Al Holbert (GTP)
Wayne Baker (GTO)
Roger Mandeville (GTU)
Mistrz producentów
Porsche (GTP)
Porsche (GTO)
Mazda (GTU)
| Runda | Tor | Data | Klasa | Kierowca | Pojazd | Zespół |
|---|---|---|---|---|---|---|
| 1 | Daytona Daytona 24 godziny | 1983.01.05 - 01.06 | GTP | Porsche 935 K Turbo | Henn's Swap Shop | |
| GTO | Mazda RX-7 | Racing Beat | ||||
| GTU | Mazda RX-7 | Kent Racing | ||||
| 2 | Miami | 1983.02.27 | GTU | Mazda RX-7 | Mandeville Auto Tech | |
| 3 | Miami | 1983.02.27 | GTP | March 83G - Chevrolet | Holbert Racing | |
| 4 | Miami | 1983.02.27 | GTO | Chevrolet Camaro | Stratagraph | |
| 5 | Sebring Sebring 12 godzin | 1983.03.19 | GTP | Porsche 935 K3 Turbo | Bob Akin Motor Racing | |
| GTO | Porsche 934 | Personalized Autohaus | ||||
| GTU | Mazda RX-7 | Mike Meyer Racing | ||||
| 6 | Road Atlanta | 1983.04.10 | GTP | Jaguar XJR-5 | Group 44 | |
| GTO | Porsche 934 | Personalized Autohaus | ||||
| GTU | Datsun ZX | Alderman Datsun | ||||
| 7 | Riverside | 1983.04.24 | GTP | Porsche 935 Turbo |  John Fitzpatrick Racing | |
| GTO | Porsche 934 | Personalized Autohaus | ||||
| GTU | Toyota Celica | All American Racers | ||||
| 8 | Laguna Seca | 1983.05.01 | GTU | BMW 320i | Boy Hayje | |
| 9 | Laguna Seca | 1983.05.01 | GTP | March 83G - Chevrolet | Holbert Racing | |
| GTO | BMW M1 |  B de T Racing | ||||
| 10 | Charlotte | 1983.05.15 | GTP | March 83G - Porsche | Holbert Racing | |
| GTO | Porsche 934 | Personalized Autohaus | ||||
| GTU | Toyota Celica | All American Racers | ||||
| 11 | Lime Rock Park | 1983.05.30 | GTP | Jaguar XJR-5 | Group 44 | |
| GTO | BMW M1 | B de T Racing | ||||
| GTU | Datsun 280ZX | Leitzinger Racing | ||||
| 12 | Mid-Ohio | 1983.06.19 | GTP | March 83G - Chevrolet | Holbert Racing | |
| GTO | Chevrolet Camaro | Stratagraph | ||||
| GTU | Mazda RX-7 | Western Airlines | ||||
| 13 | Daytona | 1983.07.04 | GTP | Porsche 935 Turbo | Henn's Swap Shop | |
| GTO | Chevrolet Camaro | Stratagraph | ||||
| GTU | Mazda RX-7 | RPG 500 Racing | ||||
| 14 | Brainerd | 1983.07.10 | GTP | March 83G - Porsche | Holbert Racing | |
| GTO | Datsun 280ZX Turbo | Electramotive | ||||
| GTU | Mazda RX-7 | Mandeville Auto Tech | ||||
| 15 | Sears Point | 1983.07.24 | GTP | March 83G - Porsche | Holbert Racing | |
| GTO | Datsun 280ZX Turbo | Electramotive | ||||
| GTU | Mazda RX-7 | Trinity Racing | ||||
| 16 | Portland | 1983.07.31 | GTP | March 83G - Porsche | Holbert Racing | |
| GTO | Datsun 280ZX Turbo | Electramotive | ||||
| GTU | Mazda RX-7 | Mandeville Auto Tech | ||||
| 17 |  Mosport Park | 1983.08.14 | GTP | Jaguar XJR-5 | Group 44 | |
| GTO | Mazda RX-7 |  | ||||
| GTU | Mazda RX-7 | Mandeville Auto Tech | ||||
| 18 | Road America | 1983.08.21 | GTP | Ford Mustang GTP | Team Zakspeed USA | |
| GTO | Datsun 280ZX Turbo | Electramotive | ||||
| GTU | Mazda RX-7 | Mandeville Auto Tech | ||||
| 19 | Pocono | 1983.09.11 | GTP | Jaguar XJR-5 | Group 44 | |
| GTO | Chevrolet Camaro | Stratagraph | ||||
| GTU | Mazda RX-7 | RGP 500 Racing | ||||
| 20 | Daytona | 1983.11.27 | GTP | March 83G - Porsche | Holbert Racing | |
| GTO | BMW M1 | Fomfor | ||||
| GTU | Porsche 924 Carrera | |
