So I have a 2007 350z 6mt. Today it started acting very strangely, and I can't figure out why..

I first noticed this when I was on the highway in 6th gear at about 2500 rpm. I pressed the gas and it jumped to nearly 3000 for a second before falling down to where it should be. I couldn't replicate this every time I tried, but it happened a few more times. Eventually it jumped as high as 4000 rpm.

When it did this I thought I smelled clutch, but I was going about 75 so I couldn't be sure. On top of this, when I shift it is too smooth. I downshifted from 6th to 3rd without rev matching and there was no jerk like there normally is. Whenever I shifted gear whether I rev matched or not it felt like I'm driving an auto. Another thing I'm
Noticing is my clutch engagement point seems to be a little higher than normal. As of now, I have about 9000 miles on my clutch and flywheel, it's a competition clutch stage 1, and around 3000 or so on the slave cylinder.

My suspicion is clutch, but I'm not sure and I'm getting a bit worried about this. Any help is appreciated.

 

Sounds like the clutch, set the cruise control in also, and then use the accelerate button on the steering wheel and see if it shuts the cruise control off also.

 

I've done a couple of the slippage tests, on a flat surface at 30 in 5th or 6th gear I have no slip. But when I did that in 5th on a hill the rpms started rapidly bouncing until about 45 then normalized. Does that sound about right for slippage?

 

Slipping clutch.

 

Bye bye clutch

 

Well, that's what I get for choosing to buy a stage 1 clutch to avoid having to get the z speed slave. Gonna do it right this time...

 

Bad clutch. 5th gear at 30 mph may not slip, but at 60 it will.