mittens

Ok, my clutch does not slip, and feels good. no problems with a quick burst or anything.

BUT if i say kick it on the highway 4th gear run, and maybe some 5th... the clutch pedal gets squishy for the first 1/2 of the pedal or so.... but once you let out and push it once or twice its fine again??

the car is not slipping the clutch. holds good. so confused on what would casue this.???

clutch fluid is not dirty.

mittens

Also a note, I do not have the clutch pedal spring installed, and I am not talking about slamming a gear and then it does this. I can have it in 4th and make a pull from say 3000-6500 and it pulls good. no slipping or reving. but when i go to push the clutch in at 6500 it works but the pressure is not at the top... shift to 5th nice and easy and roll into it and its a little worse after some 5th gear running. Car makes 438 to the wheels. has 50k on it, (just turned.)

mittens

really 62 views and no replies.??

Hoonose

Replace spring and see.

Do a series of clutch fluid change outs and see.

PRE-Z06

The higher the gear, the more the strain on the clutch from a disadvantage mechanically and because of mechanics. It doesn't sound like your clutch is full on slipping, but it sounds to me like it is starting to slightly and the slippage creates heat which weaken the diaphragm springs and doesn't allow them to function properly fully disengaging the clutch. I'd recommend a replacement before it does any damage to the the tranny from grinding while trying to shift fast as it'll only get worse.

DSOMC6

I recall a thread several years back regarding the early C6's (I had an 05 MN6).

The thread was in regards to the clutch going to the floor at times due to losing fluid pressure at high RPM's (or something of that nature). Do a search.

mittens

did a search and all teh threads are all about clean fluid...

mittens

also not sure how the clutch can KINDA slip on the higher gears... i would think if the clutch let go at all under power, its going ot let go the rest of the way... its takes more power to make the clutch slip in the first place then to take a already slipping clutch and spin it to red line.

LEAVINU

I do numerous airstrip events and had issues like this at 500rwhp. Swapping out the stock LS7 clutch for a real aftermarket clutch eliminated that problem. No more clutch drama for me when running cars with 100+ more hp.

PRE-Z06

You are on the verge of over powering it, there is more strain from increased aero drag and reduced gearing multiplication to propel the car at higher speeds/gears causing it to be more noticeable. Does it still chirp the tires when shifting?

FNBADAZ06

My clutch has 60K miles on it and when I'm shifting into 5th at WOT ,the pedal is usually only half way up....just like my drag race launches. The combination of making full power ( low IAT, plus ram air effect), along with the aero drag, causes the pressure plate to heat up and give me the symptoms of a drag race launch. No doubt the clutch is starting to slip in this extreme speed environment creating heat and deforming the pressure plate fingers. I can get the same thing rev matching my downshifts and engine braking for corners during HPDE's

Joe_G

Mine does the same thing. Been doing it for years, and currently has 57,436 daily driving (stop and go) and 449 hard drag strip runs on it.

Nothing a couple of pumps of the pedal can't cure.

mittens

Yea mine will still chirp 2nd and 3rd... And it goes away after you pump the pedal once.. Just wondered what it was... I understand it more strain and stuff I know how the whole clutch work been there a few times replacing on my trans am... Just still think if it slips at all the power would spin up to red line not still hold like normal... But who knows I have been wrong before.