clutch slipping during track days

ResIpsa

Can you give a more detailed explanation of exactly what you are perceiving?

29K seems really early for a clutch. A much more common problem is with boiling clutch fluid/slave cylinder failure/master cylinder failure (I know that I have had all 3 fail at the track).

I also know each time I brought my car into the dealer they tried to sell me a new clutch. I had to insist that I knew my clutch was fine. I can only imagine how many clutches Nissan/Infiniti have sold after misdiagnosing burnt up clutch fluid.

Can you stall your car starting in 3rd gear? That's a fairly accepted test of a clutch.

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BGTV8

Do we have a terminology problem here. It sounds to me like the clutch is not dis-engaging drive when the clutch pedal is fully depressed which is what makes the shift "slow and/or difficult".

A slipping clutch says to me that engine revs rise and speed does not rise in proportion so the clutch is not effectively engaging drive as the friction surface on the drive plate is worn excessively.

A dodgy CSC on the other hand will not disengage the clutch making shifts difficult and/or slow. This can be variable if the fluid becomes excessively hot - and the pedal function returns when it cools.

Can the OP confirm the symptom more clearly because if the issue is having to spend a lot of time with clutch pedal fully depressed, that sounds like a CSC or fluid issue rather than a slipping clutch.

Before changing the CSC, simply replace the clutch fluid as step 1.