So, the next thing I did was start to look at the internals themselves. They've gone to a new type of friction disc material. I'm not quite sure what it's made out of, but it's a new approach for sure. Maybe they are getting their friction materials from brake technologies. I don't know. If you look at the picture, not only is it some sort of fiber material (reminiscent of the 933 carbon friction discs) but it's "pucked" with the friction material attached with some sort of adhesive:
If you look closely you can see that there's wear on the plates, so it appears that it does bite marginally better than the brass being used in the GT3 LSD:
But what really stood out to me was the size of these parts. They are teeny. Like 904 LSD teeny!
Versus the old 1970 911 LSD (from a car with roughly half the horsepower of a modern Cayman S):
Versus a modern day GT3:
It just doesn't strike me as very much friction surface for locking this thing. But if you look at the ramp angles, they don't really intend this to have all that much lock:
versus the old 40/40 angles of the 911 LSD:
So what's the plan from here? Redesign it so that it works. This came out of an Interseries car that had one season of racing on it. The car owner reported that he was spinning his inside tire for pretty much the second half of the season last year and was effectively running with no LSD. Guys tracking these cars seem to be burning them up really quickly. You could restack them with the friction discs further split apart for more lock up but the ramps are still really gentle. I don't think as it stands it would be much better for a racing application, but may be just fine for a street car. Regardless the wear surfaces are really thin to start with and there's just not ever going to be a really long life out of these LSDs.
Our attitude is that there's really no reason anyone who's got one of these units should have to throw it away, so we're going to make parts for it, and at the same time improve it. And having recently gotten our hands on a PDK LSD, it's effectively the same design and same parts, so it will take care of those owners as well.
Please feel free to add your own analysis to what you are seeing and ask any questions that might come up.
Guard Transmission LLC