2 with headers. With the UMI mounts, I noticed a small amount of extra vibes and didn't really stress it. It only seemed to get worse after I changed out the trans mount with a CS mount.

With the UMI and CS mount, the vibes are pretty decent. With the stock trans mount, It didn't bother me much if at all.

There is vibes at around 2k-2500, just like mentioned above... I can live with it. Some people can't.
I haven't noticed any noticeable idle vibes... regardless of pre- or post-transmission mount change.
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Old 07-12-2012, 08:33 PM   #7
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Quote:
Originally Posted by odthetruth View Post
I have an LS2 with headers. With the UMI mounts, I noticed a small amount of extra vibes and didn't really stress it. It only seemed to get worse after I changed out the trans mount with a CS mount.

With the UMI and CS mount, the vibes are pretty decent. With the stock trans mount, It didn't bother me much if at all.

There is vibes at around 2k-2500, just like mentioned above... I can live with it. Some people can't.
I haven't noticed any noticeable idle vibes... regardless of pre- or post-transmission mount change.
Did you have the 2-2.5k vibes before the UMI mounts, but milder?
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Old 07-12-2012, 08:41 PM   #8
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Here you go. Did a poll about two months ago.
http://ls1tech.com/forums/cadillac-c...s-v1-poll.html
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Old 07-12-2012, 09:04 PM   #9
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i have my engine out of the car, and will be leaving the UMI's in when I put the new motor in. There's 0 vibration above 900ish RPM.
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Old 07-12-2012, 10:17 PM   #10
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Quote:
Originally Posted by dudesweet View Post
Here you go. Did a poll about two months ago.
http://ls1tech.com/forums/cadillac-c...s-v1-poll.html
Thanks buddy, I saw that and it was really helpful. I'm just tryi to figure out if the UMIs don't play well with the LS2.
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Old 07-12-2012, 10:40 PM   #11
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I hear you. That was my concern before I actually purchased the UMI mounts. Anything stiffer than stock will vibrate. But there's unbearable and mild. I'd say you're safe with UMI mounts.
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Old 07-13-2012, 05:31 AM   #12
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06 LS2 all stock, no mods at all.

Installed UMIs a few weeks ago. There is some noticeable vibration at low idle ... it's kind of like a harmonic.

But it's not at an RPM that is at normal operating speed ... only noticeable at idle.

It's a heckuva lot better than the clunking and banging from the stock units.
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Old 07-13-2012, 08:24 AM   #13
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You get used to the UNI mounts and then ”FORGET ABOUT IT!”
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Old 07-13-2012, 08:29 AM   #14
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Thanks all for your advice. I wet ahead and bought the UMI mounts.

I notice some of you didn't respond to the poll. Please do so for the V junkies of the future.
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Old 07-13-2012, 01:12 PM   #15
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Quote:
Originally Posted by Gabbiani View Post
Had bad shakes below 950ish. I finally got rid of mine and picked up some used UUCs. Sung their praises at first but just grew old.
Did you have vibes at 2000-2500 RPM? If so, did it go away with the UUC mounts?
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2007, cs, cts, ctsv, ls1, ls2, motor, mount, mounts, sierra, tech, trans, transmission, umi, vibration

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