i finally got around to testing one of these clutches out and i will say it sure does seem like it will handle the power that it claims. BUT these clutches seem to be hit or miss and really depends on how well they are broken in as to how they react.

the last one i installed was lightly used but had already been broken in so there was little i could do to adjust how the clutch reacts on takeoff. the clutch grabs like a **** and can handle just about any power level you can toss at it with the stock/modified FC/FD transmission until you grenade the tranny.

the downside is that they are notchy as hell once they start getting grabby, it is not a very friendly street clutch in my experience as the car basically wants to lift the front wheels up and rip *** unless you baby the crap out of the pedal until it starts to roll the car, feathering it just results in you looking like an *** in the middle of traffic as your drivetrain cries for mercy... heh.

anyways, that is my experience with the twin disc exedy clutch, it will definitely handle any of your power needs for the application it is designed for but i certainly wouldn't recommend it if you drive in traffic much.

even the many unsprung single disc ACT clutches i have used in the past were much more easy to manage than this clutch is, however the squealing/chirp noises and still harsh engagement still suck for any street driven car but they can generally handle up to about 500WHP which is where the transmissions usually give up anyways.

even for drag purposes this clutch may not be the best idea, you generally want a clutch that you can slip a little when needed on launches and if you think single unsprung clutches are an on/off switch then you have no idea until you try one of these.

my synopsis is this clutch is very good for drag(if you can adjust your hydraulic throw to be less sensitive or if you have excellent foot control within a narrow range) and track driving but a puck clutch is more forgiving for street driving applications where big power is involved. i would almost say that this clutch almost has no real practical use due to the transmission/differential now being the weakpoint in the chain, but if you want overkill within the stock-ish drivetrain then it will certainly fit the bill.

 

oh man.
I though the twin disc clutches were suppose to be smoother then a puck clutch on engagement, I thought wrong lol

How is the pedal effort?

 

Was this the regular twin disc or the carbon?

 

Which Exedy twin disc are you talking about?

I run the ZM022SD with the twin sprung center discs and it is very "streetable". Very nice engagement with rock solid holding power even above 600whp. I find it infinitely better than any of the ACT puck clutches which have terrible chatter/jerking issues when trying to ease the clutch pedal out.

 

My experience is the same as Banzai's. VERY streetable, i absolutely love it on my own personal FD and it's been the same with the four Exedy twins I've installed on customer's cars.

Something else is going on with that setup to cause you those problems.

 

I have yet to run one in an FD... but I had one in a daily driven 11-second Evolution for many miles and it was WONDERFUL on the street. I've also been in countless car with them and they have all been great. That said, the Hyper single, em, maybe not so much.

In the interest of full disclosure, I *did* work for Exedy for a while - but I ran their products before I was with them and continue to long after.

Perhaps there was more then meets the eye with that used one...

 

I have a Exedy Hyper D twin plate carbon in my FD - sprung center is important on the street! It sound's like you have a solid center clutch, they DO have no give, and ARE a pain on the street

With the Hyper D the center is sprung, and if it wasn't for the rattle when the clutch is pressed, you'd never know it was a twin. It grips when you need it to, but taking off on the street is smooth - as carbon allows some slip, and the sprung center absorbs the jolts. I know 4 guys with this clutch, all of them agree.

Having said all this, I have tracked the car with this clutch - handles that great too but I'd go solid center if it was a dedicated track car

 

ive never driven an exedy twin disc, but my experience with couple different other twin setups is that "used" or "unrebuilt" they suck, like a lightswtch.

but rebuilt, its like stock.

 

i didn't even realize that they offered so many various types, anyways it was the carbon version:

ZM023SBMC
http://www.exedyusa.com/race/Clutch_Specifications

not that it matters but it went into an S5 turbo II with an FD transmission with S5 tailshaft for ease of installation. pedal effort is slightly on the stiff side but not too bad, similar to a centerforce pressure plate.

 

ZM023SBMC is listed as a triple plate carbon: http://www.exedyusa.com/race/ZM023SBMC

Are you sure that's the right clutch? It doesn't match what you're saying.

 

oops, wrong one. twin disc carbon:

ZM022SBMC1
http://www.exedyusa.com/race/Clutch_Specifications

 

I had ACT 6 puck then 4puck solid clutches for awhile, and they were a pain though a race car only so not a big deal. Chattered and were grabby.

Have had an Exedy twin with sprung clutches for the past year and it has been a cakewalk in comparison. Very easy to modulate. Probably my only complaint would be that the throw to go from starting to engage to fully engaged seems fairly long.

-Andy M.