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Old 07-26-2007, 06:33 PM   #26
flycaster
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Typical gear lash noise. You put in a lighter flywheel and an aftermarket clutch with smaller dampners, and voila, you now have less mass to absorb the NVH coming out of the tranny.
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Old 02-09-2008, 07:35 PM   #27
ryeguy
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So I have the same issue, but mine only seems to make the rattle/grind in 2nd and 3rd gear, when decelerating, around 2500-3500 rpm.....any thoughts? If this is NORMAL, then a OEM clutch and flywheel are going back in, I really don't notice the difference in the lightened flywheel....
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Old 02-14-2008, 12:58 AM   #28
gaby
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Same problem here I swap the block for a 2.5 installed new clutch and lightweight flywheel and it rattle on decel from 3500-2500 on any gear. Anyone felt a difference with different tire psi?
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Old 02-14-2008, 12:59 AM   #29
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double post.
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Old 02-17-2008, 01:01 PM   #30
Beanboy
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Glad I found this thread. LGT with ACT streetlight clutch kit installed. Went from 28 pound dual mass down to the 14 pound (I think) lightweight street flywheel. Noise mostly heard in 2nd/3rd decel from above 2000-3000RPM. Also sounds like somebody trying to shift into first from a stop without the clutch, hehe. In other words, bad!

Mine isn't as loud as the video and I was a bit concerned. Sounds like others have similar issues.
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Old 02-17-2008, 02:20 PM   #31
gaby
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I have now a 4psi diference between front and rear tires and the noise is 70% out. Before it was making that noise @ 4000-2500rpms. Now is way less and only from 2500-2000rpms. I got a 6 puck disk exedy pp and 11pd flywheel on a jdm 6spd tranny.
Note if you put a 7psi difference or more your lsd will make a clikkk noise when making slow turns.
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Old 02-17-2008, 03:01 PM   #32
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Hmm.. cool. My video still works. Hehe.

Well my car has about 94k miles now, and still no problems. I have deemed the noise normal. The only real problem I do have is that my friend didn't tighten my starter bolts enough, so I have a 4-5" section of flywheel teeth stripped on my $450 cusco flywheel.

Shoulda double checked it myself. Bastard. Oh well.

Car still drives like a beauty!

Weird thing is, my car seems to rev much faster in the video, then now. Maybe mileage has gotten to my motor, and it's not quite as peppy. Sure beats the stock flywheel though. muhaha.
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Old 05-05-2008, 11:28 AM   #33
xstuning
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Thank god people have the same problem lol. I was ready to rip this car apart
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Old 05-05-2008, 09:57 PM   #34
caterpill
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I still love my subaru.

I just hated doing valvecover gaskets. BLAH!
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Old 02-10-2009, 01:00 AM   #35
unclemat
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Bump. Interestingly I got the decel noise (2k-3k range mostly) with stock STI fly and ACT HDSS clutch on my LGT w/6-speed swap. Did not expect to have that with stock fly
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Old 02-28-2009, 10:39 PM   #36
mmaurini
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Same noise here with lighter flywheel and ACT clutch. That's the price you pay to play.....

Mine also becomes noisier with increase trans temp. If I start the car at let it idle till the engine is warm the noise is not there, however if I drive and get the gearbox warm the noise appears. As far as I can tell it does have something to do with the gearbox oil viscosity changing with temperature. Tolerances in the box will also change with temp as well as the gearbox oil acting as a damper more so when cold (thicker) then hot (thinner).

Any sort of change in rotating mass will cause a change in the damping characteristics of the drivetrain. It seems that the lighter flywheel has brought the gearbox noise to an audible frequency that is perceived as extra NVH. The noise I hear (frequency dependent) will most certainly be impacted by temperature, load, speed, and rotating mass (dampening coefficient).

I am just happy that I was finally able to use my $200 vibrations textbook from university for something useful..... to allow me to stop worrying about my trans

-Marc
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Old 03-03-2009, 07:27 PM   #37
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Sorry to bump an old thread...but I SEEM to have a similar problem... I am not sure as i can only hear the exhaust in the video.....

I am running Bully 6 puck clutch w/ ACT Streetlight, and this is the first time I run these high performance clutch and lightweight flywheel...... at the same time, a ppg gearbox, which i also have no experience before... Installed the tranny and the clutch/flywheel @ the same time.

Anyways, I am having a grinding/scraping noise??? (sort of like the gears are rubbing against the tranny case) only when I am in gear and decelerating. The noise will disappear when I put it in neutal/ press the clutch/ accelerate. The noise will also quiet down if I go under 2000 rpm/ accelerate.

Since I put in the tranny and the clutch/ flywheel at the same time, I dont know if its the tranny or the flywheel....
So, is it normal as I have lighweight flywheel? or is it actually something inside the tranny?
I am considering putting a stock flywheel to replace the LF, but want to make sure first...

Here are two videos I came up with:


Sorry for the poor quality, but its the best I can come up with.

Also, the car SHUTTERS if I go under 1500rpm....and shutters when I start from a stop, unless I rev it up to about 2000 rpm. But I guess its the clutch

PLEASE~~~~ LET ME KNOW.....

Last edited by kwan_1104; 03-03-2009 at 11:37 PM.
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Old 03-05-2009, 03:08 PM   #38
Supafast
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yep mine sounds like that. got an exedy stage 1 with a exedy lightened flywheel. Wasn't too noisy at first, but I had that shudder problem that wouldn't go away, so i install a cusco tranny mount, and now it's a lot louder. Even with the tranny mount i still have a bit of a shudder every once in a while.
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Old 03-05-2009, 03:50 PM   #39
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um.... good to know that i m not alone....

Tried the tire pressure fix, did not help a bit.
am going to try to put the stock flywheel back on, will keep you guys updated.

Oh ya... it does get noiser as the trans temp increases.
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Old 03-11-2009, 05:26 PM   #40
kh15
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im getting this noise to with my newly installed stage 1 exedy clutch and oem flywheel.
is that normal for a oem flywheel?
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Old 03-13-2009, 09:28 PM   #41
frederik
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Quote:
Originally Posted by kh15 View Post
im getting this noise to with my newly installed stage 1 exedy clutch and oem flywheel.
is that normal for a oem flywheel?
I also have this kind of noise since today, but I have a stock flywheel on a 2003 WRX. I replaced the worn original clutch with a exedy oem replacement about 2 years ago.

Sounds like something loose inside the tranny when not under power or very slightly compressing. When decelerating in 3rd or 4th to a stop, when going below 2k there is a fairly loud low pitched vibration noise similar to a shot wheel bearing, but only for a few hundred rpm range.

It started after a ride in a dirt road, with a few hard starts in dirt. There may have been some ice spots while I was doing that but not sure, I did it where it appeared to be moslty dirt.

I will search on how to drain tranny fluid and see what I find in there.
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Old 03-21-2009, 12:40 PM   #42
dakotaswirl
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Default Exedy OEM Clutch w/ new flywheel NVH

I just replaced my clutch with an Exedy OEM clutch and a flywheel from AutoZone. Now I'm in the deceleration noise club. Not too loud, but definitely wasn't there before -- joy!
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Old 03-22-2009, 12:29 AM   #43
kh15
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Quote:
Originally Posted by dakotaswirl View Post
I just replaced my clutch with an Exedy OEM clutch and a flywheel from AutoZone. Now I'm in the deceleration noise club. Not too loud, but definitely wasn't there before -- joy!
even with the oem clutch and flywheel!!!!!!!!!!!!!! what is causing this, its driving me nuts!
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Old 03-22-2009, 02:56 AM   #44
jacky599r
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pls see my thread... i have noises both at accel and decel!!!!!!!!!!!!!!!!!!

http://forums.nasioc.com/forums/show....php?t=1722921
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Old 03-22-2009, 10:04 AM   #45
unclemat
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Mine diminished over 1k or so miles. Is still there, very noticeable, but not obnoxious anymore.

I believe it's the gear lash noise that for some reason is not damped by the clutch/flywheel suffciently.
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Old 03-23-2009, 01:27 AM   #46
kh15
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i just dont understand how the oem clutch that comes with the car makes no noise and when you replace it with the EXACT same thing, it makes noise!
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Old 03-23-2009, 01:28 AM   #47
unclemat
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Quote:
Originally Posted by kh15 View Post
i just dont understand how the oem clutch that comes with the car makes no noise and when you replace it with the EXACT same thing, it makes noise!
I'd like to know myself. However I know about one LGT SpecB owner that got the decel noise from the factory.
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Old 03-24-2009, 10:01 PM   #48
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maybe you really can't resurface the stock flywheel and absolutely have to use a new one??? just a guess
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Old 03-24-2009, 10:10 PM   #49
unclemat
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Quote:
Originally Posted by kwan_1104 View Post
maybe you really can't resurface the stock flywheel and absolutely have to use a new one??? just a guess
No. Anyway I used brand new OEM flywheel.
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Old 03-25-2009, 07:37 PM   #50
ragejed
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I have this noise, and I have brand new OEM flywheel with ACT HDSS disc and PP. Maybe the PP is lighter then OEM as well?

Either way, what exactly is making this noise? What can we upgrade to eliminate this noise? (I rather have an excuse to buy new performance parts, not more OEM crap...)
Front LSD maybe?
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