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Old 09-29-2004, 05:56 PM   #1
pearlblackWRX
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Default STI Motor & Tranny Mounts (noob)

What is the advantage to having these? I get a pretty heavy vibration from 4000 until 5000, Then the turbo kicks and its smooth til 6500. I also have noticable vibration in my gass pedal. How much is normal?
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Old 09-30-2004, 02:53 PM   #2
zaxrex
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Harder mounts will amplify the vibration that you are feeling. They are used to help isolate the engine and the trans from mooving around as much, tightening up the slack, and allowing a fraction of more torque to reach the wheels.

I don't know what havey vibration is, but it does not sound normal to me. time for a dealer
?
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Old 09-30-2004, 06:23 PM   #3
notraceready
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I was thinking of getting the mounts and did some searching over the past few days. Most people report positive results. Many of the folks liked the vibration they felt cause it's like having a big bad motor. Do you notice any upside to having the mounts like smoother shifting and better pickup at low rpms? Do you hear any other noises with the mounts in the cabin. Supposedly there is a clunk or something like that when decelerating.
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Old 09-30-2004, 07:44 PM   #4
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I put the mounts in about two months ago. Every day I go back and forth on if I should keep them in or take them out. I did lots of research here too, and most people said " a little increase in noise and vibration ". My experience is that it ALOT more noise and vibration. Before putting in the mounts, I had my car very quiet after sound deadening the whole interior, and going through most of the interior plastic panels and killing buzzes and vibrations. As soon as a put the mounts in, I heard more engine and tranny noise than I had before I did all the noise killing. An to top it off, now I have a whole bunch of new noises from the dash.

On the plus side, the car feels much more "hard core" and shifting is cleaner and there is almost no driveline lash.

If changing the mounts was a one hour job, I would put in the hard mounts for track days and use the stockers for everything else.

Just my opinion, your milage may vary
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Old 10-01-2004, 11:02 AM   #5
Kean
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Quote:
Originally Posted by fragment
I put the mounts in about two months ago. Every day I go back and forth on if I should keep them in or take them out. I did lots of research here too, and most people said " a little increase in noise and vibration ". My experience is that it ALOT more noise and vibration. Before putting in the mounts, I had my car very quiet after sound deadening the whole interior, and going through most of the interior plastic panels and killing buzzes and vibrations. As soon as a put the mounts in, I heard more engine and tranny noise than I had before I did all the noise killing. An to top it off, now I have a whole bunch of new noises from the dash.

On the plus side, the car feels much more "hard core" and shifting is cleaner and there is almost no driveline lash.

If changing the mounts was a one hour job, I would put in the hard mounts for track days and use the stockers for everything else.

Just my opinion, your milage may vary
I've debated installing these for the very reasons you mentioned. I guess the amount of noise/vibration is relative. .....some may think it's "too much" while others may feel it's only "a little".
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Old 10-01-2004, 11:10 AM   #6
zaxrex
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For me, installing the tranny mount was the single cheepest mod with the most positive effect I have had yet. Compared with the noise and vibration from coilovers, the tranny mount had only positive feel and performance results.
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Old 10-01-2004, 01:38 PM   #7
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Quote:
Originally Posted by notraceready
I was thinking of getting the mounts and did some searching over the past few days. Most people report positive results. Many of the folks liked the vibration they felt cause it's like having a big bad motor. Do you notice any upside to having the mounts like smoother shifting and better pickup at low rpms? Do you hear any other noises with the mounts in the cabin. Supposedly there is a clunk or something like that when decelerating.
My WRX has Grp N tranny and engine mounts. I have never felt a clunk when decelerating.
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Old 10-01-2004, 02:52 PM   #8
rankink
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I have the Sti engine and tranny mounts. No clunk when decelerating ever. I do have increase vibration in the car, expecially when the AC compressor cycles on. It is too much? It all depends on what your threshold level is for that. For me, any more and it would get annoying. I put them in because I noticed as I developed more power with the engine the stock mounts were getting softer and more worn. Now, it feels more responsive to the power and I feel more connected with the car. This is still very minor really, so don't expect a night a day feel with them.
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Old 10-01-2004, 03:48 PM   #9
ride5000
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if you want to be more connected to what the engine is doing--in both a good and bad way--then put 'em in.

i love mine.

jm2c
ken
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Old 10-01-2004, 03:50 PM   #10
notraceready
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I'm also rethinking whether I want to install the mounts now. I already have some noises like fragment reports but they're not real noticeable. I had dynomat put on the door panals and in the ceiling for my stereo and to combate road noise so I'm thinking the mounts might negate the effects of that. Overall, I think my cabins fairly quiet and I like that. But I'd also like the "feel good" effect.... wish i could try them and then decide.
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Old 10-01-2004, 04:47 PM   #11
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I'm getting a lot of tranny/engine block movement on hard shifts... you think both the trans & motor mounts would cure this? I could care less about more noise as my car is f'ing loud already.
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Old 10-01-2004, 05:37 PM   #12
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your attempt to deaden sound indicates priorities counter to significant drivetrain/suspension performance increases--don't do it! I have group-N pitch-stop, trans/engine mounts, st-shifter, and all four suspension top-hats. Noisy as hell, but tolerable--even by my significant other.
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Old 10-01-2004, 09:30 PM   #13
Equilibrium Tuning
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I added grp-n tranny, motor, and pitch stop mounts. Although there was a slight increase in engine noise in certain RPM regions, the solid feel they added is completely worth it. The wrx drivetrain is very sloppy to begin with and after watching my engine jump around on the dyno, I immediately got the new mounts. Shifting is much better and driveline lash is reduced significantly.

-- Ed
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Old 10-02-2004, 11:02 AM   #14
notraceready
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I've gained alot of insight from this thread and others I've researched. I just found out that a shop in St. Louis will do the install for 75 bucks. I think that sounds really reasonable. I think I'll try the mounts and if I can't stand the noise I'll pay to have the OE put back on. I'll post back with my thoughts. Only thing is, the vendors I've checked with are out of them right now.
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Old 10-02-2004, 01:24 PM   #15
InfamousDX
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Quote:
Originally Posted by Vaus
I added grp-n tranny, motor, and pitch stop mounts. Although there was a slight increase in engine noise in certain RPM regions, the solid feel they added is completely worth it. The wrx drivetrain is very sloppy to begin with and after watching my engine jump around on the dyno, I immediately got the new mounts. Shifting is much better and driveline lash is reduced significantly.

-- Ed
That's exactly my dilemma... the motor has too much movement and driveline lash is exactly the words to describe it when hard shifting. I guess I'm in store for the 4 mounts then.
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Old 10-02-2004, 01:32 PM   #16
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Quote:
Originally Posted by InfamousDX
That's exactly my dilemma... the motor has too much movement and driveline lash is exactly the words to describe it when hard shifting. I guess I'm in store for the 4 mounts then.
Get them. . you'll love them once you have them in. Also, you don't need the dogbone pitch mount. It doesn't do much. Just get the engine and tranny mounts and you'll be fine.

Calvin
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Old 10-02-2004, 03:31 PM   #17
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Quote:
Originally Posted by cnk
Also, you don't need the dogbone pitch mount. It doesn't do much. Just get the engine and tranny mounts and you'll be fine.

Calvin
You don't NEED the pitch mount, but it does make a bit of a difference. It was the last mount I put in and I deffinately felt a slight improvement. Its cheap too

-- Ed
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Old 10-02-2004, 06:21 PM   #18
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Thanks both Ed and Calvin... I'll be sure to put my Subie bucks to good use now!
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