Round | Circuit | Date | Winner | Vehicle * | Entrant |
---|---|---|---|---|---|
1 | Phoenix | 1981.03.22 | Chaparral - Cosworth | Chaparral | |
2 | Milwaukee Mile | 1981.06.07 | Eagle - Chevy | All American Racers | |
3 | Road Atlanta | 1981.06.21 | Penske PC-9B - Cosworth | Penske Racing | |
4 | Penske PC-9B - Cosworth | Penske Racing | |||
5 | Michigan | 1981.07.25 | Penske PC-7 - Cosworth | Alex Foods | |
6 | Riverside | 1981.08.30 | Penske PC-9B - Cosworth | Penske Racing | |
7 | Milwaukee Mile | 1981.09.05 | March - Cosworth | Bignotti-Cotter | |
8 | Detroit | 1981.09.20 | Penske PC-9B - Cosworth | Penske Racing | |
9 | Watkins Glen | 1981.10.04 | Penske PC-9B - Cosworth | Penske Racing | |
10 | Autódromo Hermanos Rodríguez | 1981.10.18 | Penske PC-9B - Cosworth | Penske Racing | |
11 | Phoenix | 1981.10.31 | March - Cosworth | Bignotti-Cotter |