Exedy clutch issues-help!
Thread Starter
Melting Slicks
Joined: May 2001
Posts: 2,292
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From: Md
Exedy clutch issues-help!
I have the Exedy single in my Z06. At Etown last saturday, I made four qualifying passes. The third and fourth runs, after I powershifted to third and started accelerating, at 5000rpm the tach stopped climbing very fast and I shifted into fourth. When the tach got to 4500-4700 rpm, the tach did the same thing and it felt like the clutch was spinning because the feeling of acceleration wasn't there. Any opinions?
Also, when I was staging for the eliminations, I lit up the first set of bulbs and let the clutch out a little to light the second set. Well, the clutch had a metallic grinding sound and I could feel it through the clutch pedal. Engagement was definitely on/off at that point. But I drove it three hours home and it feels fine with out any noise. Man...this clutch and the install were too expensive for this kind of crap to be happening! Anybody with an opinion on this issue?
Also, when I was staging for the eliminations, I lit up the first set of bulbs and let the clutch out a little to light the second set. Well, the clutch had a metallic grinding sound and I could feel it through the clutch pedal. Engagement was definitely on/off at that point. But I drove it three hours home and it feels fine with out any noise. Man...this clutch and the install were too expensive for this kind of crap to be happening! Anybody with an opinion on this issue?
Safety Car
Joined: Oct 2001
Posts: 3,504
Likes: 25
From: Insert Wittty Comment here
Re: Exedy clutch issues-help! (Mike Siska)
How many miles do you have on the clutch? Who installed it? Did you follow the 400 mile or so break in procedure?
[Modified by J-Rod, 1:30 PM 7/1/2004]
[Modified by J-Rod, 1:30 PM 7/1/2004]
Team Owner
Joined: Jun 2000
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From: Just trying to make it through each day.
Cruise-In III Veteran
Cruise-In V Veteran
St. Jude Donor '03-'04
Re: Exedy clutch issues-help! (CHRIS NJ C5)
hi Mike, give me a call if I can help in any way.. 
you don't return instant messages 
Thread Starter
Melting Slicks
Joined: May 2001
Posts: 2,292
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From: Md
Re: Exedy clutch issues-help! (J-Rod)
How many miles do you have on the clutch? Who installed it? Did you follow the 400 mile or so break in procedure?
[Modified by J-Rod, 1:30 PM 7/1/2004]
[Modified by J-Rod, 1:30 PM 7/1/2004]
Tony's Corvettes in Gaithersburg, Md. did the install.
I followed the break in to a T.
Thanks Chris!
Burning Brakes
Joined: Mar 2002
Posts: 1,176
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From: highland village texas
Re: Exedy clutch issues-help! (Mike Siska)
going to be interesting to see how the Exedy clutch holds up over time...i fried two Spec 3 in much less time ... went to an adj master and a RAM 910.
Drifting
Joined: May 2003
Posts: 1,715
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From: cAshburn VA
Re: Exedy clutch issues-help! (Mike Siska)
First I've heard of a problem with the Exedy. I am waiting for UPS to drop off my twin now. Let us know how this develops, including all the tech details, like what setup you're running what hydraulics on the clutch, etc.
Tony's has always done good work for me, though its been a while. Don't be afraid to give him a call.
Tony's has always done good work for me, though its been a while. Don't be afraid to give him a call.
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Resident moron
Joined: Jun 2003
Posts: 4,746
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From: Assachusetts
Re: Exedy clutch issues-help! (Mike Siska)
Yeah, it sounds like a problem with the car. Think about it - you're at 5000rpm. If the clutch starts slipping, the revs are gonna fly up and smack the rev limiter (without the normally-associated acceleration). If you're hitting a wall a 5000 you might be getting detonation or something similar.
Dope
Dope
Race Director
Joined: Aug 2000
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From: Central Florida
Re: Exedy clutch issues-help! (duffer)
If the clutch were slipping the the tach would climb much faster than mph. Something else seems wrong.
I agree. Not the clutch.
Assume you hammered the car on the way home and all was fine again. That rules out an air leak around the MAF from a torque induced displacement of a connection.
Were you running a very low fuel load on those passes? AND did you gas up before the drive home?
If yes, your drag strip symptom may have resulted from fuel stavation on the shift. Happened to me last year on two consecutive passes at MIR.
Another possibility is the wiring harness shorting out momentarily on the shift. There is a thread on the other forum about that. I'll see if I can find it and edit in the link.
Give me a call if you want to discuss.
Ranger
Thread Starter
Melting Slicks
Joined: May 2001
Posts: 2,292
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From: Md
Re: Exedy clutch issues-help! (Richy)
How do you explain the subsequent clutch behavior & noises at staging?
I went by Tony's and he tried to call Tom at Carolina clutch, but he was out for the day. Tony said maybe the clutch was clamping down too much at higher rpms. I saw Keith at the dyno and he said it sounded like knock retard.
I had between a 1/4 and 1/2 tank of gas.
