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YOUR RESEARCHClutch slipping when cold
Leading reported evidence
Check ...maybe its not the clutch, throw out bearing
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Suggestion
Have it checked...maybe its not the clutch, throw out bearing?
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Suggestion
Like you have to use more RPMs to engage the clutch without pulling the motor down.
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I have an 02 C4S with 31k miles right now.
I myself am a new owner who has since put on about 1.5 to 2k glorious miles. I am good with rev matching on the up and down shift and am not a fan of stoplight burnouts.
The clutch does not grab like it should when I first drive it out of the garage in the morning. The slippgae is not severe; I just have to gingerly give it that extra 10% effort to modulate throttle/clutch action.
Even after a short drive to the gym (today) 2.5 miles down the road, once the car sits for 40 mins and I start the car and move off, the clutch functions as normal. Once I start the 911 up say the next morning, same deal al over again.
I'm asking my 911 brethren here whether this is a simple adjustment or if I am in need of a new clutch or what.
At the point of engagment I need to give it a bit more throttle and avoid letting up the clutch to quick just enough before I get forward motion... classic clutch slippage but again everything cool once car is warmed up.
Do the RPMs swing higher than normal under acceleration when your foot is off the clutch when you are experiencing the problem?
What you described sounds more like clutch grabbing.
once it grabs, it's grabbed
just that point of engagement i gotta feel it out a bit more before releasing the clutch.. this is all in a span of a few milliseconds but def noticeable v. when warmed up and normal
Sounds like a slightly burned friction plate (beween the flywheel and the pressure plate). If it dosen't bother you, live with it, but next time you have it in for any service, have someone look at it.
When the car is cold, go through gears into at least 4th and give it big throttle (over about 4000 RPMs). Does the motor run away without pulling the car. If it does not, then I don't think you have clutch slippage. What you are describing doesn't sound like slippage. Sure test is WOT in higher gears.
If the clutch eventually grabs, it is most likely NOT the clutch disc or plate but the hydraulic system. May be a dirty slave or even a bad actuator arm inside the box. Have you ever bleed the sytem completely?
I would say have it looked at, I drove mine around for about 2000 miles with it slipping only slightly while waiting to have it replaced. The result was that I had to buy a new flywheel which was expensive. I too tend to think it is not the clutch but whatever it is I would find out!
, I give up, I read a couple of times and I dont understand. 10% more pedal effort when cold? Makes sense if this is the problem, the fluids are at their coldest and thickest requiring more effort. Slipping part I dont understand, you are giving it more gas to go forward?
When you let go of the clutch and push in the throttle to move, it should grab so you don't have to finesse the throttle... when cold, I have to finesse it by holding it down for a longer period or slightly giving it more gas before I fully let go of the clutch pedal... tough to describe.
This description sounds much more like a cold engine that doesn't want to be put under load off idle. Like you have to use more RPMs to engage the clutch without pulling the motor down. Lack of power is forcing you to slip the clutch to start the vehicle when cold. Maybe power problem rather than clutch? Yes? No?
I highly doubt it's the engine, wdonovan. It drives fine once the tranny is matched up with the engine. The sensation really comes from the clutch... not sure I want to open up a bigger can of worms before I get this sucker dropped off at my indy. I appreciate you looking at a variety of other factors, though.
My engine leakdown/compression came out pegging on all cylinders during a recent PPI. It's a brand new engine only 17K miles old straight from Porsche installed at a Porsche dealership. It runs healthy.
