I have been running the Exedy Hyper Compe-R clutch for the last 4 years. Originally I had it imported from Japan, but I believe recently Exedy USA has started stocking it. For those of you not familiar with this clutch - it is a twin disc unit with ultralight unsprung hubs, hub drive, and a lightened chromoly flywheel. It comes in about 7 pounds less than your standard Twin HD or SD. The clamp-load on the cover is 10800N which is quite a bit higher than the SD Twin (9800N) and just a tad bit lower than the HD Twin (around 10900N I believe). It should be good for at least 500# of real-world torque.

http://www.exedy-racing.com/racing/en/pro/compe_r.html

Here is a picture of the design:



Just thought I would share this with those of you who may be looking for something a little lighter than the standard Exedy Twins . . .

EVOlutionary

p.s. I will have a BNIB one up for sale soon, as well as a used HD Twin in the sales section. Have 3, but only need two (one for the car and one for backup). . .

 

Hmmm. . . no one interested in this? What clutch are the road racers out there using? Tilton Carbon? Spec?

 

Some more of my thoughts on this clutch that I wrote up to answer a question a member here asked me. . .

I started running this clutch in 2007 - before Exedy USA even really knew about it. Back then it had to be imported from Japan. Thus, there are not many reviews on it in the US market. The Compe-R is in my "race" car that is now driven maybe a thousand miles a year on the street and the rest track - although we will be driving about 3500 street miles in the race car this year for the One Lap of America race.

As far as clutch engagement goes - it really feels pretty similar to the standard Exedy Twin and HD Twin. My buddy had an HD Twin and he thought mine with the Compe-R was easier to drive and easier to slip. I had another friend with an Exedy Single with the 3 or 4 puck disc and although he daily drove it - it was HORRIBLE as far as lightswitch on/off feeling. It was pretty much impossible to slip at all.

There are three "downsides" with this clutch. First - it is a lot more $$ than the SD Twin or HD twin. The performance advantage to me is NOT worth the $$ on the street, but it IS worth it on the track. Second - it is REALLY noisy. It is much noisier than the normal Twin and sometimes I get embarassed when I am sitting at a red light with the clutch in and everyone's wondering why my car is broken. Third - the unsprung hubs don't absorb back and forth "rattle" or slop in the drivetrain - so that is all transferred to your transmission. This, over time, beats up the bronze alignment gates on the synchro assemblies (not sure of the correct terminology, but Jon @ TRE showed me) and will make it slightly harder to get into gear as they get worn more and more. I get my trans rebuilt every two years with fresh syncros and have not noticed any shifting problem, and I race the car HARD and am NOT good at rev-matching and heel-toe downshifting. After two years you can SEE the wear on the synchros - but I have yet to actually FEEL any real-world side effects of that wear.

 

Thanks for that write-up. It will likely be the next clutch to go in the SM car, but we bought rebuild parts for the current twin HD before we had ever heard of this thing or this would have been bought instead simply for the reduction in weight.

 

Just the thread I need, I'm deciding between a twin compe-r and an exedy triple.
Which one would you recommend for a street / weekend track warrior?
Thanks in advance for the answer, cheers.

 

The Compe-R is going to be a little harder to get started from a stop light as it has less rotating mass. It will also be a bit louder since it uses unsprung hubs (not sure what the triple has). If you are going to drag race it alot or are making over 550 ft# I would probably go with the triple.

I have driven the Compe-R on the streets quite a bit and it's pretty easy to live with, as are all the Exedy twin/triple clutches. It is louder though and more race oriented. If you don't mind a little more drivetrain noize I would probably pick the Compe-R, especially if you want to boost your on-track performance.

If you decide on the compe-r I know someone who has an extra one for sale

 

Thanks for the info mate, the car is still my dd but do a little of drag and track on weekends. I have both clutches right now, so Ive just to get decided

 

Carbonetic Twin here. I can say nothing bad about this clutch except it is noisy with the pedal depressed and decell noise is more than the singles I ran.

I was blown away by how easy it is to drive, almost OEM easy.

 

+1 Carbonetic twin, and there is nothing better for dd and track use< exept Carbonetic tripple ))))