Sprung Clutch disk VS unsprung disk noise

[V8<turbo4]

Hello

I have a single mass flywheel in my car with an unsprung clutch disk. the gear rattle sitting at idle in neutral is horrible!

Now I'm going to be getting back under the car and changing it out again.

does anyone have experience with gear rattle noise between sprung and unsprung

Im thinking of going with a sprung disk and keeping the single mass flywheel. (some shops say it will help a lot with noise some say it won't help at all)

I really need some opinions on this otherwise I'm gona buy a new DMFW

Im not going to change the fluid and not looking to raise idle... Im ok with some light noise but not crazy amounts like I'm hearing.

[chadillac2000]

Judging off how many threads you've made regarding this noise, I'd suggest going back to a DMFW if you aren't willing to raise the idle. Why wouldn't you be looking to do that? That's the easiest, cheapest way to remedy this with zero labor involved. I find my car actually idles more smoothly when I bring it above the stock 650 idle. Most people say an idle of around 800-900 eliminates the majority of the rattle you're complaining about.

[V8<turbo4]

Thank you for your response.

I have started a few threads and I'm still not getting direct answers I wish I could speak with someone who has a single mass light flywheel with a sprung disk and let me know how the rattle is.

I know what it sounds like with an unsprung disk and it's damn loud.

[V8<turbo4]

I ordered the sprung disk... anyone else have experience with this? Im hoping it helps

[rominun]

I just put my Mfactory SMFW and 335is clutch and the rattle is horrible, but oh well. Its a racecar now.

[V8<turbo4]

Originally Posted by rominun

I just put my Mfactory SMFW and 335is clutch and the rattle is horrible, but oh well. Its a racecar now.

Sprung disk or solid?

[MFactory]

Sprung/Non-Sprung disc makes zero difference to the rattle.

The rattle you are hearing is the noise of your transmission that has always been there; just that the noise was dampened by the DMFW.

[V8<turbo4]

Originally Posted by MFactory

Sprung/Non-Sprung disc makes zero difference to the rattle.

The rattle you are hearing is the noise of your transmission that has always been there; just that the noise was dampened by the DMFW.

That's not what I've been told by ACT and other shops.

The sprung disk should make a significant difference.

I guess I will know soon enough I will have the sprung disk installed Friday

[Dmak]

Let us know once you changed the disc. I read that some ppl say sprung hub help, some say it makes no different. Also really interested in how's the engagement feel between the sprung/unsprung hub.
Fyi. Even with stock dmfw/clutch combo, on a hot day with a/c on, I still notice the transmission rattle from outside the car.

[Jeff@TopGearSolutions]

Originally Posted by V8<turbo4

Thank you for your response.

I have started a few threads and I'm still not getting direct answers I wish I could speak with someone who has a single mass light flywheel with a sprung disk and let me know how the rattle is.

I know what it sounds like with an unsprung disk and it's damn loud.

There is rattle with sprung and unsprung, only way to reduce it is to raise the idle or stay with DMFW.

Some other people have played with different types of transmission fluids but it seems to be hit or miss.

If you are not exceeding over 500HP you can stay with a new DMFW.

Also on a fresh install the rattle will be at it's worse. After about 500 miles it settle a little bit but still audible if you dont raise idle.

[vinylengraver]

For what it's worth my car is a 2012 MY, all stock with 18,000 miles and the rattle in neutral with the clutch out is always there once the idle settles down to normal, which in my case hovers around 670 RPM.
It's rhythmic and regular, quite noticeable when the car is in the garage but as long as the frequency and volume remain the same I assume it to be normal due to the floating nature of the setup.
Reminds me of the unique racket my Ducati makes when at the standstill. Like this one here:

So not a bad thing, just adds to the character, lol.

[Neiman Levenson]

I have done just about all the research possible on flywheels / clutches for our cars. So far, Every individual has said that Sprung vs unsprung makes no difference on chatter from what I've seen. I've also seen that only ones saying the sprung clutch makes a difference on rattle is the ones who sell sprung clutches.

If you don't like the rattle there is really only 3 possible options.

1) - use a DMFW only possible if your 500hp or less
2) - raise the idle (best solution, easiest, cheapest, and 9/10 times its the most effective solution possible. Choosing between sprung vs unsprung is really not an effective way of eliminating chatter because as said earlier it is coming from the transmission, and its the SMFW that is exposing the chatter. Chatter is always there, its just the DMFW that dampens it.
3) - Live with the chatter. The chatter is a very small price to pay for having more holding power, benefits of a SMFW, and getting to enjoy all that wonderful HP our cars make. Like mentioned above, the chatter kinda has character and anyone who knows anything about high HP manual cars, will notice the chatter and understand whats up / appreciate it.

[V8<turbo4]

Update!!

So yesterday I installed the sprung disk and I must say it was a huge improvement!

It didn't solve the gear rattle but it did make a big difference. I took videos so you could compare.

The clutch has only been in for 30 miles and excited to hear what it sounds like after he break in period

[Dmak]

Originally Posted by V8<turbo4

Update!!

So yesterday I installed the sprung disk and I must say it was a huge improvement!

It didn't solve the gear rattle but it did make a big difference. I took videos so you could compare.

The clutch has only been in for 30 miles and excited to hear what it sounds like after he break in period

Did the clutch engagement point/feel change much?
Where did u get the sprung disc only?

[V8<turbo4]

Yea the engagement isn't nearly as aggressive the point of engagement seems to be the same however.

I got the sprung disk directly from ACT

[Jeff@TopGearSolutions]

Yea the sprung will give at engagement, that's the biggest benefit of it.