Go to data file, open ai.ini in notepad.
Put in:
HINT_x multiply the radius of the corner seen by the AI. Useful when AI is too fast or too slow in a corner.. usually due to compression/decompressions but there could be other reasons such as hairpin with long straight after and where the AI is going in too hot loosing in exit speed.
BRAKEHINT_x changes the AI idea of how hard it can brake in that zone.. again some compression and,especially decompression area might need this
DANGER_x is an hint that kicks in when the AI is engaged and it's informing the AI to take it easy in that section if engaged.. it's used very rarely
MAXSPEED_x for limiting the maximum speed in km.
You can use DRS zone app or AI app to define the different start/end effects
eg:
[HINT_0]
START=0.716
END=0.738
VALUE=1.2
[BRAKEHINT_0]
START=0.015
END=0.027
VALUE=0.92
[DANGER_0]
START=0.295
END=0.35
LEFT=1
RIGHT=0
[MAXSPEED_0]
START=0.223
END=0.225
VALUE=250