Geoff Brabham (GTP)
Parker Johnstone (Lights)
Pete Halsmer (GTO)
John Fergus (GTU)
Dick Greer (AAC)
Mistrz producentów
Nissan (GTP)
Acura (Lights)
Mazda (GTO)
Nissan (GTU)
| Runda | Tor | Data | Klasa | Kierowca | Pojazd | Zespół |
|---|---|---|---|---|---|---|
| 1 | Daytona Daytona 24 godziny | 1991.02.02 - 02.03 | GTP | Porsche 962C |  Joest Racing | |
| 2 | West Palm Beach | 1991.03.02 | GTO | Mazda RX-7 | Mazda Motorsports | |
| 3 | West Palm Beach | 1991.03.03 | GTP | Jaguar XJR-10 |  Bud Light Jaguar | |
| 4 | West Palm Beach | 1991.03.03 | AAC | Chevrolet Camaro | Currin Racing | |
| 5 | Sebring Sebring 12 godzin | 1991.03.16 | GTP | Nissan NPT-90 | Nissan Performance | |
| 6 | Miami | 1991.04.06 | GTO | Mazda RX-7 | Mazda Motorsports | |
| 7 | Miami | 1991.04.07 | GTP | Jaguar XJR-10 | Bud Light Jaguar | |
| 8 | Long Beach | 1991.04.13 | GTO | Nissan 300ZX | Cunningham Racing | |
| 9 | Road Atlanta | 1991.04.28 | GTP | Jaguar XJR-16 | Bud Light Jaguar | |
| 10 | Heartland Park | 1991.05.05 | GTP | Nissan NPT-91 | Nissan Performance | |
| 11 |  Mosport Park | 1991.05.20 | GTO | Mazda RX-7 | Mazda Motorsports | |
| 12 | Lime Rock Park | 1991.05.26 | GTP | Nissan NPT-91 | Nissan Performance | |
| 13 | Mid-Ohio | 1991.06.01 | GTO | Nissan 300ZX | Cunningham Racing | |
| 14 | Mid-Ohio | 1991.06.02 | GTP | Jaguar XJR-16 | Bud Light Jaguar | |
| 15 | New Orleans | 1991.06.15 | GTO | Mazda RX-7 | Mazda Motorsports | |
| 16 | New Orleans | 1991.06.16 | GTP | Intrepid RM-1 - Chevrolet | MTI Racing | |
| 17 | Watkins Glen | 1991.06.30 | GTP | Eagle HF90 - Toyota | All American Racers | |
| 18 | Laguna Seca | 1991.07.20 | GTO | Mazda RX-7 | Mazda Motorsports | |
| 19 | Laguna Seca | 1991.07.21 | GTP | Jaguar XJR-16 | Bud Light Jaguar | |
| 20 | Portland | 1991.07.28 | GTP | Eagle Mk III - Toyota | All American Racers | |
| 21 | Portland | 1991.07.28 | GTO | Ford Mustang | Roush Racing | |
| 22 | Road America | 1991.08.25 | GTP | Jaguar XJR-16 | Bud Light Jaguar | |
| 23 | Road America | 1991.08.25 | GTO | Nissan 300ZX | Cunningham Racing | |
| 24 | Road Atlanta | 1991.09.01 | GTO | Ford Mustang | Roush Racing | |
| 25 | Watkins Glen | 1991.09.22 | GTO | Nissan 300ZX | Cunningham Racing | |
| 26 | Lime Rock Park | 1991.09.28 | GTO | Nissan 300ZX | Cunningham Racing | |
| 27 | Del Mar | 1991.10.12 | GTO | Ford Mustang | Roush Racing | |
| 28 | Del Mar | 1991.10.13 | GTP | Eagle Mk III - Toyota | All American Racers |
