Let's talk flywheel chatter.

[Davdraco1]

As the title states, what the hell is it. What about a LWFW causes it. What rpms is it most prevalent in. Is there a fix? The main reason for this thread is a ran an RS4 clutch kit on the ECS RA4 LWFW with no noises and no issues besides when the PP separated and some of you may know what else happened. When I rebuilt my car, I just went with the S4 clutch kit and kept the RA4 flywheel and I'm having some weird noises anywhere from 2000 rpm thru 3500. It usually happens at light to medium throttle. I'm wondering if it's flywheel chatter or something is loose???

[Nollywood]

It's actually noise from within the transmission. The weight of the flywheel, and crankshaft pulley damp / absorb the noise.

[GrapeBandit]

my 2¢ before you hear "any lwfw will chatter". i have been using a 9lb flywheel for the past 10yrs and have zero chatter. spec/fidanza lwfw, and aasco lwfw.

[rodgertherabit]

Mines not light weiight but is aftermarket and single mass, it chatters a little when the ac is on.

I had a 9lb Billet FW in my 6sp gti, chattered like a mofo...

[Davdraco1]

What rpm do they normal make noise at?

[Dan[FN]6262]

quattro trans with lwfw will chatter.

to get it to go away you need to install a product like a fluidampr, but I don't know if anyone makes anything like that for the 058. I should google it.

I had a fluidampr on the B6 with a FX850SS and it eliminated the rattle.

[Davdraco1]

I'm 06A.

[Dan[FN]6262]

well fuck, then get a Fluidampr and stop complaining lol.

[Wrath And Tears]

There's a company out there that modifies the Fluiddampr to work on the 058. Forget their name, and its even more expensive due to adding the v-belt pulleys. Just in case any 058 guys were wondering.

[ray4624]

Ina engineering or whatever


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[pbcrazy]

FWIW I have been running the same kit for 2.5 years and I get the same thing, I called ECS and it's normal. For me it's 2-3000 rpm or at idle with the a/c on, no big deal at all and definitely not worth the effort of adding a fluiddampr

[Wizard-of-OD]

OP,
You can contact Apikol. They have the AEB Fluidampr's listed on the website
http://www.apikol.com/index.php/prod...fluidampr.html

[Davdraco1]

OP,
You can contact Apikol. They have the AEB Fluidampr's listed on the website
http://www.apikol.com/index.php/prod...fluidampr.html

Again, I'm 06a. But thanks for the link.

[Wizard-of-OD]

Again, I'm 06a. But thanks for the link.

If your A/C compressor is under your exhaust manifold then use the above and inform Apikol to not include the spacer since you won't need it.
If your A/C compressor is under the intake manifold and is in the same plane as the rest of the accessories (power steering and alternator) then use the normal Fluidampr 551201 Part #.

A Fluidampr will drastically reduce Flywheel clatter but it will not eliminate it fully. You will need to either go back to a Dual Mass flywheel in order to completely eliminate it. The ECS RA4 is a Steel single mass flywheel which is much quieter than the Aluminum units.
HTH.

[Davdraco1]

When I had the RS4 clutch on it it never made any noise. And I'm not convinced that the noise if flywheel chatter. I'm started this thread to try and find out what might cause it and what it actually sounds like. Would a loose bolts in the FW or PP cause noises? Idk if I have one but I'm just trying to think of everything it could possibly be.

[MrSnickelsnizer]

Ac rattles for me at idle or below 1,000rpm. No rattle at speed. No rattles with ac off. ECS Tuning RA4 kit with s4 clutch. Not a big fan of the kit mind you. What was the spec brand one that drove like stock... stage 3??

[Davdraco1]

It's was the stage 2 kit ECS offers. It's just their LWFW with an oem rs4 clutch kit.

[M-Hood]

As the title states, what the hell is it. What about a LWFW causes it. What rpms is it most prevalent in. Is there a fix? The main reason for this thread is a ran an RS4 clutch kit on the ECS RA4 LWFW with no noises and no issues besides when the PP separated and some of you may know what else happened. When I rebuilt my car, I just went with the S4 clutch kit and kept the RA4 flywheel and I'm having some weird noises anywhere from 2000 rpm thru 3500. It usually happens at light to medium throttle. I'm wondering if it's flywheel chatter or something is loose???

You asking about Chatter or gear rattle because they are 2 completely different things.

Chatter is when the disk does not get full contact with the flywheel/PP surface and skips or basically jumps on/off.

Gear rattle is the noise you hear from the gears spinning in the transmission, it is always there but the dual mass flywheels and heavier steel flywheels tend to soak it up. The lighter the flywheel you go past 17 lbs the more you hear that rattle.



BTW it sounds like you have a vibration issue.

[Davdraco1]

I always thought I was a vibration issue. I double checked all the mounting bolts and brackets...etc. I may just have to get underneath there again and see what it is. The noise didn't start until about a month after I put the new motor and trans in. Maybe something loosened up on me.

[GrapeBandit]

The lighter the flywheel you go past 17 lbs the more you hear that rattle.

how come my 9lb aluminum flywheels ive been using for the past 10yrs dont make my any noise? would a balanced engine combat the flywheel chatters?

[M-Hood]

how come my 9lb aluminum flywheels ive been using for the past 10yrs dont make my any noise? would a balanced engine combat the flywheel chatters?

Chatter or gear rattle? I even heard plenty of gear rattle while sitting next to wall or curb at idle back when I ran a Spec 14 lbs 228mm flywheel. I have had some people say they hear gear rattle with the CM 15 lbs steel 228mm flywheel while some others did not hear any. So each car can be different.


Funny thing is that on the transverse cars the 5 speeds have no gear rattle issue so they can run really light weight flywheels, while the 6 speeds have plenty of gear rattle which is why the tend to run much heavier flywheels.

[M-Hood]

I always thought I was a vibration issue. I double checked all the mounting bolts and brackets...etc. I may just have to get underneath there again and see what it is. The noise didn't start until about a month after I put the new motor and trans in. Maybe something loosened up on me.

Could be that the clutch/flywheel combination is not center balanced and is causing the vibration while your in that RPM range. The Fluidampr might help with that issue.

[Davdraco1]

Could be that the clutch/flywheel combination is not center balanced and is causing the vibration while your in that RPM range. The Fluidampr might help with that issue.

Why only in that rpm range though. If it's not centered wouldn't it do it all the time?

[Believer]

Why only in that rpm range though. If it's not centered wouldn't it do it all the time?

Something to do with harmonic frequencies and such, I think.

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[Davdraco1]

When I did the poly snub mount when everything else was stock I would get NVH at idle and to about 2k rpm.

[MetalMan]

Did you adjust the cage so that it's not touching the snub while at idle?

[M-Hood]

Why only in that rpm range though. If it's not centered wouldn't it do it all the time?

Just like Believer said, it is a harmonic vibration that he is getting, same thing some people got on the older CM 240mm steel flywheel when driving right around 1700 rpm.

[Davdraco1]

I didn't have this issue when I had the rs4 clutch kit on this flywheel. When that kit came apart it did chip the flywheel in a couple spots, maybe it's unbalanced now????

[Believer]

I didn't have this issue when I had the rs4 clutch kit on this flywheel. When that kit came apart it did chip the flywheel in a couple spots, maybe it's unbalanced now????

Since it was presumably balanced for a given mass and now that mass has been changed it stands to reason that the balance would now be effected by that. If that would be enough to yield something noticeable I'm not really sure of.

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[Davdraco1]

The amounts that chipped out would probably only total about a penny

[Dan[FN]6262]

A penny is 2.5 grams. That is a significant difference. Especially if it is out near the starter gear ring, it'll be exponentially worse.

usually when something is being balanced you do not want difference greater than 1 gram, 1.5g is the max according to Carrillo IIRC

[Davdraco1]

It's all by the gear ring

[M-Hood]

It's all by the gear ring

Any missing material is going to throw off the balance of the flywheel, further out from center it is the worse it is going to be. This is why flywheel companies center balance their flywheel, they even center balance their pressure plates seeing those 2 are a complete rotating set and the last thing you want to do is throw off the center balance of something that is so heavy.

[Davdraco1]

I'll check all the mounting bolts and brackets and it sounds like I'll have to invest in a fluid dampener