94 Leather Package question

My stock '95 with a Torsen LSD provides plenty of horsepower to spin the wheels.

Two ways to check:

1. Put the car up on jack stands and slowly rotate one rear wheel; note if the other one rotates in the same or in the opposite direction. This will indicate whether or not you have the Torsen LSD, but I can never remember which is which. Help, someone?
2. Find a piece of relatively slippy/loose surface (hardpack dirt is good). Stop, and launch with enough power to induce wheelspin (but not oodles of power; no need to spray dirt all over the place). Examine your tiremarks. If you left two big skidmarks where the tires broke traction, you have LSD. If you left one, you don't.

That's a useful test for a clutch-pack LSD (Positraction).Torsens don't work that way.

An open diff may leave two patches if traction is similar for both wheels. A better test is one wheel on pavement, one wheel on dirt.

But all U.S. '94 C packages came with Torsens. I suppose there's a theoretical chance a previous owner swapped it for an open diff, but I've never heard of that actually happening. Miata Torsens are pretty reliable unless asked to handle more than about 250 hp.