Agreed, the biggest mistake is getting "too much clutch" for your application. Organic can handle up to 400hp and even rallycars use organic. Anything higher stage than organic, you shouldn't even be driving that on the street.





but to clarify what I've been trying to say. see this photo. You see that silver or chrome plate under the hub/springs? and you see the 4 hub mounting rivets? Whell that chrome plate hits the mounting rivets and is what stops the hub from moving any further when the springs are maxed out, the distance from the stopper plate and the mounting rivet is much less on a 6 spring design, and most 6 spring design use single springs instead of double springs, that's why it makes so much noise. A certain disk I saw from exedy didn't even have those mounting rivets so it was made impossible to make noise. They designed the hub to mount around that stopper plate.



Here this might be better and to the point. If you compare distance to stop plate on the 6 spring 6 rivet type to your oem 8 spring 4 rivet silent hub design you'll see what I'm talking about. Basically, I think those 6 spring hubs were meant for 2wd cars, where there is less drivetrain weight, our awd requires more/stronger springs, and more distance to the stopper plate or else the disc will just flop around too much and make noise.

 

the evo mr disc has springs that are 50 % longer than evo 8 disc for even greater movement. then there are dual mass flywheels that have even more movement. fast forward to 2.10

 

yea I'm jealous of the cars that use dual mass flywheel design, another great thing about it is that the disc is unsprung, which reduces mass and moment of inertia and improves synchronization, which makes for better, smoother, faster shifting.


I didn't know the mr disc had a different design though good info I'll check it out.

 

+1 it's just the "nature" of the beast.. made the noise on my stock clutch... got my tranny rebuilt, fly wheel resurfaced thennn I put in a stage 4 comp clutch the noise was still there. Oh and it happens In every gear.. and everythings solid on my car

 

thats awesome...now why is my unsprung QM doing the same sound?

 

I disagree with the too much clutch for your build thing, a little.

I've seen plenty of people get exedy twins. They work fine for street driving, and hold the power. But as soon as they go to the track (later down the road) it can't hold. The exedy triple not only takes the track abuse better, but is ALSO drives better on the street

I assume they fixed their bad redesign on the splines, because people aren't complaining anymore. seems like a pretty short run of that inferior design. Unless I develop issues with my triple, I won't be changing to any other clutch than a Tilton. The exedy triple has been good to me through 2 rebuilds, and holds more torque than the transmission can handle.

 

true its smoother than the twin. but TEN times noisier. horrid noisy just turning engine over to start it. I think that clutch is perfect example of turning a nice car into a piece of crap to drive for a daily. but to each his own.

 

yea the triple looks like it has no springs at all.


the double has 6 spring design discs, but 3 hub mount rivets, effectively doubling the springs per rivet and maybe allowing more distance but I can't see.




hey check this out, dunno if you've seen the hybrid type clutches.


http://www.nengun.com/exedy/hyper-single-vf-clutch
http://www.exedy-racing.com/racing/e...single_vf.html


pretty expensive for what it is though, but it's what I had in mind, smooth and quiet, but also grabby and heat resistant.

 

I havn't tried one but from what I understand unsprung discs are the worst in noise.


It's actual gearbox rattle in that case I think. I hear it can cause things go out of tolerance faster in the transmission due to the increased stress without springs to dampen drivetrain shock.


(The reason I praised unsprung for dual mass design is because dual mass is originally designed that way, the flywheel has a giant spring inside it in that design so the disc does not need springs, our cars however do not have a giant spring in the flywheel, so to use a solid disc is quite risky in my opinion)

 

I'd say for your application you are where you are supposed to be, you got a monster motor I bet with that 2.4 and 9.9 1/4 mile time. Solid disc type clutches are best for drag racing where you want to squeeze every last ounce of torque out of the engine and put it to the ground. The springs would absorb some energy to smooth out engagement. But you gotta realize this thread is about daily drivers who put noisey clutches on and don't have a clue why, they don't want what you want, I assume you knew what you were getting yourself into but they sure didn't.

 

I've had this issue since I bought my '04 Evo last summer. Basically, when I let of the gas at 65 mph in 4th or 5th gear, I hear a lot of chatter underneath the car. If I apply the throttle, it stops. For several months, the noise went away. Now it's back accompanied by a low humming. 90k miles. Stock with a stage 2 clutch.

The most similar description I've seen is this:

From reading this entire thread, the consensus seems to be that it is the transfer case OR input shaft bearing.

Can anyone confirm?