Transmission sounds like gravel in a tin can

[tominboise]

Backstory - 2006 Cayman S. 63k miles.  GT3 TB, IPD plenum, AASCO lightweight flywheel, Sachs spring clutch, Numeric shifter and cables.  Clutch and flywheel have around 500 miles on them.

 

Car is primarily autox and hill climb car.   We were autoxing this weekend -  after the last couple of runs of the day, the transmission began making considerable rattling noise while idling in neutral with the clutch pedal out.  The noise goes away when the clutch pedal is depressed.  I can't hear any noise when driving the car and it shifts and runs fine.

 

My co driver (my son) says that he was shifting from 1 to 2 during a launch and let the clutch out prior to having second gear all the way in and the tranny made a "funny noise" when he did so.

 

Any ideas?  Should I pull the tranny now and send it off for a specialist to look at, drive the car for awhile and see what happens?  Any other diagnosis I should do?

 

[JFP in PA]

22 minutes ago, tominboise said:

Backstory - 2006 Cayman S. 63k miles.  GT3 TB, IPD plenum, AASCO lightweight flywheel, Sachs spring clutch, Numeric shifter and cables.  Clutch and flywheel have around 500 miles on them.

 

Car is primarily autox and hill climb car.   We were autoxing this weekend -  after the last couple of runs of the day, the transmission began making considerable rattling noise while idling in neutral with the clutch pedal out.  The noise goes away when the clutch pedal is depressed.  I can't hear any noise when driving the car and it shifts and runs fine.

 

My co driver (my son) says that he was shifting from 1 to 2 during a launch and let the clutch out prior to having second gear all the way in and the tranny made a "funny noise" when he did so.

 

Any ideas?  Should I pull the tranny now and send it off for a specialist to look at, drive the car for awhile and see what happens?  Any other diagnosis I should do?

 

 

Typical one piece flywheel noise; when you removed the dual mass flywheel, you also removed all harmonic dampening from the system.

[tominboise]

I agree with you and I did have some increased noise from the tranny following the single mass flywheel install. But not at the level that appeared this weekend.    My main concern is if a tooth got chipped or something.   I will try it for awhile and see if it changes over time.

[JFP in PA]

4 hours ago, tominboise said:

I agree with you and I did have some increased noise from the tranny following the single mass flywheel install. But not at the level that appeared this weekend.    My main concern is if a tooth got chipped or something.   I will try it for awhile and see if it changes over time.

 

If you think you damaged the trans, drain it and check the oil; it should be full of metal if you wacked something.

[tominboise]

Ran it today without problems. Doesn't seem to make much noise when cold.  Makes more noise when hot.  I will change the gear oil and see what it looks like.