It is the same as on grass. Wheel spin creates heat in the tyres as if it was on tarmac so still some work to be done with CSP.Yeah without the box ticked it looks like it doesn't really affect anything other than visual. With the box ticked(the car here was a VRC LMP1 car) light drizzle takes a while for the track to start to be effected, once it started to rain heavier you start to get more feel that its wet, but going from "its manageable on slicks" to "**** this needs wet tires" for me was like very sudden in the middle of the lap. Maybe the dampness changed drastically around a long lap at Le Mans....
I also noted the AI cars doesn't seem to be affected much at all. Around the time I pitted for rains and was doing wet lap times the AI set the fastest lap of the session....
Was wondering if something needed for AI to be affect by rain as well...
I also thought it was kinda weird that if I run the slicks in the wet, I actually overheats the rear tires just but driving from I guess, wheel spin? Not sure thats how that supposed to work...
I tried forcing all cars to have extended physics with this in the car.ini:
[HEADER]
VERSION=extended-2
It was the only way to get the cars, including the AI to have rain tyres. Certainly it did feel like driving in the wet but the AI could not handle it when the track became wet.
Someone mentioned before, the checkbox in CM also enables the same, I wonder if leaving the checkbox "unchecked" but enabling in each car.ini would work?