I have a new SPEC aluminum flywheel and stage 2 clutch. I am now experiencing a vibration from 4500 RPM to 5500 RPM. I also hear a metallic rapid clicking noise when the transmission is in neutral and the clutch is engaged. Disengage the clutch and the noise stops. Now I must remove the parts and send them to SPEC for them to check. SPEC said that the clutch & flywheel were balanced before they shipped it to me. Has anyone had this problem before??

I just got this interesting related info from the C5 Tech from a member, C6 Problem? :

Look... I literally poured over the forums after getting into this issue. I called 21st century, A&A, Lingenfelter, MTI, ECS, and Cartek to talk to all the top of the line Vette tuners. All said that it can be a problem w/ LSX motors. They said that most are fine, but some can and do need a match balanced clutch. Seeing as how there's so much labor involved in the process I'd want to make sure mine's right.

Step 1 take stock clutch assembly to machine shop and have it spun up. If it spins out balanced then yuo're fine. But if not then you know it's off to compensate for the motor. It's really very simple.

I know for a fact that my stock clutch ended up being 8grams off and now after matching it the car is like stock again.

Talking to the tuners they always balance a clutch even when new b/c they're not always zero'd eventhough the mfgs say they're supposed to be. Some are as much as 40 grams out. This is comming from lingenfelter.

 

They are all correct. I was replacing the throw out bearing and found the pilot bearing missing. It tore up the bearing in the trans also. The vibration would go away if you depressed the clutch and the assembly would center it self. Just an idea.

 

Did you replace the slave cylinder?

 

The dealer did the installation and no they did not replace the slave cylinder. My C6 has 10K miles on it so I do not think it should need to be replaced.

 

Did you install a SPEC clutch & flywheel?

 

After experancing vibrations between 4500 RPM & 5500 RPM I told SPEC that there was a big problem with the clutch & flywheel with only 300 easy miles on it. The service person at SPEC said that this was a clasic out of balance condition.
I had to have my Chevy dealer remove the SPEC unit. They found uneven flywheel clutch disk seating area & hot spots on the pressure plate. I called LGM and they shipped me a Textralia OZ700 aluminum
flywheel & clutch. My dealer did the install and the vibration is gone.
I returned the SPEC unit to SPEC and told them that it must be out of balance because the Textralia works great.
I also told SPEC that I want my money back. SPEC refused. 40 days after SPEC received my unit they called and said that they tested it and it was OK. I again told them to keep it. I also asked SPEC if they thought that my Corvette was on the lift for 40 days waiting for them to return my flywheel & clutch

 

did you get a refund from spec?

 

Not cool of SPEC. I have the spec 3/alum in my C5. Great performer for 10k so far.

 

I purchased the SPEC unit from Speedinc and they were trying to get credit from SPEC for the last month. At one point, a week or so ago, SPEC told Speedinc that they did not receive my unit that I FedExed them. They received it on Dec. 8th. I had to send them my FedEx shipping info. Two other bigtime tuners told me that they had problems with SPEC and had stopped using their hardware. Balance was always the issue. The way I understad Fidanza at one time built the aluminum flywheels for SPEC and they were good products. Now SPEC builds there own aluminum flywheels for the C5& C6. That may be the problem
Too bad because it cost me a lot of money & time with my C6 needing a clutch installation two times and the cost of FedEx to get the new Textralia OZ700 to the dealer to get it off of the lift.
LG Motorsport & Textralia helped me out big time by getting me my new OZ700 next day shipped.
Speedinc has agreed to credit me but I do not like the idea of them getting stuck with the cost due to SPEC's screw ups. I do not have a problem with Speedinc. They are trying their best to deal with SPEC.

 

I have heard nothing but good things about the Textralia clutch, what are your thoughts on it so far? How is the driveability?

I had my stock clutch replaced under warranty at 3000 miles and now I am experiencing the same "I also hear a metallic rapid clicking noise when the transmission is in neutral and the clutch is engaged. Disengage the clutch and the noise stops" and this is with the stock Chevrolet replaced clutch. I have taken it back to Chevy a few times and they tell me that it is "normal drivetrain chatter." Which is total BS a brand new Corvette should not make clicking noises from under the car!

 

I have taken out more SPEC clutches that where pieces of crap! Most of them welded the disk to the pressure plate. These clutches have been an issue for years! Why doesn't SPEC address there problems already??

 

I had the same issues with SPEC as well. They wanted nothing to do with the problems I was having. Now I have a $450.00 paper weight sitting in storage. I wouldn't feel right selling it to someone else.


Dave

 

I have heard about nothing but problems with Spec clutches.

 

At this time I can not give a long turm report on the Textralia clutch and aluminum flywheel because I only drove it 35 miles home. The snow was beginning to fly in upstate NY and the Vette is up for the winter. All I can say is the high RPM vibration is gone as well as the clicking. Call LGM and talk to Anthony or Mike about SPEC & Textralia.
The flywheel is high tech and as light as can be. I think it is about 11 LB. Driving with the aluminum flywheel gives the feel that you have more power. I trust LGM that I will love it come summer.
Go to this Australian LS1 Forum if you can:
www.1s1.com.au/forum/showthread.php?t=43071

 

That should be: Austrailian LS1 Forum

 

Thanks for the help. If you get to the web site go to Textralia's New Flywheel
Also the January 2006 VETTE has a write up called "A Weight Off My Mind" on page 54 about aluminum flywheels in general.

 

I first told the person that does the service at SPEC that I was going to return it and wanted my money back. He said no problem. 40 days after I returned it I got a call from Paul ? ( I think he is the owner. He could be Paul SPEC if there is such a person). Paul asked me where I wanted my unit shipped. I told him that he was to keep it and asked him if he thought my Corvette was setting on a lift for the last 40+ days waiting for his call. Was this Paul the same person you talked to?

 

Racin ZO6, What was the problem with your SPEC? You should try again to get your money back. I got good news yeaterday. SpeedInc. called and they said that SPEC finaly credited them and now I will get my money back. Do you think SPEC reads the Corvette Forum?