I'm using the following setup for FGT Championship and won with ease. This settings should work on both A-Spec and B-Spec.
Race 1
Front Downforce - 70
Rear Downforce - 90
Front Breaks - 4
Rear Breaks - 1
Front Ride Height - 5
Rear Ride Height - 5
Transmission/ Top Speed - 261MPH
Spring Rate Front - 17.5
Spring Rate Rear - 17.5
Extension Dampers Front - 8
Extension Dampers Rear - 8
Compression Dampers Front - 6
Compression Dampers Rear - 6
Race 2
Front Downforce - 70
Rear Downforce - 90
Front Breaks - 4
Rear Breaks - 1
Front Ride Height - 5
Rear Ride Height - 5
Transmission/ Top Speed - 249MPH
Spring Rate Front - 17.5
Spring Rate Rear - 17.5
Extension Dampers Front - 8
Extension Dampers Rear - 8
Compression Dampers Front - 6
Compression Dampers Rear - 6
Race 3
Front Downforce - 70
Rear Downforce - 90
Front Breaks - 7
Rear Breaks - 2
Front Ride Height - -10
Rear Ride Height - -10
Transmission/ Top Speed - 199MPH
Spring Rate Front - 18.5
Spring Rate Rear - 18.5
Extension Dampers Front - 8
Extension Dampers Rear - 8
Compression Dampers Front - 6
Compression Dampers Rear - 6
Race 4
Front Downforce - 70
Rear Downforce - 90
Front Breaks - 7
Rear Breaks - 2
Front Ride Height - -10
Rear Ride Height - -10
Transmission/ Top Speed - 236MPH
Spring Rate Front - 18.5
Spring Rate Rear - 18.5
Extension Dampers Front - 8
Extension Dampers Rear - 8
Compression Dampers Front - 6
Compression Dampers Rear - 6
Race 5
Front Downforce - 70
Rear Downforce - 90
Front Breaks - 3
Rear Breaks - 1
Front Ride Height - -10
Rear Ride Height - -10
Transmission/ Top Speed - 249MPH
Spring Rate Front - 18.5
Spring Rate Rear - 18.5
Extension Dampers Front - 8
Extension Dampers Rear - 8
Compression Dampers Front - 6
Compression Dampers Rear - 6
Race 6
Front Downforce - 70
Rear Downforce - 90
Front Breaks - 3
Rear Breaks - 1
Front Ride Height - -10
Rear Ride Height - -10
Transmission/ Top Speed - 249MPH
Spring Rate Front - 18.5
Spring Rate Rear - 18.5
Extension Dampers Front - 8
Extension Dampers Rear - 8
Compression Dampers Front - 6
Compression Dampers Rear - 6
I use the same setup
just change speed limit ( depends on the track ):y: