Hey guys! I just wanted to tell you I found the solution! When you input your desired BHP power in physics editor, it won't affect your car unless you uncheck player car performance team dependant in GPxPatch! As simple as that...
Instead I lost completely which problem is it, actually. I mean, if u want fix power or not just uncheck/check the option in editor and gpxpatch. The physic should be the same for all cars, I think. Otherwise why there is a FIA rule? Anyway. I am happy you've sorted it.
I use the 1.01 , cause I found that for first. However if u want use the physic file with GPxPatch directly, you need the 1.03 saved, otherwise rpm doesn't work with old version! That's meaning you need also convert the value for downforce coefficient, cosy expressed in other units. from the (value 1.01 / default value 1.01) * 1984.14 .