I'm starting a new wip thread, because it's actually becoming a mod.
Still i can't promise simulation, but you can see in this video it's huge improvement over stock physics, though nothing in tyre.java was changed, only added 🙂
if you want to try it, add these lines in tyre.java(i'll not tell where)
Spoiler:
w.setCPatch(tyre_width/2,CPatchMaximumAngle, 0.0);
w.setPacejka( 15, 1000.0 );
w.setPacejka( 16, 1000.0 );