The real CART cars run speedway wings at tracks such as Homestead and Twin Ring
Motegi, but a lot of the converted tracks of such places give you road course
wings by default. If you want to change to the correct wing type, open the
trackname.txt file for the desired track, and change the TTYPE value to 3.
This is the "superspeedway" setting, and will give the cars the flat wings, and
raise the yellow-flag speed to 90mph.
Bob