Hi all,

Wanted to ask if anyone is running an Exedy Carbon twin plate at all? Or even a carbon clutch. I installed one on my FD recently and am really struggling to get the clutch to hold the power/torque. I heard great reviews for the clutch before purchasing minus of course the fact that carbon has to be warmed up. I went on quite the spirited drive tonight trying to warm the clutch up (exedy recommend 4-5 slips within 30 seconds). I was slipping the clutch, constantly dumping it etc all within a small time frame. It still slips from 3rd onwards and sometimes in 2nd as soon as I hit full boost. I have 550nm of torque (500rwhp) and this clutch is rated at 470ft pound of torque.

Was hoping to hear from anyone running a similar clutch. Perhaps advice on how to warm it up properly. I contacted Exedy directly but unfortunately they were not much help... go figure.

Thanks

 

This is what i ran on my STI for a little over 6 months, I experienced this twice during the 6 months. If I drove around the city for a few minutes, stop and go traffic, the clutch would not slip at peak boost. Also the 2 times it slipped was when I first installed the clutch, after 300ish miles I never experienced that again.

 

Exedy distributor here hasn't sold the carbon clutches. About the only thing they have locally is the intermediate plate.

I'd be surprised the twin would hold your power - slipped at less here on a dyno dynamics in push to pass mode. If it's an R rather than a D, you can covert to triple for about a grand too. The 470 an engine figure from Exedy or one of the distributor guesstimates at the wheels? You'll notice differences between UK and US sites!

One of the guys from Nth Qld on the other forum had his sprung centre carbon clutch reworked by Jim Berry (I think?), replaced with cerametallic puck type to hold his power. I guess you could try grinding the posts to increase clamp load, if it's just on the edge. It's worth mentioning, all metal parts degreased before installation? With the slipping, easy to burn the flywheel, intermediate and pressure plate by overdoing it....long way from a carbon/carbon clutch unfortunately.

 

Thanks for posting. I was concerned that the clutch perhaps was not rated at my power/torque levels but even on the dyno, it managed to hold the power but it was inconsistent which made me think maybe it was a heating issue. I might have to send it off.

 

That was me; Dennis long time no speak, call drew from direct clutch and get him to sort yours out like he did to mine and Nat's. have a look in my fdrx7.com thread its got pictures of how bad mine was. Direct replaced the plates with their own and resurfaced everything for me and now it seems good to drive but due to my lack of finances and more so time management i haven't driven the car much since then. Also need to make sure your hydraulic system is working well as i think mine was the start of my issues with the clutch.

Also note mine was the dampened core version and if you have the regular un-sprung version its (as stated earlier) easy to upgrade to a triple plate.

Brad.

 

I've run them on plenty of cars over 500 whp and never had an issue once the clutch is warmed up. Because of this however, I strongly advise against them for anything but a road race car. They are super expensive to rebuild as well. The standard Exedy twin is preferable in a car that sees the street in my opinion.

 

Thank you for your response. Do you recommend a particular way to properly warm this type of clutch up on the street?

Thanks,

 

What brand of dyno delivered the "500 hp" in both cases? Can end up with the usual, clydesdale v shetland ponies comparing across brands in chassis dynos, 15~20% variation isn't unheard of in my experience.

 

---> https://www.rx7club.com/3rd-gen-gene...review-823401/

 

I have a Mustang awd dyno, which tends to read about 12% lower than a Dynojet. These clutches need to be moderately slipped when cold to get them to operating temperature so they grab. Some of my customers set the ebrake, rev the car slightly, and slip the clutch while in gear a couple times before they start driving.