clutch sticking?

Pharmacist

if i accelerate to redline in 1st gear under hard throttle and very quickly shift into 2nd and very quickly lift my foot off the clutch, i noticed that the clutch pedal sticks at the bottom position for a split second before bouncing back up. In other words, the clutch pedal doesn't bounce up the same moment I lift my foot off, but stays pressed down for about half a second or so before bouncing up. This doesn't happen at lower rpm, only at very high rpm near redline. It also doesn't happen if I shift slower and lift off the clutch more slowly. I haven't had a chance to redline in any other gear so i don't know if the same would happen.

370Zsteve

That never happens with my Mustang.

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Pharmacist

and your point?

Hugoneus

Ok, but what does that have to do with the 370z's clutch?!

2theextreme

Interesting.....I say try the same theory with the gas pedal....however this time....don't let off of it....even if you see a traffic jam forming in front of you. Report back....I'm in for pictures and details.

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Pharmacist

huh? u retarded or something? and don't come back

m4a1mustang

Omg... I have a lot of rep to disburse when I get home tonight!

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m4a1mustang

I swear I read about this a few months ago, though. Someone here was experiencing the same thing.

Was it after a hard launch?

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Pharmacist

yeah, it only happens during a hard launch. i tried searching the forum but nothing came out, so i started this thread.

m4a1mustang

Yeah, you probably overheated the clutch. I think this guy was at the drag strip and after a few launches his pedal would go to the floor and stay there.

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FuszNissan

That would happen.

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LouFuszNissan
ZDAYZ 2012

Pharmacist

no i dont think that's it. it happens during normal driving. i'd be driving normally and if the streets were empty like late at night for e.g. i may try a hard launch from a traffic light and it happens right there. i don't see a reason why the clutch would be overheated since i'm driving normally. also the pedal doesnt stick, it comes up. it's just that there seems to be a lag of a fraction of a second between me lifting off and the pedal coming up

///M-Power

This happened to me as well during a trackday. I purged my DOT3 clutch fluid and switched to DOT5.1 (take note of the .1 since DOT5 will destroy normal clutches) which essentially gives a higher boiling point threshold.

Pharmacist, I seriously doubt you have an overheating clutch issue. However, you might want to inspect if you have the proper clutch fluid level on your reservoir. If you have the correct level, then you might want to try a clutch fluid change first since that would seem to be the cheapest thing to do for now. If the problem still persists after the fluid change, then I suppose there is no other alternative but to open up your clutch and check for wear.

The clutch pedal is a master / slave hydraulic cylinder configuration so I doubt its a faulty spring issue. Also, you might have air bubbles in the hydraulic system.

By the way, were you able to fix your gear buzz / rattle above 5k rpms issue? I moved my shifter boot up and down countless times and I still suffer from the buzzing issue at high rpms. Don't really know what else to do.

Thanks!

FuszNissan

I don't think a split second under a hard load should be anything to be concern about.

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Pharmacist

is it normal? but why would it happen though? the clutch is spring loaded, so as soon as the force stretching the springs (i.e. my left foot) is removed, the springs should recoil and push the pedal back up immediately. in this split second, what is the force resisting the springs? is it possible that the large torque causes some minor twisting perhaps of the input shaft of the gearbox relative to the crankshaft or whatever that causes some friction and holds the clutch momentarily? at least that's my theory.