The LMPC and Prototype classes use the same tires (both IRL and in the sim), but the tires are made for DP loads, not LMP/LMPC loads, so you won't get temps that are as high in the Oreca (or probably traditional LMP2s). Optimum is 65-80C (which I'll be changing for the next update - just so that the range is a little smaller e.g. 70-80), while the optimum pressure is 30 psi. For our tires, I'd worry more about the pressure than the temps, since you can't really do much about the latter (track conditions play the biggest factor), but the former is easily adjustable - also that our tires don't really drop off a ton when you're only 5C under/over optimum range.
Also, just a general note on appropriate tire use:
TL;DR - Use Black tires except on tracks with very high speeds or high loads (Daytona, Indy, Watkins Glen, etc)
The "Black" tires are effectively a single stint tire used at most tracks. The "Gold" tires (which I haven't worked with much), should last about the same time -I don't think they currently do in the sim-, but are made for higher loads and speeds (for tracks like Daytona, Indy, Watkins Glen), thus they have a slightly different construction - you can actually visually tell because the ride height will change by a few mm when switching compounds. The Black tires have a softer construction but a stiffer spring rate IRL, the spring rates should be more or less correct, but I haven't worked on the "construction" of the Golds extensively yet.
