360 Spider F1 Double Clutch (?) issue. Help please.

PIS = Point of Initial Slippage - as you say lots of threads mention it - its a measurement and the name is unusually self-explanatory (similar to biting point on manual car) !

It can be adjusted on the dealer's computer to some extent but some of your symptoms could also be associated with a worn-out clutch despite the % or the clutch position snesor

 

clutch worn out...you can have your PIS adjusted and try to drive still few thousand miles...

Cannot understand why 50% wear with 10K miles on the clock...that clutch has been abused.

 

The gearbox is set up to try twice to engage a gear if it has difficulty first time, then to bypass it if it can't select it.

Does this happen in every gear or just 1 or 2 gears?

 

Ok you are probably fine, but as an FYI I had something that stated out like that - it really only happened on one gear - 3rd gear selection, eventually became an issue that it bypassed 3rd gear all together - took about a year though before that happened. In my case 3rd gear synchro + selector fork was the issue - apparently from speaking to a number of mechanics because of the arrangement of 3rd and 4th gear in the box with one selector fork sliding over another it can cause wear on the shaft the fork sits on, and 3rd gear gets a lot of abuse when accelerating hard - FWIW I have been told most gearbox issues start on 3rd gear, and its usually a reflection of how hard the car has been driven as opposed to mileage, but others may have a view on this - mine had about 26K on it when the problem arose.

 

Clutch wear indicator is not very accurate.
I have 31k miles on first clutch and it shows 90% left, and I know I've smoked it a couple of times.

I've had the problem you describe as well - but only on hard acceleration.

 

I recently purchased a 360 with 28k on it and according to the PPI it had about 44% remaining. After 1500 miles and shifting from 1st to 2nd it would go into neutral every once in awhile. I had a 30k major done and the dealer said about 50% remaining. Then a few weeks ago it started to do this more often. At speed I went from 5th to 6th and it went to neutral. I took the car into the dealer and he said I needed a clutch because it was actually worn about 75%. I said how could I go from 50 to 75% in a few (50) miles. He said that someone must have put the wrong numbers in when they where doing something. He actually gave me a very long informational narrative that I really didn't understand. But when they dropped the gearbox and checked the clutch that is what they found. It hasn't happened since I had the clutch replaced.

 

Adjusting the PIS will sometimes cure the dropping into neutral.