I've got a 03 Z, just gotten the clutch (exedy) and flywheel (f1 racing)....thats where the problem started. My mechanic told me the aftermarket flywheel is slightly shorter then the oem one to begin with. The problem is now that starting off at 1st gear it seems that the clutch catches as normal, apply some gas and it loses the catch.....rpm rises to about 3500rpm, release gas and slowly apply gas then it catches normal. Same problem from 1-6 gear, I know there is a break in point for new clutch jobs but something like that I've never heard before. My first time using a aftermarket flywheel.....am I making any sense to you guys??

 

Yes this makes sense kind of. The clutch friction surface should hold the flywheel regardless of brand clutch or flywheel.

 

Mine was the opposite... It was like super catch, engaged or disengaged, and with the new high pressure plate it was like 3mm of difference between the 2.

 

That is some sort of slipping... maybe a surface could have oils on them.

What do you mean by shorter, diameter or thickness.

If it was diameter, your starter probally wouldnt work.
If it was thickness... i dont see that working the way it is supposed to... Hence your problem.

 

I just spoke with my mechanic and he said the differences is in thickness....

 

The clutch disc rides on a splined shaft, so a little difference in thickness of the flywheel shouldn't make a difference. What will make a difference is the position of the release fingers on the pressure plate with respect to the throwout bearing, fork, and pivot ball.

If the fingers are too far forward, the ends of the fork have to slide further on the the back of the throwout bearing as it moves forward to disengage the clutch. That extra movement could lead to binding, which could lead to slipping as you let up on the pedal and add throttle.

In the stock setup, the angle of the clutch fork is very close to 90 degrees with the splined shaft coming out of the transmission throughout its movement, and there's not much sideways motion. Once you get a few degrees away from 90 degrees, the sideways motion increases.

Did the installation instructions call for putting any kind of lubricant on the throwout bearing and fork?

 

No, but when I test drove my car I guess I can deal with the issue. Now the other issue that came up is that the clutch pedal feels as though it's suck to the floor when I release but it's actually moving back slowly? How do I fix that problem? We tried adjusting the pedals but no luck, it gets worst for I'll have to release it at the highest point....