Clutch pedal probably wasn't adjusted properly.

Or you ride it like a grandma.

 

Few people realize or know that Exedy makes its own upgraded performance clutch version with an upgraded stock clutch cover and upgraded disck. Exedy has stages 1 through 4. For a clutch that competes with ACT you really need to compare the Exedy stage 1 and 2 - not the tripple which is a stage 3 or the carbon triple which is a stage 4.

Can you fill us on on what the prices are for the Stage 1 and 2?

 

In an AWD car application the clutch is what is wearing in an ideal situation - taking the load off your gears and driveline.

IF I were to engage in abusive driving at the track I could destroy a ACT or Exedy twin in a few passes down the track in one day.

The bottom line is that you posted whp numbers mean you have a heavily modified vehcile and if you do racing on a street clutch you can expect to have a shorter life span.

IF you didnt do drag launches - then the clutch would have lasted fo 40,000 miles with ease

Drag launches take a lot of life out of the twin units

Thats why they went to the Carbon clutches becuse they do NOT wear hardly at all and you can get a much longer service life while still slipping the clutch out of the line

 

Here is a video of John Shepherd's street class AWD talon that has to conform to street class rules. He runs an ACt single disk street clutch, the same one that "shifts slow".
For those that don't know this car has won more races than any other DSM/Mitsu AWD/Evo, IDRC champion back to back, only AWD mitsu that dares to run NOPI pro street tire against the 6 cyl american tranny onslaught, Only one of 2 8 sec AWD mitsubishis, and only 8 sec mitsubishi AWD to conform to street class rules. One of the very few Mitsu AWD cars that run at the track free of any breakage. The guy is outragous in his performance.
I saw his car run many times this yr it wasn't ever broken down unable to make a pass like some of these other cars used to market ****.


Enjoy

http://www.shepracing.com/videos/871.wmv

Sean

 

so I have the twin and I never tracked the car do you know how long it will last?? Yes I do drive hard on the streets but I dont launch it never did..

 

The clutch was adjusted properly. Normal agressive driving won't hurt that clutch like a few hard launches at the track will. The discs will not take the abuse like others can.

Jun had a similar problem with their flywheels years ago. They were designed for road racing, not a slipping AWD launch. A few trips to the track turned them blue and stress cracked them all over. Every type of clutch and most performance parts hve pros and cons. That's the reality so buy what best suits your needs and budget.

I've yet to find someone who switches clutch companies because the one they had was too good.

-Jeff

 

you're a beast jeff

 

Just because Saad Saad was having issues in his car does not mean it will not work for somebody else. His car makes over 1450whp and is a full weight 3400lb+ supra. You cannot compare that to a evo making 500-600whp. The other 6-speed supra that is the current* fastest full weight is running RPS no problems. 9s all day long. Saad is just pushing the limits of everything.

 

Did this ever get answered?

 

We are running the same pressure plate that everyone gets ... MB7


mark
turbotrix

Joel is not alone with having these problems. Ron with the blue evo.. demolished his exedy twin disk.

 

i personally am stumped of whether to get the act or exedy twin disc

 

What about the new exedy carbon carbon or the Cusco twin?

 

The new Exedy Triple Carbon HP one is suppose to hold together very well. I still see no reason to use it over the RPS though. However Exedy recommends the new Exedy triple carbon for any Evo over 480whp that drag races.

 

I've had nothing but good luck with Exedy clutches. Our twin disc metallic held awesome power, it took the car to low 11's at over 130mph. It never slipped under power but it did on hot drag starts at 550-600whp launches. It is not made to hold that power, and I doubt the standard organic disc ACT will put up with that much also. I then switched to the Exedy Carbon-Carbon unit with the HD pressure plate and It's held up like a dream and it's super easy to drive. I made over 660whp and over 500ft-lbs of torque and never one problem. The advantage of carbon-carbon over organic and metallic materials is that as it heats up the coefficient of friction goes up and grabs better as it gets hot. Conventional materials lose grip as heat goes up. We're moving to the triple carbon as we're adding nitrous and trying to make over 800whpand 650ft-lbs of torque on the new setup. BTW I believe Exedy makes the clutch for Cusco.
One thing I did notice on some of the ACT clutches we installed here is that if you have it in first gear and the clutch all the way in, rev it to 7K and it will start engaging the clutch. Some of the guys are having trouble grinding gears at high RPM shifts because of this. I'm not ragging on ACT but myself and others have seen this happen also. Jeff, do you have any insight on this?

-Martin

 

I never compared the cars, you did. I thought we were talking about evos, you brought up the supra as if to say "if it works in an supra it will work in an evo." It doesn't work in his supra so does that mean it won't work in an evo? No idea, you can't compare the two cars. How about trying it in someones car before you make it out to be the best thing ever invented.

-jeff