So after 3 months I got my car finally back last week I put a new clutch (Sachs Stage 2.5 Kit) and had my transmission rebuilt to fix 2nd gear pop-out replaced all synchronizers while in there and I kept my stock DM flywheel because it had no wear or burn marks. I am hearing a chatter sound (not as loud as Lwfw I have heard) at idle you can't hear it with AC or radio on but you can rev it in neutral and hear it up until 3000 RPM'S at that point my exhaust over takes the sound. It does not make this on cold starts only once fully warmed up can you hear it. I was thinking 1. It's a bad NEW throw out bearing DRY?. 2. My stock dual mass flywheel? 3. Or the clutch disk just needs to be broken in more? I came across a thread on Rennlist and I copied this quote which sounded much what I am describing:

"My experience, based on among other things my time with my 03 Turbo, if the engine/drivetrain was fully up to temperature -- like after a thorough test ride/drive -- and if the car is equipped with a manual transmission the tranny (or clutch or both) can making what could be described as a clapping sound. It is gear (or clutch disc) rattle.

My Turbo makes this when fully up to temperature, sometimes. It has to be warm. The transmission fluid is pretty thick otherwise. I can stop the noise by just normally pressing the clutch pedal then releasing it. I can make the noise reappear by revving the engine a bit."

Can anyone else chime in if their car does the same meaning once your car is warm can you hear any drive-train noise go away as soon as you engage your clutch. It's been 3 months since I have really driven my car and I cant remember if this is normal noise or if I am over analyzing after having all this work done to it

 

Lol 69 views and no feedback come on none of you can tell me if you push your clutch in at fully warm temperature if you have any sort of drive train noise go away when your clutch is fully engaged in neutral?

 

Hey there, well I have the exact same noise you're talking about, except my car is completely stock with original clutch/flywheel components. The only thing that I did to make this start happening was the installation of 75duro tranny mounts as the old ones were worn. Occasionally, well say 75% of the time, at idle something back there rattles and is annoying as heck. but when I press the clutch in, the sound goes away as you were saying. I honestly have no idea what this is either as the car is somewhat new to me still.

 

Thanks for the feedback since my engine and tranny was out I also changed my engine and tranny mounts but went oem for preventive measures. I agree it is annoying sound especially since I just put over $8000 dollars in my car in last 3 months I hate noises I cant identify. How long have you had your car?

 

I've had it for almost a year now, its been great. I performed maintenance when I first got it, and since then I drive it almost everyday and drive it like it's meant to be driven. I've been planning on getting a tune on it, but just been putting it off as I really don't need any more power driving to and from work.

 

You should hear my car but I'm running aftermarket clutch and flywheel. It chatters do to light flywheel. Even at low rpms Its normal for me. I say just drive it. If it gets worse go back and let them know. Who ever did your clutch.

 

Last time I went to a cars and coffee a guy there let me sit in his car to listen to his LWFW at idle and that chatter noise would drive me nuts, one reason why I wanted to keep my stock DM flywheel. I'm going to put 500 miles on new clutch to see if noise goes away my mechanic and transmission builder say to drive bit more as well so we will see. I need to stop listening to 996TT videos on forums like this one http://www.renntech.org/forums/topic...shaft-failure/

 

i have a triple disk carbon fiber clutch and the only chatter i ever hear is when the clutch is pushed in at idle. no other sounds at any time. the only time the clutch is in at idle is at a red light. barely hear it now I'm used to it. ( and any car guy knows what that sound means!)

 

If the chatter is present when the clutch is pushed in this is the clutch friction disc rattling on the input shaft splines, which can also affect the input shaft's rotation and result in more gear set rattle from the transmission.

I would attribute this to the carbon fiber disc's possibly lighter weight, or if it was heavier than the stock disc's weight, to the affect this would have on the natural harmonics of the rotating mass of the disc and input shaft.

There is also just plain old balance, or lack of balance to explain this. IOWs, the carbon fiber disc may not have a good a balance.

 

nothing to worry about this noise at idle and fully hot transmission....change oil to a 75W-140 GL5 Oil maybe it is a little better

 

Yes it only happens when transmission is fully warmed and noise only goes away when you push clutch pedal at least half-way. The average person I have to tell them what to hear for, so it's not like it's super loud just enough to annoy be to thinking it's not normal. My transmission builder recommended using Liqui-Moly 75W-90 synthetic and thats what my mechanic filled it with I never heard of Liqui-Moly I hope it's a good product.

 

I have the same problem. Except it seems to have become more pronounced over time and I'm worrying about damaging other internal parts due to the possible harmonic imbalance, or clutch springs (or whatever the problem is).

Also under heavy acceleration I'm now hearing it even above 2500 rpms.

It has made me not want to drive the car (yes, I'm ashamed to admit it but it's true) What, no heavy acceleration???? PSHAW!

Therefore, I ask you....

Will it damage my new clutch plate or other components?

Will the return to a stock flywheel solve the problem?

Will I ever learn to love driving again?

Why is the world so cruel?

Can anyone please help me with these (and possibly other) questions?!

I can live with the annoying rattle at idle when not in gear (although, apparently, some others can't as I have been asked to shut it off at some drive throughs because they cant hear my order!)

 

The noise that prompted this thread is something that only occurs with the car warmed up and idling with the transmission in neutral and the clutch pedal fully released and with a stock clutch and flywheel. That is these are the circumstances under which the OP reported hearing this noise and also the circumstances under which I heard, and continue to hear, the noise and said so. It was my comments that the OP quoted in his initial post.

And depressing the clutch makes the noise go away and releasing the clutch pedal does not have the noise returning. However, with the clutch pedal released I can rev the engine a bit and often when the revs return to idle the noise is back again.

(As an aside, I know that a LWFW setup or an aftermarket clutch kit can have its own rattle characteristics, but I do not know under what circumstances the rattle nosies can appear.)

To hear some rattle under hard acceleration suggests what you are hearing is not from the same source. The clutch/flywheel, drivetrain, are all under load and there should be no rattle like there can be when these are not under load and the car stopped at a light with the engine idling.

Thus the noise you are hearing is different.

I would have to believe the noise is engine noise, something that sounds like drivetrain rattle perhaps but obviously is not drivetrain rattle.

Well, check that. It might be drivetrain rattle. There have been a few cases of cardan shaft problems that have the car emitting a rattle.

So there is abnormal engine noise, possibly some drivetrain noise but not for the same reasons that prompted this initial discussion. There can also be a more benign explanation, and that is a loose heat shield or some other hardware that is touching something it shouldn't. There can be a loose converter brick or a loose exhaust part, too.

Without an audio clip I can only offer WAGs. And no I am not suggesting you create audio clip for me or anyone else to listen to. In these situations I always advise the owner get the car to a qualified tech.

Any running of the engine, any demo'ing of the noise has to be done in the presence of a quaffed tech that one trusts to ID the source of the noise and properly address the source of the noise.

One shouldn't be over and over again reproducing noises. No noisy car or engine ever got better by more driving or running.

 

As Macster points out I kept my stock dual mass flywheel and my particular noise has not got progressively louder in last 1400 miles since my clutch was replaced. After I started this thread I went to Porsche dealership unfortunately all the tech's were out to lunch, my service adviser came out to take a listen he said he wouldn't even write it up to check it out because it was normal he said after market clutch "packs" & "springs" are different weights causing more noise in the drive-train(have no clue if this is true either way didn't sit well with me) I took it next to the Porsche mechanic who did the install he also said what I was hearing was also normal sound and to only be concerned if it got progressively noisier. Still in back of my mind I wanted another opinion so another mechanic friend that has installed about 15 clutch kits in 996/997 Turbo's & said they have all made the same sound. His explanation was the clutch release bearing, he said something to the effect of the Porsche's have a unique bearing design that disengages and reengages as you press and release the clutch in are cars and at idle the input shaft is riding on the bearing causing the noise I hear. (Again I am not a mechanic still not sure if this is 100% true) My friend actually laughed because he thought he was going to hear something in the effect of having a LWFW because in my particular noise you can only hear it at idle with AC off and radio off to hear it. For example if you were in a car next to me no way you would hear it.

IMO if your car is getting louder I would take it back where you had the work done see if they can diagnose your issue.

How many miles have you put on since the clutch install? Does it make different noises verses if it's Hot or Cold?

 

yes, i would take it back. they fuc*ed you on price ( this i know from your build thread..sorry ) and there's no real reason not to believe they *may*? have done inferior work. there should be NO NOISE chatter or otherwise from a new 2.5 kit as long as the parts were new and it is a dmfw.

i have a brand new oem sachs with a brand new gt2 disc w dmfw and there is NO NOISE or issue whether engaged or not. no slippage no chatter no weird engagement NOTHING. sorry to hear of your issues, but guys get talked into "over parting" their cars because sales guys make MORE MONEY on higher priced parts duh. you shoulds stayed with oem and maybe a gt2 disc. they're good FULLY up to 550/600 if you treat em right. e.g. just "clutch in clutch out" lol

take that sh*t back pronto!