My bet is the rubber-centered clutch hub is shot. What you describe is typical when this dampener has deteriorated beyond tolerable levels.
The solution is simple, but expensive -- time to upgrade to a spring centered clutch disc like the ones found on the 944 Turbo's. Cost: $1500.00 to $2000.00, depending on what else is found during the operation....
If your raise the car up, you should see a rubber plate on the forward side of the transaxle. Open this, and you should be able to reach in there and grab hold of the rod connecting the transaxle to the clutch. If you can move it up and down, side to side, then your clutch hub is shot and needs to be replaced. This is a very common failure on the non-turbo 944's, btw. Fix it NOW before you kill the rest of the driveline.
Also: why are you downshifting? Never, EVER downshift, especially to slow the car down. Brakes should be used to do that -- not the transmission. (Brake pads are far cheaper than clutches and transmissions...)
-Z-man.
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2010 Cayman S - 12-2020 -
2014 MINI Cooper S Coupe - 05-17 - 05-21
1989 944S2 - 06-01 - 01-14
Carpe Viam.
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