Clutch problems
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Instructor
Joined: Nov 2005
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From: Oceanside CA
Clutch problems
My 2006 C6 has had a clutch chatter from the beginning. Yesterday, during a "brisk" start from a standstill, the clutch slipped like hell and only came (the pedal) out about half-way.
Is it time to go to the dealer (I've mentioned the chatter before), and demand some action. Also to mention the recalls I've heard about?
This car has 4.000 miles on it and has not been thrashed!
Is it time to go to the dealer (I've mentioned the chatter before), and demand some action. Also to mention the recalls I've heard about?
This car has 4.000 miles on it and has not been thrashed!
Race Director
Joined: Aug 2000
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From: Central Florida
Originally Posted by tlacroix
My 2006 C6 has had a clutch chatter from the beginning. Yesterday, during a "brisk" start from a standstill, the clutch slipped like hell and only came (the pedal) out about half-way....
The LS2/LS7 clutch does not respond well to slip.
So it puts a premium on getting the clutch out fast on the launch.
Ranger
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From: Oceanside CA
clutch chatter/slipping
Originally Posted by Ranger
The issue is that you slipped the clutch too much on that launch and over-heated the rotating elements. Once cooled down it should be fine.
The LS2/LS7 clutch does not respond well to slip.
So it puts a premium on getting the clutch out fast on the launch.
Ranger
The LS2/LS7 clutch does not respond well to slip.
So it puts a premium on getting the clutch out fast on the launch.
Ranger
I revved the car to about 2,000 rpm then simultaneously let the clutch out and got on the throttle. It never hooked-up. The clutch slipped from the very beginning and the pedal only came out about 1/2 way (no wonder it slipped, it never engaged fully)! I've done this many times before without slippage or incident.
Race Director
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From: Central Florida
Originally Posted by tlacroix
I've been involved in racing most of my life and know what you mean, however, this was anything but a drag racing launch.
I revved the car to about 2,000 rpm then simultaneously let the clutch out and got on the throttle. It never hooked-up. The clutch slipped from the very beginning and the pedal only came out about 1/2 way (no wonder it slipped, it never engaged fully)! I've done this many times before without slippage or incident.
I revved the car to about 2,000 rpm then simultaneously let the clutch out and got on the throttle. It never hooked-up. The clutch slipped from the very beginning and the pedal only came out about 1/2 way (no wonder it slipped, it never engaged fully)! I've done this many times before without slippage or incident.
The reason mine does that is because I'm slipping the clutch by hitting the throttle while the clutch is not fully out.
Perhaps yours is different. But mine does it too.
But it never does that unless I slip the clutch.
I'm not happy with the LS7 clutch, which is made by Luk same as your LS2 version.
What you've discovered is a characteristic of the LS2/LS7 clutch that set it apart from the Luk clutch in the LS1/LS6 that accepted more slip before glazing.
Opinions vary.
Ranger
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Thread Starter
Instructor
Joined: Nov 2005
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From: Oceanside CA
Clutch chatter/slipping
You've described the problem exactly - but why. The clutch should tolerate some slipping in a C6, let alone a Z06!
The other strange thing is that I can't make it do it. Slip-it, drop-it, whatever, it works normally --- except once in a while, without warning! And, why does the pedal stick about half way up (or down)?
The other strange thing is that I can't make it do it. Slip-it, drop-it, whatever, it works normally --- except once in a while, without warning! And, why does the pedal stick about half way up (or down)?
Race Director
Joined: Aug 2000
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From: Central Florida
Originally Posted by tlacroix
You've described the problem exactly - but why. The clutch should tolerate some slipping in a C6, let alone a Z06!
The other strange thing is that I can't make it do it. Slip-it, drop-it, whatever, it works normally --- except once in a while, without warning! And, why does the pedal stick about half way up (or down)?
The other strange thing is that I can't make it do it. Slip-it, drop-it, whatever, it works normally --- except once in a while, without warning! And, why does the pedal stick about half way up (or down)?
One question for you. Are you doing a burnout?
Ranger
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From: Randolph NJ
I have experienced the same problem. With less than 700 miles I was accelerating (not high revs) and when I went to let the clutch out I felt that the pedal hung up. I pulled it up (or thought I was) with my foot and since then it has not occurred again, the car now has 1700 miles. I did call my dealer and mentioned that I had clutch chatter at low rpms when starting out in first or reverse when backing up. At first I thought it was simply a matter of bedding in or a chacteristic of a transaxle design. After reading your thread I no longer feel that way. Can anyone supply the information or where I can get it regarding the recall. My car is less than three weeks old.
Race Director
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From: Central Florida
I follow a rigorous routine of keeping the clutch fluid pristinely clean and fresh. So the issue with the clutch in my C6Z is not related to fluid issues. I've yet to have the pedal act up except on launch. And then it occurs only when the launch rpm is over 3000 on DRs AND I fail to make a very FAST clutch release. It has happened only once on stock tires in the same circumstances.
This clutch is less stout proportionately that the ones in my 2001 and 2002 Z06s which gave great service life at much higher launch rpms without complaint.
Ranger
This clutch is less stout proportionately that the ones in my 2001 and 2002 Z06s which gave great service life at much higher launch rpms without complaint.
Ranger
Race Director
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From: Central Florida
Originally Posted by LS WON
Corvette manual transmissions always have issues and the dealer will say it is normal. That's why they are selling more automatics.
I've had no tranny issues on six 6-speed corvettes. This includes the last three which are Z06s that I've put a combined 525+ passes on at the drag strip.
Ranger
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From: Oceanside CA
clutch chatter/slipping
Originally Posted by Ranger
Those are very good questions. I am both surprised and disappointed with the LS7 clutch.
One question for you. Are you doing a burnout?
Ranger
One question for you. Are you doing a burnout?
Ranger
My '66 GT-350HS which weighs just about what the Corvette does (on a scale - 3230 vs. 3200) and probably has 10-20 more horsepower. It will do burnouts from a standstill, without clutch slipping, starting in second gear!
I can certainly understand and have experienced clutch slipping many times, on many cars over the years, but the pedal never stuck 1/2 way.
Last edited by tlacroix; May 17, 2006 at 11:10 AM.
Safety Car
Joined: Oct 2003
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From: DFW Texas
Originally Posted by Ranger
I've had no tranny issues on six 6-speed corvettes. This includes the last three which are Z06s that I've put a combined 525+ passes on at the drag strip.
Ranger
Ranger
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From: Sapulpa Oklahoma
I have heard of "other" GM cars having the release bearing 'hang' on the collar and not let the pedal return all the way to the top. But this was usually due to high mileage and no service on bearing/collar. Should not be the case with low mileage.
Team Owner
Joined: Dec 2002
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From: San Francisco CA
Originally Posted by Ranger
Tranny issues in the C5/C6 generally relate to missed shifts by the driver and/or poor mainentance of the clutch hydraulics which yields incomplete release of the clutch on shifts.
I've had no tranny issues on six 6-speed corvettes. This includes the last three which are Z06s that I've put a combined 525+ passes on at the drag strip.
Ranger
I've had no tranny issues on six 6-speed corvettes. This includes the last three which are Z06s that I've put a combined 525+ passes on at the drag strip.
Ranger
More chance of human error or abuse.
