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Old 10-04-2009, 03:48 PM   #101
fast_lanz
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Mine sounded very similar to that video. I would say it's the clutch as it did it with the stock flywheel however not sure if "other sounds" would appear with a lightened flywheel and stock clutch. Someone surely knows....
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Old 12-02-2009, 12:49 AM   #102
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Quote:
Originally Posted by Supafast View Post
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.
well yeah the cusco tranny mount is only going to increas your NHV and make it more noticeable.
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Old 12-02-2009, 12:57 AM   #103
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Sounds like clutch chatter. It's normal for exedy clutched. It's just the disk bouncing around. Doesn't happen in nuetral and only happens when you decelerate in gear. It should be ok. If your worried recheck your work or take it to a performance shop.
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Old 12-18-2009, 04:36 PM   #104
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this week i changed my toyo R1R tyres for the winter tyres (dunlop wintersport M3) .....the noise has disappeared .... put back the toyo, the noise is back....i'm going to buy a STI clutch & flywheel, this noise is too boring for me
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Old 02-03-2010, 12:27 AM   #105
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Glad I found this thread as I was about to go crazy...

Installed Exedy OEM replacement clutch and resurfaced stock OEM flywheel. Getting scraping/grinding noise like many of you do.

Is there any fix for this problem?
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Old 02-03-2010, 12:18 PM   #106
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Quote:
Originally Posted by txl146 View Post
Is there any fix for this problem?
Put the OEM Subaru Clutch/Pressure Plate back in.
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Old 02-03-2010, 03:07 PM   #107
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anyone knows approximately what % of people are having this issue with aftermarket clutch/flywheel?

My car sounds like transmission is falling apart.
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Old 02-03-2010, 03:19 PM   #108
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If your car is having the problem, please post your set up here:

02 WRX
Stock 5 speed
Clutch type: Exedy OEM replacement clutch kit
Flywheel: resurfaced flyweel
Purchased from: Amazon.com
Price: $180
Description: makes loud grinding / scraping sound only when foot is off gas pedal similar to video posted in this thread. Noise goes away when clutch pedal is depressed.
If fixed, how?
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Old 02-03-2010, 05:20 PM   #109
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If you had read all the previous posts then you'd see that what I told you is true. The only thing that is going to work vvvv

PUT THE OEM SUBARU CLUTCH BACK IN

Sorry, but that's all that is going to work. I know 6 people with aftermarket clutches, all 6 have the same exact problem as everyone in this thread, including myself. All have one thing in common, AFTERMARKET clutch. Those that have went back to the OEM Subaru Clutch are once again happy, no crazy chattering/grinding/vibrating to speak of.

Of course there are exceptions to the rule. There MAY be a few people out there with aftermarket clutches that are NOT experiencing any of these symptoms, but I will bet they are far and few.

Good Luck.
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Old 02-03-2010, 05:32 PM   #110
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^ Not always true.

Some people have this issue with OEM SUBARU CLUTCH/FLY in their 07-09 Legacys, both 5MT and 6MT (same clutch/fly as 06+ WRX in case of LGT 5MT).

Btw, I have HDSS ACT clutch (6MT) and noise is there, but it got much quieter over the course of 3k miles. It's not an issue really. I would never go to the crappy stinky weak stock clutch.
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Old 02-03-2010, 07:52 PM   #111
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Of course there are always exceptions to the rule. Didn't I state that?

The best chance of getting rid of all that racket is by putting in the OEM Clutch and hope for the best. Your chances are far greater that you will have quiet(er) operation that way.

I just deal with mine (Exedy Stage 1 w/HD Pressure Plate). I like the pedal feel and I don't launch or bang gears so I'm not too worry about any extra load on the tranny. It's nice to know I have the clamping force when I eventually bump up the ponies.
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Old 02-03-2010, 10:38 PM   #112
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Another potential solution is to adjust tire pressure front to rear. 4-6 psi (if I remember correctly).

Yes I hade/have this problem. Exedy OEM replacement with lightweight flywheel.

Pressure correction did the trick when I was running re070. Not so much with khumo mx on 16s but still better than even pressure.
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Old 02-04-2010, 09:48 AM   #113
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Quote:
Originally Posted by REVNU View Post
The only thing that is going to work vvvv

PUT THE OEM SUBARU CLUTCH BACK IN

Sorry, but that's all that is going to work. .
The Exedy stock OE kit is the original clutch, no? As in, they supply the parts to Subaru, they are the same as this kit? Has anyone compared the stock clutch plate compared to the Exedy OE plate?
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Old 02-04-2010, 09:53 AM   #114
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So it's the clutch making the chatter, not the light weight flywheel?
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Old 02-04-2010, 10:02 AM   #115
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So it's the clutch making the chatter, not the light weight flywheel?
It's a combination. From the threads I've read it can be from one or the other or both.
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Old 02-04-2010, 11:01 AM   #116
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Crap... well I've got both (Exedy Stg 1 clutch, 14 lb flywheel) so I'd have to change out both to OEM
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Old 02-04-2010, 12:46 PM   #117
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Quote:
Originally Posted by Snowphun View Post
The Exedy stock OE kit is the original clutch, no? As in, they supply the parts to Subaru, they are the same as this kit? Has anyone compared the stock clutch plate compared to the Exedy OE plate?
Exedy IS the OE supplier, it doesn't mean it's the same exact clutch assembly. I've never compared the two, but if they are anything like the Honda clutches there are slight differences between the two (OE vs Exedy OE).
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Old 02-04-2010, 12:52 PM   #118
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Here is response from ACT:

"The deceleration noise described has nothing to do with the surface or resurface since the clutch is fully engaged at the time. Chatter is a totally different subject, having to do with harsh engagement or shuddering only during engagement. The two subjects are often confused in discussions like this on the message boards.

First let's talk about chatter. This is something felt, and not so much heard. Clutch chatter is usually from the interaction of the friction surfaces (as long as everything else is ok). For instance the replacement discs from Exedy which are made in their Thailand friction material plant seem to engage more harshly than the OE friction materials (assumed made in Japan).

Deceleration noise (or other gear noises) occurs because of engine pulses being transmitted to the transmission gears. Of course the engine pulses (torsional vibrations) are influenced by a number of things such as compression, boost, timing, cams, etc. What normally helps to dampen these torsional vibrations out are the springs in the clutch disc and the heavy weight of the flywheel. In the case of the 06 thread you reference, keep in mind that the Exedy aftermarket replacement clutch is different from the stock clutch. The stock Subie (Exedy manfactured) clutch conforms to stricter standards and specifications. The OE clutch has a "wide angle damper" design which may or may not be the case with the replacement part. I don't know the exact details in this case without looking at the parts, but we have seen this all the time. Just because it says Exedy doesn't mean it is the same as OE. In some cases the automaker prevents the clutch manufacturer from offering the same part on the aftermarket, since they have a lot invested in testing, tuning the dampening, etc so they can only offer a similar part. Sometimes the clutch manfacturer changes the design on their aftermarket replacement parts to save costs.

A lightened flywheel can contribute to gear noise (there are several different types besides decel, btw), but you also have to consider what disc is being installed and that goes both ways. Also consider what changes have been made to the engine and tuning."
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Old 02-04-2010, 03:31 PM   #119
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^Good info... I hate my decel noise with a passion.
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Old 02-04-2010, 07:54 PM   #120
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Quote:
Originally Posted by REVNU View Post
Exedy IS the OE supplier, it doesn't mean it's the same exact clutch assembly. I've never compared the two, but if they are anything like the Honda clutches there are slight differences between the two (OE vs Exedy OE).
You haven't compared the two but you're yelling at people that putting the stock Subaru part back in is the only fix? Why would you make such a strong statement? I suspect there may be differences but we can't just declare it to be the problem.
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Old 02-04-2010, 07:59 PM   #121
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I am dropping my car off for inspection with the shop that installed Exedy OEM replacement clutch + resurfaced flywheel (only 3 weeks old). If shop determines noise is caused by Exedy replacement clutch, shop had agreed to install another clutch at a discounted price. I'd rather spend money than to live with such obnoxious sound. Sounds like transmission is about to fall apart.
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Old 02-05-2010, 01:54 AM   #122
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Quote:
Originally Posted by Snowphun View Post
You haven't compared the two but you're yelling at people that putting the stock Subaru part back in is the only fix? Why would you make such a strong statement? I suspect there may be differences but we can't just declare it to be the problem.
I think you misunderstood. I guess I should have clarified. I haven't compared the two, as in a side by side VISUAL assessment of the differences between the two.

It's easy for me to make such a strong statement. I had a stock (OEM) clutch, no noise - put in an Exedy Clutch w/stock (oem) flywheel, chattering and decel noise. I personally know three people who HAD the exact same problem I and many others in this thread have. Guess what made all that nonsense go away? They went back to the stock Subaru OEM clutch and flywheel (only one had an aftermarket flywheel). IIRC (I could be wrong) I read of at least one person in this thread who went back to the OEM clutch and it solved their problem as well.

Gopsu posted a good quote from ACT and I think it's pretty much spot on and what I have come up with using my own research and knowledge from other car manufacturers. I am willing to bet my next paycheck that the Subaru OEM and the EXEDY OEM are different, be it in materials or design or both. Those differences in the EXEDY OEM are what are causing the symptoms that people are experiencing.

There are TWO combos in this thread that I have seen that cause the problem:

1. Aftermarket Clutch and Aftermarket Flywheel
2. Aftermarket Clutch and stock Flywheel

The one common factor is the aftermarket clutch. I'm going to bet that the clutch is the problem. I for one can live with the noise for now, but in 5 pages and searching numerous threads I have yet to see only ONE "fix", and that is to go back to the Subaru OEM clutch. I'm not going to say it will work 100%, as there are no guarantees in life, but it is the only solution I've witnessed myself that has solved the problem... 3 out of 3 times.

When I put the Subaru OEM Clutch back in I will post back here with the results.

In the meantime, good luck!

Last edited by REVNU; 02-05-2010 at 04:03 PM.
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Old 02-05-2010, 01:57 AM   #123
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Quote:
Originally Posted by txl146 View Post
I am dropping my car off for inspection with the shop that installed Exedy OEM replacement clutch + resurfaced flywheel (only 3 weeks old). If shop determines noise is caused by Exedy replacement clutch, shop had agreed to install another clutch at a discounted price. I'd rather spend money than to live with such obnoxious sound. Sounds like transmission is about to fall apart.
I hear ya man. Some days mine is noisier than others. It sounds like a REALLY bad heatshield rattle most of the time and some days it sounds like rocks in the transmission. Good luck, I hope you get it fixed. I plan to do mine here in the very near future. For now I just turn up the radio louder and I don't hear it.
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Old 02-05-2010, 02:59 PM   #124
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Quote:
Originally Posted by REVNU View Post
There is TWO variables in this thread that I have seen that cause the problem:

1. Aftermarket Clutch and Aftermarket Flywheel
2. Aftermarket Clutch and stock Flywheel

The one common factor is the aftermarket clutch.
So what part of the Exedy clutch are we thinking is the problem?The whole kit is suspect or just the clutch plate?
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Old 02-05-2010, 04:01 PM   #125
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So what part of the Exedy clutch are we thinking is the problem?The whole kit is suspect or just the clutch plate?
It's kind of hard for me to say as I haven't done any testing. If I would suspect any one part it would be the clutch housing. I can't say for sure though, as I don't know how different they are, so it's just a wild guess.

The only way to find out is if someone starts swapping out clutch components. I would either stick with the full Subaru OEM or your choice of aftermarket clutch (and deal with the noise). IMO it's really not cost/time effective to start mixing and matching parts.

Like it was stated in ACT's response to this problem. Subaru probably spent thousands of dollars in R&D to get a quiet operating clutch assembly. So I have no doubt there are differences with their clutches compared to the Exedy OEM.
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