914-6 LSD, Did any 914-6 come with limited slip differential Options

[DennisV]

Did any 914-6 come from the factory with limited slip differential?

Based on what I see in the factory parts catalog, there is no reference to 914-6 that includes LSD.

If the answer is "yes" some came with LSD, is there a way you can tell by looking without opening the case?

[technicalninja]

Yes, when any clutch type limited slip diff wear out the clutches, the diff then starts working like an open diff.

And you have to disassemble the diff, and replace the clutches. It is not an easy job. It takes some patience to get the clutch pre-load correct.

I much prefer Torsen style diffs. No clutches to wear out.

That is an understatement!

I vastly prefer Torsens as well.
Only bad aspect of a Torsen is that it cannot be tuned. You cannot adjust how the clutches work because it has none.
Torsens are "road race" differentials in my book.
Drag racing requires a different approach and a standard clutch style or a true "locker" is usually better.

In the import world O.S. Gliken is the normal go to competition differential. These are completely adjustable clutch style and when you turn your Miata or S2000 into a track only car it is common to remove the Torsen (which it came with) and install a Gliken.

One thing to remember...
Clutch or Torsen vastly increases the temperature of the differential oil.
They only add the heat when they are functioning but if you're on a track where these are working a lot, adding some form of differential cooling is critical to the life of the differential. Clutches are far worse than worms in this respect but they both add big time heat.