Since everyone seems to be having problems with high performance clutch units I figured I'd see what info I could find out to find a solution and I found one.
These problems were experienced by the cup cars and were fixed the following way. Enjoy

"There are a couple issues with the stock clutch system but none with the clutches hose being strong enough.
We did put in a remote bleeder hose, and a remote fill reservoir as the production car uses the brake master
cylinder reservoir for the clutch hydraulic system
as well. We have found an issue with the production quick disconnect fitting
in constant re-use; sometimes the internal seal can be dislodged, and then
you don't get disengagement, but that does not make the clutch slip. The
other thing that can happen is damage from additional pressure on the clutch
pedal. This can happen just from pushing on it hard all the way to the floor
when drivers get excited; this can push the internal pedal travel stop
(which is a nut on the clutch master piston shaft) so hard against the
clutch master cylinder housing itself (which is plastic) that it pushes the
master cylinder out of its locked position completely. The solutions are
careful assembly of the q.d fitting, and inspection and replacement if
necessary of the clutch master cylinder, and installation of a pedal travel
stop if the carpet is removed."

here are some pictures of the clutch pedal stop used in the Cup cars.

 

Thanks for the info but as usual, vague info from GM.

Which quick disconnect, there are 3!

If the plastic lines are ok, why did they replace them! Doh!

When you run that stopper, you better tell people how to adjust the clutch position switch!

What about Dan's car with CM set-up. His is fully engaged 1/2" off of floor! With that travel reducer in place his clutch would always be on!

 

they just need to recall this bullshit

 

This info is not from GM but im sure he is just referring to all the quick disconnects in the system.
As far as Dan's car, was all of the other solutions followed, which may result in his problem being fixed.
Like I said this is straight from the guys that are paid to make these cars win races so if I were to listen to anyone it would be these guys.

 

agreed somone should report it (i forget who you are supposed to report suff to) so they can investigate a recall. Mabey with the poll about how the stock clutches are holding.

 

Who has immediate acess to stainless steel braided clutch lines? If so, give them a try and let me know how it works out. If not, that will be my project for this week if the vacuum bleed on my clutch doesn't work out, and I'll let you guys know how it works out.

 

Im working on this now. Its why i started the poll in the first place.

I need more votes befor I can do any thin els.

Im doing some testing later today and will post what I find if its anything worth posting.

Later

 

We followed the GM clutch bleed and vacuum proceedure to a t where we held 27 inhg compared to gm's recommended 15-20...it is impossible for it to be a bleeding issue...it is elsewhere in the system and im 90% sure its in the hydraulics.

 

Additional Left out Info: (sorry lol )

"The LUK production clutch has to be pre-set in a press to engage the self adjusting fingers,. If that process is not followed after service the clutch can drag and not disengage properly. Virtually all of the repairs I mentioned do not cause the clutch to slip other than a displaced matter cylinder with a binding shaft…"

 

Has anyone tried these fixes yet? Any luck?

 

From what I can tell, the travel reducer is only used if you have the carpet removed.

Good luck figuring it out, I'll be watching for sure.

 

I contacted Mantapart about their cup cars, and this is what they had to say about the whole clutch ordeal. Notice how it's CC'd to john heinricy too.

Problem is probably the installed height of cover fingers, which are
affected by the thickness (increase causes cover fingers to drop more)
of the disk or efforts to upgrade clamping of the cover ( same effect
as above). You need to measure height before w/old clutch and after to
see if the fingers are lower. If so, shim the release bearing closer to
the cover accordingly.. thats the best we can say from here, MP

cc: john heinricy/gmpd

 

Any thing new?

Later

 

bump