| 6.2.1983 | 24 h Daytona | 44 | XJR-5 | Tullius / Adam / Bedard | Group 44 | 50th |
| 27.2.1983 | GP of Miami | 44 | XJR-5 | Tullius | Group 44 | 5th |
| 19.3.1983 | 12 h Sebring | 44 | XJR-5 | Tullius / Adam | Group 44 | 58th |
| 20.3.1983 | 500 km Monza | 15 | XJS | Dieudonné / Calderari | TWR Jaguar Racing with Motul | DNF |
| 20.3.1983 | 500 km Monza | 16 | XJS | Nicholson / Walkinshaw | TWR Jaguar Racing with Motul | 2nd |
| 10.4.1983 | 500 km Vallelunga | 14 | XJS | Nicholson / Dieudonné / Walkinshaw | TWR Jaguar Racing with Motul | 3rd |
| 10.4.1983 | 500 km Vallelunga | 15 | XJS | Calderari / Walkinshaw | TWR Jaguar Racing with Motul | DNF |
| 10.4.1983 | 500 km Road Atlanta | 44 | XJR-5 | Tullius / Adam | Group 44 | 1st |
| 24.4.1983 | 6 h Riverside | 44 | XJR-5 | Tullius / Adam | Group 44 | 38th |
| 1.5.1983 | 500 km Donington | 6 | XJS | Nicholson / Walkinshaw | TWR Jaguar Racing with Motul | 5th |
| 1.5.1983 | 500 km Donington | 7 | XJS | Brundle / Calderari / Fitzpatrick | TWR Jaguar Racing with Motul | 1st |
| 1.5.1983 | 100 mile Laguna Seca | 44 | XJR-5 | Bob Tullius | Group 44 | 2nd |
| 15.5.1983 | 500 km Pergusa | 7 | XJS | Nicholson / Walkinshaw | TWR Jaguar Racing with Motul | 1st |
| 15.5.1983 | 500 km Charlotte | 44 | XJR-5 | Tullius / Adam | Group 44 | 3rd |
| 15.5.1983 | 500 km Pergusa | | XJS | Dieudonné / Calderari | TWR Jaguar Racing with Motul | DNF |
| 22.5.1983 | 500 km Mugello | 15 | XJS | Walkinshaw / Fitzpatrick | TWR Jaguar Racing with Motul | 3rd |
| 22.5.1983 | 500 km Mugello | | XJS | Nicholson / Calderari | TWR Jaguar Racing with Motul | DNF |
| 30.5.1983 | 3 h Lime Rock | 44 | XJR-5 | Tullius / Adam | Group 44 | 1st |
| 12.6.1983 | GP Brno | 2 | XJS | Nicholson / Walkinshaw | TWR Jaguar Racing with Motul | 1st |
| 12.6.1983 | GP Brno | 3 | XJS | Dieudonné / Calderari | TWR Jaguar Racing with Motul | 6th |
| 19.6.1983 | 6 h Mid-Ohio | 44 | XJR-5 | Tullius / Adam | Group 44 | 31st |
| 26.6.1983 | 500 km Zeltweg | 7 | XJS | Brundle / Walkinshaw | TWR Jaguar Racing with Motul | 1st |
| 26.6.1983 | 500 km Zeltweg | 8 | XJS | Dieudonné / Calderari | TWR Jaguar Racing with Motul | 2nd |
| 10.7.1983 | GP Nürburgring | 6 | XJS | Nicholson / Walkinshaw | TWR Jaguar Racing with Motul | DNF |
| 10.7.1983 | GP Nürburgring | 7 | XJS | Dieudonné / Calderari / Walkinshaw | TWR Jaguar Racing with Motul | DNF |
| 10.7.1983 | Australian GT Adelaide | 18 | XJS | Mark Trenoweth | Mark Trenowth | DNA |
| 10.7.1983 | 500 km Brainerd | 44 | XJR-5 | Bob Tullius | Group 44 | 22nd |
| 17.7.1983 | 500 km Salzburgring | 6 | XJS | Nicholson / Walkinshaw | TWR Jaguar Racing with Motul | 1st |
| 24.7.1983 | 3 h Sears Point | 44 | XJR-5 | Tullius / Adam | Group 44 | 15th |
| 31.7.1983 | 24 h Spa | 6 | XJS | Dieudonné / Walkinshaw | TWR Jaguar Racing with Motul | DNF |
| 31.7.1983 | 24 h Spa | 7 | XJS | Brundle / Calderari / Percy | TWR Jaguar Racing with Motul | DNF |
| 31.7.1983 | 3 h Portland | 44 | XJR-5 | Tullius / Adam | Group 44 | 24th |
| 14.8.1983 | 6 h Mosport | 44 | XJR-5 | Tullius / Adam | Group 44 Inc. | 1st |
| 28.8.1983 | Australian GT Surfers Paradise | 18 | XJS | Mark Trenoweth | Mark Trenoweth | 4th |
| 11.9.1983 | Tourist Trophy | 6 | XJS | Nicholson / Walkinshaw | TWR Jaguar Racing with Motul | DNF |
| 11.9.1983 | Tourist Trophy | 7 | XJS | Dieudonné / Calderari / Walkinshaw | TWR Jaguar Racing with Motul | 9th |
| 11.9.1983 | 500 mile Pocono | 44 | XJR-5 | Tullius / Bundy | Group 44 | 1st |
| 25.9.1983 | ETCC Zolder | 6 | XJS | Percy / Brundle / Walkinshaw | TWR Jaguar Racing with Motul | 8th |
| 25.9.1983 | ETCC Zolder | 7 | XJS | Dieudonné / Percy | TWR Jaguar Racing with Motul | DNF |