Got my car back yesterday, with some new suspension adjustments. So of course I had to go out during the evening for a 1+ hour drive. Wow, another great improvement. The car is just getting better and better with each tweak I do.
This latest big change was with camber. To adjust the camber you need to use shims, which is a bit more of a pain than just switching a bolt on the sway bar, or turning a ring on the adjustable shocks.
Stock spec camber settings from Tesla are:
Front: 0.0 degrees
Rear: -1.8 degrees
The spec range is:
Front: +0.01 to -0.03
Rear: -1.6 to -2.0
I wanted to dial in quite a bit more negative camber in the front, to improve cornering grip and get rid of more of the understeer without sacrificing rear grip with a tighter sway bar setting in the rear. To that end I moved the rear sway bar back to the middle hole, put more negative camber in the rear, and quite a bit of negative camber in the front. I was more confident with this change given the tire temperature readings that was posted above by DaveF, which proved the front definitely needed negative camber.
So this is where I'm at now with all my settings.
Adjustable Shocks: 7 in the front, 10 in the rear
Sway Bars: outside (loose) hole in the front, middle (stock setting) hole in the rear
Camber: -1.0 degrees in the front, -2.0 degrees in the rear
This was another significant improvement over only the front sway bar setting change, which was the previous big win. So this is big win #2, in my opinion. There's still some understeer, especially at very low speeds. And if I used the car only for performance driving, it could probably use 1.5 or 2.0 degrees of negative camber in the front. For now I'm happy with the -1.0 I have dialed in now.
I'm looking forward to more data and tire temp readings from autocrossers, especially if you also add as much or more negative camber in the front as I did.