I'm WIP with X1 physics.
These days I explore the highest engine power GP4 can handle.
I use sets of "physics engine power" + "performance" + "engine torques"
Each pack is edited to a specific engine power data.
1483bhp is not working for all cars.
1400bhp is not working for all cars. Rear wheels spin on high gears - I think this is strange, should occur the opposite?
1300bhp works for AI cars but not for player. Player's car still spins the rear wheel on high gears and cannot get to full speed.
1200bhp works for AI cars and for player on nedium downforce circuits. On low downforce circuits like Monza, rear wheels still spin.
Going to test with even less power, may be 1150 will work... everywhere.
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some of my GP4 works ...