Install overhead cameras on more turns. Install gib cameras on more turns. These are used at some CART road course events. They are cameras mounted on long arms that can move up and down through 45 feet and traverse a 300 degree arc. Also, the audio coming from the cameras to the viewer much be better.
Champ cars sound great.
Watch a F1 broadcast and listen. Do double camera coverage on key turns 6. Develop or buy transponder cameras for close tracking of cars, i.e. the camera would lock onto the car's transponder and follow it automatically. This would be remote controlled. It also permits a quick move from one car to another.