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Old 01-29-2018, 11:10 AM   #26
undyjr
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Quote:
Originally Posted by MR2SW21 View Post
One thing that still concerns me though, since you guys mentioned my trans tailshaft moving quite large amount, is it normal?
I am little worry for just replacing the transmission mount (the trans force it the same) just now have the chassis to take the hit, something will need to give eventually.

Am I just putting a bandage on top a bandage, instead of really "fixing" the real issue?
I wouldn't worry about the chassis. The transmission cradle spreads the load quite well. Replacing the transmission mount was the best improvement I did in regards to cost, ease of installation, and perceptible gains. Noise vibration and harshness are subjective but the consensus is the group N mount is a fair compromise. I personally have the Perrin transmission mount with Whiteline bushings.
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Old 01-29-2018, 11:17 AM   #27
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Quote:
Originally Posted by MR2SW21 View Post
I stopped by my buddy's house today we have check all the mounts' bolts, they are all there and we are pretty sure they are tight.

Since everyone recommended group N for my case, hope it won't be too bad for NVH, I have read a lot of other reviews seem pretty extreme and subjective when people start judging about vibration and noises. Will report back after installed.
Virtually everything is subjective, especially when it comes to NVH. Some people can't stand the smallest amount of noise and some people are so deaf they can't ear a thing anyways.

Quote:
Originally Posted by n2oiroc
the tailshaft of your transmission is moving an insane amount. replace the stock transmission mount with part# D1010FE020, its a direct replacement and will not allow the tailshaft to flop around like a fish out of water.
This is what most people use to upgrade their transmission mount. Some people call it the GrpN mount, but others say that is the STi mount and not the GrpN mount.

When I looked up the durometer ratings before ( GrpN was slightly higher than STi ), they were so close I'm sure it doesn't make much difference, if any.

For me, the NVH issue was negligent. Couldn't really tell the difference from an NVH perspective but it was a worthwhile investment for tightening up the car.
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Old 01-29-2018, 12:18 PM   #28
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Besides the NVH is there any other possible issues after tighten up the car?

Is it possible after getting stiffer trans mount then need to upgrade the rear diff mount/bushing... etc....
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Old 01-29-2018, 12:54 PM   #29
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even if you don't have to..you should just do the whiteline bushing insert kit for the rear diff and rear subframe.

i just installed them on my car and they make a big difference. lol
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Old 01-29-2018, 01:08 PM   #30
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Installed the Group-N Transmission mount and the Whiteline bushings with it this weekend. I wish I had done so sooner because the car is an absolute joy to drive now. I had a strange clunking noise taking off in first gear and reverse before installing the Group-N mount but it completely disappeared after throwing on the new mount and bushings. I did notice that while removing the stock transmission mount, the two nuts secured onto the tranny mount were somewhat loose. I think that was the cause of clunking noise.
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Old 01-29-2018, 01:45 PM   #31
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Cool, good to know. Thanks guys.

Let see what happen after the group N mount along with the shift bushing and Cusco rear diff carrier along with the diff inserts installed.
Somehow I tend to go for the brand called SuperPro. (maybe because they are blue, I like color matching, lol)
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Old 01-29-2018, 02:38 PM   #32
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you are going to love the feel of the car, yet get ready for more cabin noise.. lol here is what mine looked like soon after install.. As you can see I also run the same GS pipe..




I like Super Pro as well:


image hosting for website

superpro LCA and bushings.. all my parts look nicely rusted.. New England snow salt.. those are while line and velox.. less than a year old (stainless steel on the rears.. rusted like crazy still)

Last edited by killadawg; 01-29-2018 at 02:47 PM.
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Old 01-29-2018, 02:59 PM   #33
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Quote:
Originally Posted by MR2SW21 View Post
Besides the NVH is there any other possible issues after tighten up the car?

Is it possible after getting stiffer trans mount then need to upgrade the rear diff mount/bushing... etc....
Not really. You'll just more easily pinpoint the other places that slop exists.

In terms of NVH, I get a little gear noise with a very stiff Beatrush transmission mount. Group N feels like stock in terms of vibration and still absorbs enough shock to keep everything safe.
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Old 01-29-2018, 04:08 PM   #34
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Quote:
Originally Posted by killadawg View Post
you are going to love the feel of the car, yet get ready for more cabin noise.. lol here is what mine looked like soon after install.. As you can see I also run the same GS pipe..




I like Super Pro as well:


image hosting for website

superpro LCA and bushings.. all my parts look nicely rusted.. New England snow salt.. those are while line and velox.. less than a year old (stainless steel on the rears.. rusted like crazy still)
Did you happen to get the mounting insert (for the two diff upper bolts) along with the Cusco diff carrier? Or you got something else?

Seem like you also have the IAG AOS as well ^_^ (I got the Crawford one, but still can't figure out how to get it install yet, LOL)

Your area is really rust like crazy... glad I am in no snow area, just get so darn hot in the summer.
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Old 01-29-2018, 04:17 PM   #35
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Quote:
Originally Posted by playslikepage71 View Post
Not really. You'll just more easily pinpoint the other places that slop exists.

In terms of NVH, I get a little gear noise with a very stiff Beatrush transmission mount. Group N feels like stock in terms of vibration and still absorbs enough shock to keep everything safe.
LOL, hope this won't become a starting point of endless upgrade.
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Old 01-29-2018, 04:34 PM   #36
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This is the first I'm hearing of a J-pipe banging without an upgraded transmission mount.

I mean the mount is cheap so its fine, just never heard of it until now.
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Old 01-29-2018, 05:05 PM   #37
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Quote:
Originally Posted by gn4rwhals View Post
This is the first I'm hearing of a J-pipe banging without an upgraded transmission mount.

I mean the mount is cheap so its fine, just never heard of it until now.
Happened to me, I just never made a post about it. It was fine for like 4 months before it started rattling with the stock mounts.
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Old 01-29-2018, 06:27 PM   #38
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Originally Posted by MR2SW21 View Post
Did you happen to get the mounting insert (for the two diff upper bolts) along with the Cusco diff carrier? Or you got something else?

Seem like you also have the IAG AOS as well ^_^ (I got the Crawford one, but still can't figure out how to get it install yet, LOL)

Your area is really rust like crazy... glad I am in no snow area, just get so darn hot in the summer.
Here is a half list.. https://wheelwell.com/killadawg-09-1...016-subaru-wrx

I have a storage unit full of parts to put on and also parts to sell.. never ending man... but I enjoy this, my crazy hobby. I do have inserts and even did the full Whiteline subframe bushings, not just the inserts, but the whole things (had to drill out the old ones.. sorry no pics, as my son was using my phone so I could work, and once it was on, there is not seeing them ;-)) much more solid, completely different car entirely. I took a ride in a stock one and it felt sooo sloppy it felt like I was in a SUV. good luck.
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Old 01-29-2018, 06:31 PM   #39
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Originally Posted by mishapopa View Post
Happened to me, I just never made a post about it. It was fine for like 4 months before it started rattling with the stock mounts.
Thank God, at least there's someone out there has the same issue.
When I e-mail to reach out for help, until I shown the video seem like it is not easy for people to believe what I said.

Then after showing the video, seem like I got a weird car or something. At least now I know that I am not alone.
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Old 01-29-2018, 06:38 PM   #40
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Originally Posted by killadawg View Post
Here is a half list.. https://wheelwell.com/killadawg-09-1...016-subaru-wrx

I have a storage unit full of parts to put on and also parts to sell.. never ending man... but I enjoy this, my crazy hobby. I do have inserts and even did the full Whiteline subframe bushings, not just the inserts, but the whole things (had to drill out the old ones.. sorry no pics, as my son was using my phone so I could work, and once it was on, there is not seeing them ;-)) much more solid, completely different car entirely. I took a ride in a stock one and it felt sooo sloppy it felt like I was in a SUV. good luck.
LOL, I heard ya, hope once I got my new toys installed, I will love my car more, :P

Thanks for all the advise.

Actually I don't mind to get more mods for fun and stuff, but just hate it when I need to mod because I need to "fix an issue" from a previous mod. LOL

Last edited by MR2SW21; 01-29-2018 at 06:43 PM.
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Old 01-30-2018, 11:51 AM   #41
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Quote:
Originally Posted by MR2SW21 View Post
Thank God, at least there's someone out there has the same issue.
When I e-mail to reach out for help, until I shown the video seem like it is not easy for people to believe what I said.

Then after showing the video, seem like I got a weird car or something. At least now I know that I am not alone.
Mine did it in 1st and reverse gear, every time when engaging the clutch. Since these 2 gears produce the highest torque output, they also create the most movement on the drive train. We've also gone from a 2.5" to a 3" exhaust so clearances are an issue.

Now I personally suggest doing all the mounts as so:
- Perrin engine mounts
- Group N tranny mount
- Group N pitch stop mount
- Perrin pitch stop bracket
- KDT 903, KDT 901 bushings/inserts

Pain in the ass and costs quite a bit but man the car feels way more connected and sturdy, best mods I've done without question. No noticeable NVH what-so-ever either other than a little bit of gear whine and when starting the car.

If not all the mounts, just do the transmission cross member bushings and the tranny mount. Rear diff inserts are nice too, surprisingly make a difference. But man, changing all the OEM mounts is the way to go.
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Old 01-30-2018, 03:31 PM   #42
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Oh Boy, just do some research for the installation.

Soooooo many people have different torque spec for the transmission mount and the bracket on youtube.

Some say
27 lb/ft for all 14mm at the transmission mount, the 14mm bolts on the bracket use 51lb/ft and 100lb/ft for the 17mm

also found this thread (very similar to what I saw on youtube)
http://forums.nasioc.com/forums/show....php?t=1334367

and very similar to this thread
http://forums.nasioc.com/forums/show....php?t=2426426

assuming 2002 and 2006 model torque spec is the same as 2017?

another say
impossible to get 100lb/ft for the 17 mm, 90lb/ft is the max
http://forums.nasioc.com/forums/show....php?t=2764776

so what is the correct one? I better ask before I make more damage to my car. Thanks all,
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Old 01-30-2018, 03:56 PM   #43
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https://www.perrin.com/images/products/PSP-DRV-150.pdf

I personally did the 17mm bolts good-n-tight. 100 is too much.
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Old 02-04-2018, 04:25 PM   #44
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If NVH is a concern you could always start with the Whiteline insert.

https://www.rallysportdirect.com/par...n-mount-insert
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Old 02-04-2018, 08:31 PM   #45
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Didn't know such thing exist, cool. But too late now, Group N with SuperPro bushing already ordered. This coming Wednesday will get them install. Will report back with a video after.
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Old 02-05-2018, 06:51 PM   #46
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Quote:
Originally Posted by MR2SW21 View Post
Didn't know such thing exist, cool. But too late now, Group N with SuperPro bushing already ordered. This coming Wednesday will get them install. Will report back with a video after.
I would grab the KDT903 rear diff inserts from whiteline as well. Very cheap and easy to install while further reducing drivetrain slop.
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Old 02-05-2018, 07:20 PM   #47
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I got something similar, also from SuperPro and Cusco diff carrier. Everything just delivered as I am typing this, can't wait for Wednesday to install them all. Hope this will take care of the issue and not creating a new one, LOL.
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Old 02-07-2018, 07:46 PM   #48
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Just go everything installed:

Group N trans mount, SuperPro cross member Isolator bushing, Cusco Diff carrier, SuperPro diff inserts.

http://drive.google.com/open?id=1V6N...9x6mVCekcaHK3c

Install was quite easy, after installed the GS J-pipe is actually closer to the transmission mount with the natural position like 1/16" (3/32" max) clear.

We ended up push the J-pipe toward to the center agin. Still closer than how it used to be, per my mechanic buddy, since the group N is a lot stiffer than the OEM when the transmission seats on the mount it doesn't compress like how it was, that's why the pipe is actually getting closer.

Any way, after everything installed, I have tested out. Seem like nothing is hitting. Will try to get another video later this week.

Hope the issue is been fixed.

Also for the most part I was super worry about NVH. Actually didn't feel any. Also didn't notice any different in terms of shifting, it is pretty much the same to me. Didn't get easier or harder. I thing I hear the syncro a little louder than it used to be (just very little) when I let go the throttle at 5k RPM at 2nd or 3rd gear don't really hear any gear whine either with window down. But any way, as long as fixed the hitting issue, I am happy already. Will report back again later this week.

I am not sure how stiff the Whitline bushing and inserts are. But seem like the SuperPro is not that stiff. (Well, it is surely stiffer than the OEM but not as stiff as I thought they would be.)
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Old 02-07-2018, 11:38 PM   #49
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Strange. The upgraded tranny mount with bushings and the rear diff inserts completely changed the feel of the car for me. The throttle response is a lot better after the installation and first to second is smooth as butter. The car is so much more enjoyable to drive. Do you have an upgraded pitch stop mount by chance?
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Old 02-08-2018, 01:00 AM   #50
MR2SW21
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Nope, I still have the OEM pitch stop.
Let me backup a little. Before the upgrade of trans mount, bushing, diff carrier and diff inserts. My car first and second is really smooth already. Easy in easy out, about power I do feel the throttle was really responsive back with OEM stuff. Therefore, I really don't feel anything got change, except a little louder when I shift in to third gear, I am pretty sure that is the syncro engage sound.

One thing I am sure when I video how much my trans and engine movement later this week. It shall be a lot less movement than how it was.

Only thing I didn't record back when the car was stock, I didn't capture a video of the diff move. (cause I wasn't expect to change anything for that, LOL)
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