| 1990 · FIA WSPC - Fuji Film Cup, Suzuka Circuit | 20 | 37 | 2 | Toyota Team Tom's | Johnny Dumfries · Aguri Suzuki | Toyota 90C-V | — | 73 | WSPR historical record |
| 1990 · FIA WSPC - Trofeo Caracciolo, Monza | retired | 37 | | Toyota Team Tom's | Roberto Ravaglia · Johnny Dumfries | Toyota 89C-V | — | 56 | WSPR historical record |
| 1990 · FIA WSPC - Trofeo Caracciolo, Monza | source_section_running_in_practice | 37T | | Toyota Team Tom's | Johnny Dumfries | Toyota 89C-V | — | | WSPR historical record |
| 1990 · FIA WSPC - British Empire Trophy, Silverstone | retired | 37 | | Toyota Team Tom's | Johnny Dumfries · Hitoshi Ogawa | Toyota 89C-V | — | 92 | WSPR historical record |
| 1990 · FIA WSPC - Coupes de Spa, Spa Francorchamps | 18 | 36 | | Toyota Team Tom's | Johnny Dumfries · John Watson | Toyota 89C-V | — | 63 | WSPR historical record |
| 1990 · FIA WSPC, Dijon-Prenios | retired | 36 | | Toyota Team Tom's | Johnny Dumfries · Roberto Ravaglia | Toyota 90C-V | — | 7 | WSPR historical record |
| 1990 · FIA WSPC - ADAC Sportwagen WM, Nürburgring | retired | 36 | | Toyota Team Tom's | Johnny Dumfries · Roberto Ravaglia | Toyota 90C-V | — | 50 | WSPR historical record |
| 1990 · FIA WSPC - Shell Donington Trophy | retired | 36 | | Toyota Team Tom's | Johnny Dumfries · Roberto Ravaglia | Toyota 90C-V | — | 99 | WSPR historical record |
| 1990 · FIA WSPC Mondial Players Ltd., Montreal | 14 | 36 | | Toyota Team Tom's | Johnny Dumfries · Roberto Ravaglia | Toyota 90C-V | — | 58 | WSPR historical record |
| 1990 · FIA WSPC - Trofeo Hermanos Rodriguez, Mexico | retired | 36 | | Toyota Team Tom's | Johnny Dumfries · Roberto Ravaglia | Toyota 90C-V | — | 70 | WSPR historical record |
| 1989 · WSPC Suzuka | 20 | 37 | 9. C1 | Toyota Team Tom's | Geoff Lees · Johnny Dumfries | Toyota 89C-V | — | 74 | WSPR historical record |
| 1989 · Coupe de Dijon, Dijon-Prenios | 4 | 37 | 4. C1 | Toyota Team Tom's | Johnny Dumfries · Geoff Lees | Toyota 88C | — | 126 | WSPR historical record |
| 1989 · II Trofeo Repsol, Jarama | 10 | 37 | C1 | Toyota Team Tom's | Johnny Dumfries · DNS - Geoff Lees | Toyota 89C-V | — | 139 | WSPR historical record |
| 1989 · II Trofeo Repsol, Jarama | source_section_running_in_practice | 37T | C1 | Toyota Team Tom's | Johnny Dumfries | Toyota 89C-V | — | | WSPR historical record |
| 1989 · Brands Hatch Trophy | retired | 37 | C1 | Toyota Team Tom's | Johnny Dumfries · John Watson | Toyota 89C-V | — | 109 | WSPR historical record |
| 1989 · Brands Hatch Trophy | source_section_running_in_practice | 37T | | Toyota Team Tom's | Johnny Dumfries | Toyota 88C | — | | WSPR historical record |
| 1989 · Int. ADAC Trophäe, Nürburgring | 7 | 37 | 7. C1 | Toyota Team Tom's | Johnny Dumfries · Geoff Lees | Toyota 89C-V | — | 104 | WSPR historical record |
| 1989 · Wheatcroft Gold Cup, Donington | 10 | 37 | 0. C1 | Toyota Team Tom's | Johnny Dumfries · John Watson | Toyota 89C-V | — | 116 | WSPR historical record |
| 1989 · Coupes de Spa, Spa-Francorchamps | 8 | 37 | 8. C1 | Toyota Team Tom's | Johnny Dumfries · Geoff Lees | Toyota 89C-V | — | 67 | WSPR historical record |
| 1989 · Trofeo Hermanos Rodriguez, Ciudad de Mexico, Mexico | retired | 37 | C1 | Toyota Team Tom's | Johnny Dumfries · John Watson | Toyota 89C-V | — | 66 | WSPR historical record |
| 1988 · 1988 24 Hours of Le Mans | 1 | 2 | Gr.C1 | Silk Cut Jaguar | Jan LAMMERS · Johnny Dumfries · Andy WallaceJan Lammers Johnny Dumfries Andy Wallace | Jaguar XJR-9 LM | Jaguar 7.0L V12 | 394 | Wikipedia contributors · CC BY-SA 4.0 |
| 1988 · 800 km Jerez | retired | 2 | C1 | Silk Cut Jaguar | Jan LAMMERS · Johnny Dumfries | Jaguar XJR-9 | — | 132 | WSPR historical record |
| 1988 · Fuji 1000 Kilometres, Fuji Speedway | retired | 2 | C1 | Silk Cut Jaguar | Jan LAMMERS · Johnny Dumfries · Martin Brundle | Jaguar XJR-9 | — | 35 | WSPR historical record |
| 1988 · 360 km Sandown Park | 4 | 2 | 4. C1 | Silk Cut Jaguar | Jan LAMMERS · Johnny Dumfries | Jaguar XJR-9 | — | 92 | WSPR historical record |
| 1988 · 360 km Jarama | retired | 2 | C1 | Silk Cut Jaguar | Jan LAMMERS · Johnny Dumfries | Jaguar XJR-9 | — | 96 | WSPR historical record |
| 1988 · 1000 km Monza | retired | 2 | C1 | Silk Cut Jaguar | Jan LAMMERS · Johnny Dumfries | Jaguar XJR-9 | — | 114 | WSPR historical record |
| 1988 · Autosport 1000 Kilometres, Silverstone | retired | 2 | C1 | Silk Cut Jaguar | Jan LAMMERS · Johnny Dumfries | Jaguar XJR-9 | — | 204 | WSPR historical record |
| 1988 · Grand Prix ČSSR, Automodrom Brno | 3 | 2 | 3. C1 | Jaguar Silk Cut | Jan LAMMERS · Johnny Dumfries | Jaguar XJR-9 | — | 67 | WSPR historical record |
| 1988 · 1000 km Brands Hatch | retired | 2 | C1 | Silk Cut Jaguar | Jan LAMMERS · Johnny Dumfries | Jaguar XJR-9 | — | 212 | WSPR historical record |
| 1988 · ADAC 1000 km Nürburgring | 8 | 2 | 8. C1 | Silk Cut Jaguar | Jan LAMMERS · Johnny Dumfries | Jaguar XJR-9 | — | 186 | WSPR historical record |
| 1987 · 1987 24 Hours of Le Mans | DNF | 62 | Gr.C1 | Kouros Racing | Johnny Dumfries · Mike Thackwell · Chip GanassiJohnny Dumfries Mike Thackwell Chip Ganassi | Sauber C9 | Mercedes-Benz M117 5.0L V8 twin turbo | 37 | Wikipedia contributors · CC BY-SA 4.0 |
| 1987 · Mount Fuji 1000 Kilometres | 2 | 4 | 2. C1 | Silk Cut Jaguar | Raul Boesel · Johnny Dumfries | Jaguar XJR-8 | — | 224 | WSPR historical record |
| 1987 · Autoglass 1000 Kilometres Silverstone | 8 | 101 | 3. C2 | Ecurie Ecosse | Mike Wilds · Johnny Dumfries | Ecosse C286 Ford | — | 190 | WSPR historical record |
| 1987 · 200 Meilen von Nürnberg - Int. ADAC-Norisring-Trophäe | retired | 31 | | Jochen Dauer Racing | Jochen Dauer · Johnny Dumfries | Porsche 962C | — | 75 | WSPR historical record |
| 1987 · Shell Gemini 1000 Kilometres Brands Hatch | 2 | 15 | 2. C1 | Britten - Lloyd Racing | Mauro Baldi · Johnny Dumfries | Porsche 962C | — | 238 | WSPR historical record |
| 1987 · Int. ADAC-1000-km-Rennen, Nürburgring | retired | 61 | C1 | Kouros Racing Team | Mike Thackwell · Henri Pescarolo · Johnny Dumfries | Sauber C9 Mercedes | — | 138 | WSPR historical record |
| 1987 · Int. ADAC-1000-km-Rennen, Nürburgring | did_not_start | 62 | C1 | Kouros Racing Team | Johnny Dumfries · Manuel Reuter | Sauber C9 Mercedes | — | | WSPR historical record |
| 1987 · Kouros 1000 km Spa | 1 | 6 | 1. C1 | Silk Cut Jaguar | Martin Brundle · Johnny Dumfries · Raul Boesel | Jaguar XJR-8 | — | 142 | WSPR historical record |
| 1985 · Fuji 1000 Kilometres | retired | 14 | C1 | Richard Lloyd Racing with P | Johnny Dumfries · Kenny Acheson | Porsche 956 GTi | — | 9 | WSPR historical record |
| 1984 · Sandown Park 1000 Kilometres | 19 | 56 | C1 | RLR/GTI Engineering | Johnny Dumfries · Jack Brabham · Richard Lloyd | Porsche 956 | — | 108 | WSPR historical record |
| 1984 · Rothmans Spa 1000 Kilometres, Spa | not_classified | 16 | C1 | GTi Engineering | Johnny Dumfries · Richard Lloyd | Porsche 956 | — | | WSPR historical record |