I'm having some issues with what I believe to be clutch slippage. However, in past experience, once the clutch had started to slip, it then went south rather quickly. In this instance, the clutch would slip when feeding power in the corners. The clutch never completely failed; even after a 3 day race weekend.
One friend thought it might be the diff clutches opening up... I believe that I have an OEM Torsen diff. These don't slip; do they?
"However, if one set of wheels loses traction completely, the Torsen differential will be unable to supply any torque to the other set of wheels. The bias ratio determines how much torque can be transferred, and five times zero is zero."
<p>A lot of 03 TF were set up incorrectly at the factory. Also we just said that the MSM has a TF but I think thats wrong. Its the same diff as the S2000 which has a torsen. I think the TF was in the 03 and up regualar Miatas. The MSM followed the trend of getting rid of extra old Miata parts.</p>
Lifting inside rear wheel? The OEM torsen will act as an open diff if one of the wheels has no traction at all.
Hard to tell from video, but this seems most likely. Looks like the car was bouncing when it slipped in the vid, and it was turning too, so this at least seems plausible. Clutch slipping is possible too, but seems less likely.
MSM has a bosch made gear type diff IIRC. Different from the Gleason made torsen in the rest of the cars, but the same type of diff. Its the unweighted inside rear spinning. Disconnect the rear sway bar and this will stop.
I can't speak for the msm diff but I know a factory 99 torsen can begin to slip with age. We've had a few go on some of our spec race cars, with only 130whp. They work fine except for really high load "aggressive" corners.
Torsens can wear out, but not in a way that will cause slip. There is some hardened washer that help keep pressure on everything that can wear down. Sadly there doesn't seem to be a source for replacement washers at this time.