Question regarding C6 Z51 launch.
Thread Starter
4th Gear
Joined: Jul 2006
Posts: 4
Likes: 0
Question regarding C6 Z51 launch.
Hello, I currently own a 2005 C6, Z51 6-speed. I've talked to other Corvette owners and nobody has experienced the same issue I have.
The issue occurs when I rev the car up to (around) 3,500 rpms. The clutch is then released and the car shoots off the line. The only problem is that when I release the clutch, often times it will "stick" to the floor but will still accelerate and I have to slow down to allow the clutch to release. Additionally, this occurred in the Competition setting, which may be interfering to prevent wheelspin in this way. Any input would be appreciated.
Thanks! I have a video of this as well, not sure how to post it.
The issue occurs when I rev the car up to (around) 3,500 rpms. The clutch is then released and the car shoots off the line. The only problem is that when I release the clutch, often times it will "stick" to the floor but will still accelerate and I have to slow down to allow the clutch to release. Additionally, this occurred in the Competition setting, which may be interfering to prevent wheelspin in this way. Any input would be appreciated.
Thanks! I have a video of this as well, not sure how to post it.
Team Owner
Joined: Aug 2003
Posts: 38,314
Likes: 35
Originally Posted by c36wfl
Hello, I currently own a 2005 C6, Z51 6-speed. I've talked to other Corvette owners and nobody has experienced the same issue I have.
The issue occurs when I rev the car up to (around) 3,500 rpms. The clutch is then released and the car shoots off the line. The only problem is that when I release the clutch, often times it will "stick" to the floor but will still accelerate and I have to slow down to allow the clutch to release. Additionally, this occurred in the Competition setting, which may be interfering to prevent wheelspin in this way. Any input would be appreciated.
Thanks! I have a video of this as well, not sure how to post it.
The issue occurs when I rev the car up to (around) 3,500 rpms. The clutch is then released and the car shoots off the line. The only problem is that when I release the clutch, often times it will "stick" to the floor but will still accelerate and I have to slow down to allow the clutch to release. Additionally, this occurred in the Competition setting, which may be interfering to prevent wheelspin in this way. Any input would be appreciated.
Thanks! I have a video of this as well, not sure how to post it.
Le Mans Master
Joined: Nov 2005
Posts: 5,835
Likes: 6
swap out the clutch and trans from a new GT 500....
You'll find similar reports in the Z06 discussion area. I think it's the same clutch and what does not work well in the C6 certainly won't in the Z06 with more hp.
The clutch, IMO, is simply not up to the task at hand and should be replaced by GM with a new design. The Z06 boys talk about replacing it and changing the clutch fluid at crazy frequent intervals-all to try to keep a poor design functioning at least marginally.
Perhaps if/when the T6060 manual replaces the T56 the clutch will be improved?
BTW-your 'Z51' clutch behaves the same way my 'Corvette C6' clutch behaves. They are identical. You have a small gear difference in your trans and that's all. It is not the cause of your clutch problem.
IMO all. No car is perfect. The clutch is a weak point of the C6 from my own experience and experience of others. Of course, now get ready for the posts from people who have no problem with theirs.....lucky them but if a poorly designed part sometimes works as it should it does not prove all will....
The clutch, IMO, is simply not up to the task at hand and should be replaced by GM with a new design. The Z06 boys talk about replacing it and changing the clutch fluid at crazy frequent intervals-all to try to keep a poor design functioning at least marginally.
Perhaps if/when the T6060 manual replaces the T56 the clutch will be improved?
BTW-your 'Z51' clutch behaves the same way my 'Corvette C6' clutch behaves. They are identical. You have a small gear difference in your trans and that's all. It is not the cause of your clutch problem.
IMO all. No car is perfect. The clutch is a weak point of the C6 from my own experience and experience of others. Of course, now get ready for the posts from people who have no problem with theirs.....lucky them but if a poorly designed part sometimes works as it should it does not prove all will....
Team Owner
Joined: Aug 2003
Posts: 38,314
Likes: 35
Originally Posted by OregonC6
You'll find similar reports in the Z06 discussion area. I think it's the same clutch and what does not work well in the C6 certainly won't in the Z06 with more hp.
http://forums.corvetteforum.com/show....php?t=1488627
Originally Posted by OregonC6
The clutch, IMO, is simply not up to the task at hand and should be replaced by GM with a new design. The Z06 boys talk about replacing it and changing the clutch fluid at crazy frequent intervals-all to try to keep a poor design functioning at least marginally. Perhaps if/when the T6060 manual replaces the T56 the clutch will be improved?
Originally Posted by OregonC6
BTW-your 'Z51' clutch behaves the same way my 'Corvette C6' clutch behaves. They are identical. You have a small gear difference in your trans and that's all. It is not the cause of your clutch problem.
Z51 envy. 
Originally Posted by OregonC6
IMO all. No car is perfect. The clutch is a weak point of the C6 from my own experience and experience of others. Of course, now get ready for the posts from people who have no problem with theirs.....lucky them but if a poorly designed part sometimes works as it should it does not prove all will....
Last edited by '06 Quicksilver Z06; Nov 25, 2006 at 08:07 PM.
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Melting Slicks
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From: Eastern PA:ECS Paxton Novi 1500(676rwhp,585tq on stock engine),LG headers, 410's, Corsa Sports, ECS Alky Kit
St. Jude Donor '08-'09
Originally Posted by OregonC6
BTW-your 'Z51' clutch behaves the same way my 'Corvette C6' clutch behaves. They are identical. You have a small gear difference in your trans and that's all. It is not the cause of your clutch problem.
Team Owner
Joined: Feb 2000
Posts: 53,524
Likes: 77
From: Arizona
Originally Posted by c36wfl
Thanks for the help, I appreciate it.
I don't abuse the car in this way all the time, it is only every once in a while that I do drop the clutch.
Guess I'll have to get this checked out, thanks again.
I don't abuse the car in this way all the time, it is only every once in a while that I do drop the clutch.
Guess I'll have to get this checked out, thanks again.
Change out your clutch fluid. For $4 worth of DOT4 clutch/brake fluid (enough for many fluid changes), it's a less than 10 minute job to replace the reservoir fluid. Do a search for forum member 'Ranger' for more details.
Secondly anything to reduce clutch throw will help. I used this 50 cent window track lock:
http://forums.corvetteforum.com/phot...00/ppuser/6747
It clamps onto the clutch arm, shortens the distance you can push in the clutch, and effectively reduces clutch throw.
I was not thrilled with bringing my car into the dealer, as they have never done clutch work on a C6.
Team Owner
Joined: Feb 2000
Posts: 53,524
Likes: 77
From: Arizona
Originally Posted by johnodrake
The TSB says to replace the clutch if built prior to the following date code :4M13A/B/C
Anyone know how to decipher the date code into English?
Anyone know how to decipher the date code into English?
http://forums.corvetteforum.com/show...utch+date+code
post #10
Team Owner
Joined: Aug 2003
Posts: 38,314
Likes: 35
Originally Posted by johnodrake
The TSB says to replace the clutch if built prior to the following date code :4M13A/B/C
Anyone know how to decipher the date code into English?
Anyone know how to decipher the date code into English?
The date code is located on the pressure plate cover as shown above.
Replace the clutch kit (see part list below) if the date code on the pressure plate is PRIOR to the following date code:
- 4M21A/B/C for CTS-V and SSR
- 4M13A/B/C for Corvette
The date codes are interpreted as follows:
- The first character is the year.
• 4 = 2004
• 5 = 2005
- The second character is the build month.
Important: The letter J is not used in the month code.
• January = A
• February = B
• March = C
• April = D
• May = E
• June = F
• July = G
• August = H
• September = I
• October = K
• November = L
• December =M
- The third character is the day of the month.
- Important: It is possible that the fourth digit, the shift code, may not be present on the date code. The shift code does not pay a critical part in determining a suspect clutch kit.
The fourth, and final, character is the shift code = A/B/C.
Parts Information
Part Number
Description
Qty
12581713
Plate Asm, CLU Press & DRVN (W/CVR)
(CTS-V and SSR)
1
24233084
Plate Asm, CLU Press & DRVN (W/CVR)
(Corvette)
1
Thread Starter
4th Gear
Joined: Jul 2006
Posts: 4
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Originally Posted by DSOM Z51
Enough is enough.
To everyone else, Thanks. You have been very helpful in giving me an explaination regarding this small problem.
I guess my only other question is that will failure to repair or replace these components cause problems in the future?
Team Owner
Joined: Aug 2003
Posts: 38,314
Likes: 35
Originally Posted by c36wfl
I am new to this forum and cannot agree more with your reaction to this guy's comments. His Z51 rant prompted me to look back at my original post and find at what point I mentioned the Z51 clutch somehow being superior to that of the "normal" C6. Couldn't find that point.
Originally Posted by c36wfl
To everyone else, Thanks. You have been very helpful in giving me an explaination regarding this small problem.
I guess my only other question is that will failure to repair or replace these components cause problems in the future?
I guess my only other question is that will failure to repair or replace these components cause problems in the future?
Team Owner
Joined: Feb 2000
Posts: 53,524
Likes: 77
From: Arizona
Originally Posted by c36wfl
To everyone else, Thanks. You have been very helpful in giving me an explaination regarding this small problem.
I guess my only other question is that will failure to repair or replace these components cause problems in the future?
I guess my only other question is that will failure to repair or replace these components cause problems in the future?
But I never replaced mine, and all is well 2 years later.
I just might have it done before my warranty expires...
Banned Scam/Spammer
Joined: Aug 2005
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From: 41-33 Cry it out Koko!!!
St. Jude Donor '08-'09-'10-'11
Humorous
Originally Posted by us2bsrt
LOL.. 
He gets them so jacked up!
I think he adds alot of humor to the same old threads.
Lighten up peeps!
Last edited by ZeusC6; Nov 25, 2006 at 06:15 PM.
Safety Car
Joined: Dec 2005
Posts: 4,157
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From: North Carolina
St. Jude Donor '07-'08-'09-'11-'12
Originally Posted by DSOM Z51
The reason why you couldn't find it is because its not in there. But in any event, I am glad that we were able to help you.
I am sure that I speak for all here who are technically knowledgable, know these cars, and made a sincere attempt at helping you with your problem when I say: You're welcome.
I am sure that I speak for all here who are technically knowledgable, know these cars, and made a sincere attempt at helping you with your problem when I say: You're welcome.
You're a class act DSOM Z51. It's a long way off but Im buying you the cold ones at Carlisle.
Team Owner
Joined: Aug 2003
Posts: 38,314
Likes: 35
Originally Posted by Craigster05
You're a class act DSOM Z51. It's a long way off but Im buying you the cold ones at Carlisle. "I am new to this forum and cannot agree more with your reaction to this guy's comments. His Z51 rant prompted me to look back at my original post and find at what point I mentioned the Z51 clutch somehow being superior to that of the "normal" C6. Couldn't find that point.
To everyone else, Thanks. You have been very helpful in giving me an explaination regarding this small problem."
Knowing that we helped a fellow forum member who is relatively new here is indeed something to get "jacked up" about.