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noise with clutch below 1,500 RPM

  • 2005
  • 911 Carrera S
Mileage: 
23 600
Transmission
Calgary, 
Alberta

I have a 2005 911, a C2S launch edition 997 with PCCBs and a manual six-speed and I absolutely love it but have one problem: it sometimes, but not always, makes a loud scraping / lurching noise while accellerating in first gear when the engine is below 1,500 RPM but nowhere near stalling, typically between 1,000-1,500 RPM. It only happens perhaps 25% to 50% of the time when accelerating from a stop and never happens while driving or if I make sure the engine stays above 1,500 RPM when accellerating slow or hard in first gear from a stop. I am certain there's a mechanical problem but assume it's not a major one as the sound is only now-and-then. I also wonder why it's not heard at higher speeds? I bought the car at 11,000 miles, it has 23,600 miles on it today it and went off CPO warranty less than two years ago. The only other real issue the car has had in the past, which is probably unrelated, is a failed alternator at less than 16,000 miles, which was unfortunate but replaced by the local Porsche dealer for about $2k. Otherwise the car has been very fun and reliable. Thanks in advance for any thoughts you may have.

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