Im tossed between just going for a single disk like the UR ceramic, or Exedy twin plate...then I see the cusco carbon unit. Overall, that seems the best overall unit...but 1600 bucks...damn. Any suggestions? I've heard negative things about the twin plate Exedy...but not many. Anyone ?

 

ATS...2k but worth it.....only clutch you'll ever need!
http://www.boost-solutions.com/evoclutch.htm
Single Carbon=500whp :: Double Carbon=800whp :: Triple Carbon=1200whp

 

but it grabs so well, its not the only transmission you'll ever need. The clutch may not break, but that tranny will have to be replaced frequently

 

why would you say that? It's actually much easier on the tranny than a single disk counterpart would be.

WWe ahve the ATS's on our site now and available for sale (takes 7-10 days to arrive from Japan).

Also have 1 Cusco carbon twin left as well!

 

well, i can understand that you have an incentive to say what your saying, and i respect that despite the fact that i don't believe its true.

But it seems to me that the strain put on the drivetrain, and the shock caused by a sudden clutch drop would have to be absorbed somewhere, and if the clutch doesn't absorb it, the transmission will

 

who says the clutch would not absord it? The whole point to multiplate clutches is that the clutch can utilize a pressure plate with a lighter clamp load since it has much more friction material than a conventional single disk clutch. The proof is the mere fact that despite being able to hold gobs of power, you can still slip the Cusco, Exedy, PE, HKS and ATS cluches if need be. Many of these units have clamp loads the same as or lighter than stock - that clamp load (coupled with the driver skill), tends to be the tranny buster factor

Dropping the clutch on an Evo equipped with a stock clutch can wreak total havoc as well remember!

 

so which one of the above would you recommend? Ive heard of several Exedy twin discs breaking trannies already. Even if it were b/c of driving abuse...you make it seem as though you can beat on it, slip it, and have it still be in tact.

BTW. i haven't heard of anyone breaking the tranny on a stock clutch. I only see burnt clutches

Also, do you have any experience with the Clutchmasters clutches?

Lastly, do you guys actually have an evo that you race and test your products on?

thanks...

 

We stopped selling clutchmasters along time ago due to a string of failures...they jsut never worked out for us.

I know several custoemrs loally that blew trannies on stock clutchs - all were street racing guys, so that type of thing is bound to happen.

OUt of the current crop, my favorite from a dollar/value performance used to be HKS twin..it was slightly more money than the Exedy/Cusco single disk. After January 1 though, HKS raised MRP by $500.00 and slashed dealer discounts an average of 10% - now its just overpriced IMHO (list went from $1495 to $1950 IIRC). Exedy is a great unit, and we have had no reported failures for any that I am aware of. Driver input and proper installation has everything to do with how long it lasts. I can real you off name after name of customer and tuner who is pushing their Evo with Exedy/Cusco clutches to the limit and so far, so good. How long will they last overall? Noone can answer that, especially since we can't drive the cars for you y the same token, there are plenty of people making good power numbers on stock clutches after nearly 20k miles...others barely got 2k miles out of the OEM clutch on a stock car. So, luck, driver skill, driving conditions, and the direction of the wind all have something to do with it I think!

As for an Evo, no we do not own one at this time - we have come close a few times (first nearly buying a Evo 6.5 TM back in 2001 when I sold my Subaru, then changing our minds about the white Evo VIII last spring when we decided we wanted to get back into the 6 cylinder world, after years of 4 cylinder turbos work/tuning).

We've got loads of experience with Evo's however, going back may years before the evo was ever "officially" sold here. We're alos not into the hardocre tuning aspects of these cars as we once were, mainly due to our hectic race schedule for the 2 BMW's we campaign (I am not even a BMW fan, it just happens to be what we race). Instead over the last 5 years or so, we have been much more involved in the part side of things, and learning from our Japanese friends (several of which race and rally Evo's of various years in the Asia Pacific series,and several others).

We leave the true pushing of the Evo envelope to the customers, and to guys like Buschur, who can devote full time and resources tpwarrds basically one drivetrain, and make the most out of it!

 

Nice write up Z1. I'm at 10K with OEM clutch and no problem. The last 4 times that i launched the car, I didnt smell the clutch. It takes some practice to get there. I try not to launch it when it is too dry outside. I love to launch it in the rain or when it is wet out.

 

Well, Im having the tranny yanked in a week or so to replace the 5th gear syncros. Overall, I dont think the opportunity will grant itself again anytime soon to have an almost free labor job to put the clutch in. Im going to buy the Cusco unit, I feel.

 

here is an exedy twin disc I modified

 

.

 

Dam that thing has gotta be light!!!!! Nice work darkhorse, you are a superb metal worker

 

Darkhorse, what exactly are the mods you did? I don't know what it looked like before you did them..... I'd guess the first picture shows the slots you've machined? The second picture I have no idea of what you did. What is that part? Also, if you did cut them slots, will that no weaken the plate?

 

the two pics are of the outer and center drive disc of the clutch. The outer disc has the back lightened, and the center has outer areas modified since there is a friction surface on both sides. Here is a picture of the center disc when it started before the mods. That should help