| 1991 · 1991 24 Hours of Le Mans | DNF | 32 | Category 2 | Team Sauber Mercedes | Jonathan Palmer · Stanley Dickens · Kurt ThiimJonathan Palmer Stanley Dickens Kurt Thiim | Mercedes-Benz C11 | Mercedes-Benz M119 5.0L V8 twin turbo | 223 | Wikipedia contributors · CC BY-SA 4.0 |
| 1991 · FIA SWC - Castrol BRDC Empire Trophy, Silverstone | retired | 59 | | Salamin/Team Schuppan | Jonathan Palmer · Eje Elgh | Porsche 962C | — | 33 | WSPR historical record |
| 1990 · 1990 24 Hours of Le Mans | DNS | 8 | Gr.C1 | Joest Porsche Racing | Bob Wollek · Jonathan Palmer · Philippe AlliotBob Wollek Jonathan Palmer Philippe Alliot | Porsche 962C | Porsche 935/82 3.0L F6 twin turbo | | Wikipedia contributors · CC BY-SA 4.0 |
| 1990 · FIA WSPC - Fuji Film Cup, Suzuka Circuit | 11 | 8 | 2 | Joest Porsche Racing | Jonathan Palmer · Henri Pescarolo | Porsche 962C | — | 79 | WSPR historical record |
| 1990 · FIA WSPC - Trofeo Caracciolo, Monza | 8 | 8 | | Joest Porsche Racing | Jonathan Palmer · Tiff Needell | Porsche 962C | — | 81 | WSPR historical record |
| 1990 · FIA WSPC - British Empire Trophy, Silverstone | retired | 8 | | Joest Porsche Racing | Jonathan Palmer · Tiff Needell | Porsche 962C | — | 70 | WSPR historical record |
| 1990 · FIA WSPC - Coupes de Spa, Spa Francorchamps | retired | 8 | | Joest Porsche Racing | Jonathan Palmer · Derek Bell | Porsche 962C | — | 43 | WSPR historical record |
| 1990 · FIA WSPC, Dijon-Prenios | 8 | 8 | | Joest Porsche Racing | Jonathan Palmer · David Hobbs | Porsche 962C | — | 122 | WSPR historical record |
| 1990 · FIA WSPC - ADAC Sportwagen WM, Nürburgring | retired | 8 | | Joest Porsche Racing | Jonathan Palmer · Hans-Joachim Stuck | Porsche 962C | — | 16 | WSPR historical record |
| 1990 · FIA WSPC - Shell Donington Trophy | 10 | 8 | | Joest Porsche Racing | Jonathan Palmer · Michael Bartels | Porsche 962C | — | 115 | WSPR historical record |
| 1990 · FIA WSPC Mondial Players Ltd., Montreal | 8 | 8 | | Joest Porsche Racing | Jonathan Palmer · Hans-Joachim Stuck | Porsche 962C | — | 60 | WSPR historical record |
| 1990 · FIA WSPC - Trofeo Hermanos Rodriguez, Mexico | 5 | 8 | | Joest Porsche Racing | Hans-Joachim Stuck · Jonathan Palmer | Porsche 962C | — | 106 | WSPR historical record |
| 1987 · 1987 24 Hours of Le Mans | DNF | 15 | Gr.C1 | Britten-Lloyd Racing Liqui Moly Equipe | Jonathan Palmer · James Weaver · Price CobbJonathan Palmer James Weaver Price Cobb | Porsche 962C GTi | Porsche 935/79 2.8L F6 twin turbo | 112 | Wikipedia contributors · CC BY-SA 4.0 |
| 1987 · Grand Premio Fortuna, Jarama | 8 | 15 | 8. C1 | Britten - Lloyd Racing | Mauro Baldi · Jonathan Palmer | Porsche 962C | — | 104 | WSPR historical record |
| 1987 · 1000 km Jerez | retired | 15 | C1 | Britten - Lloyd Racing | Jonathan Palmer · Mauro Baldi | Porsche 962C | — | 27 | WSPR historical record |
| 1987 · Autoglass 1000 Kilometres Silverstone | retired | 15 | C1 | Britten - Lloyd Racing | Jonathan Palmer · Mauro Baldi | Porsche 962C | — | 25 | WSPR historical record |
| 1987 · 200 Meilen von Nürnberg - Int. ADAC-Norisring-Trophäe | 1 | 15 | C1 | Britten - Lloyd Racing | Mauro Baldi · Jonathan Palmer | Porsche 962C | — | 154 | WSPR historical record |
| 1987 · Int. ADAC-1000-km-Rennen, Nürburgring | 5 | 15 | 5. C1 | Britten - Lloyd Racing | Mauro Baldi · Jonathan Palmer | Porsche 962C | — | 211 | WSPR historical record |
| 1987 · Kouros 1000 km Spa | retired | 15 | C1 | Britten - Lloyd Racing | Jonathan Palmer · Mauro Baldi | Porsche 962C | — | 103 | WSPR historical record |
| 1985 · 1985 24 Hours of Le Mans | 2 | 14 | Gr.C1 | Canon Racing Richard Lloyd Racing GTi Engineering | Jonathan Palmer · James Weaver · Richard LloydJonathan Palmer James Weaver Richard Lloyd | Porsche 956 GTi | Porsche 935/79 2.6L F6 twin turbo | 371 | Wikipedia contributors · CC BY-SA 4.0 |
| 1985 · Trofeo Filippo Caracciolo, Monza | 5 | 14 | 5. C1 | GTi Engineering | Jonathan Palmer · Jan LAMMERS | Porsche 956 | — | 134 | WSPR historical record |
| 1985 · Silverstone 1000 Kilometres | 5 | 14 | 5. C1 | Richard Lloyd Racing with P | Jonathan Palmer · Jan LAMMERS | Porsche 956 GTi | — | 207 | WSPR historical record |
| 1985 · Duschfrish ADAC 1000 Kilometres, Hockenheim | 5 | 14 | C1 | Richard Lloyd Racing | Jonathan Palmer · David Hobbs | Porsche 956 GTi | — | 143 | WSPR historical record |
| 1985 · 1000 km Spa | source_section_running_in_practice | 14 | C1 | Richard Lloyd Racing | Jonathan Palmer | Porsche 956 GTi | — | | WSPR historical record |
| 1984 · 1984 24 Hours of Le Mans | DNF | 14 | Gr.C1 | Canon Racing Richard Lloyd Racing GTi Engineering | Jonathan Palmer · Jan LAMMERSJonathan Palmer Jan Lammers | Porsche 956 | Porsche 935/79 2.6L F6 twin turbo | 239 | Wikipedia contributors · CC BY-SA 4.0 |
| 1984 · Trofeo Filippo Caracciolo, Monza | 5 | 14 | C1 | GTi Engineering | Jonathan Palmer · Jan LAMMERS | Porsche 956 | — | 159 | WSPR historical record |
| 1984 · Sandown Park 1000 Kilometres | 3 | 14 | C1 | RLR/GTI Engineering | Jonathan Palmer · Jan LAMMERS | Porsche 956 GTi | — | 202 | WSPR historical record |
| 1984 · Grand Prix International 1000 Kilometres, Silverstone | 5 | 14 | 5. C1 | GTi Enginnering | Jonathan Palmer · Jan LAMMERS | Porsche 956 | — | 203 | WSPR historical record |
| 1984 · ADAC 1000 Kilometres, Nürburgring | 4 | 14 | 4. C1 | Canon Racing - GTI Engineer | Jonathan Palmer · Jan LAMMERS · Christian Danner | Porsche 956 | — | 205 | WSPR historical record |
| 1984 · British Aerospace 1000 Kilometres, Brands Hatch | 1 | 14 | 1. C1 | GTi Engineering | Jonathan Palmer · Jan LAMMERS | Porsche 956 | — | 238 | WSPR historical record |
| 1984 · Rothmans Spa 1000 Kilometres, Spa | retired | 14 | C1 | GTi Engineering | Jan LAMMERS · Jonathan Palmer | Porsche 956 | — | 5 | WSPR historical record |
| 1984 · 1000 Kilometres di Imola | 2 | 14 | 2. C1 | GTi Engineering | Jonathan Palmer · Jan LAMMERS | Porsche 956 | — | 199 | WSPR historical record |
| 1984 · Mount Fuji 1000 Kilometres | 9 | 14 | 7. C1 | GTi Engineering | Jonathan Palmer · Jan LAMMERS | Porsche 956 | — | 204 | WSPR historical record |
| 1983 · 1983 24 Hours of Le Mans | 8 | 14 | Gr.C | Canon Racing Richard Lloyd Racing | Richard Lloyd · Jonathan Palmer · Jan LAMMERSRichard Lloyd Jonathan Palmer Jan Lammers | Porsche 956 | Porsche 935/79 2.6L F6 twin turbo | 340 | Wikipedia contributors · CC BY-SA 4.0 |
| 1983 · Bitburger Pils ADAC 1000 Kilometres, Nürburgring | 3 | 14 | 3. C | Richard Lloyd Racing | Keke Rosberg · Jan LAMMERS · Jonathan Palmer | Porsche 956 | — | 43 | WSPR historical record |
| 1983 · Mount Fuji 1000 Kilometres | entry_only | 14 | C | Richard Lloyd Racing | Jan LAMMERS · Jonathan Palmer | Porsche 956 | — | | WSPR historical record |
| 1983 · Castrol 1000 km Kyalami | 5 | 14 | 5. C | Richard Lloyd Racing | Jan LAMMERS · Jonathan Palmer | Porsche 956 | — | 225 | WSPR historical record |
| 1982 · Trofeo Filippo Caracciolo, Monza | retired | 97 | GTX | GTi Engineering | Jonathan Palmer · Richard Lloyd | Porsche 924 Carrera GTR | — | 90 | WSPR historical record |
| 1982 · Trophee Diners Club 1000 kilometres, Spa-Francorchamps | 15 | 84 | 1. IMSA GTO | GTi Engineering | Jonathan Palmer · Richard Lloyd | Porsche 924 Carrera GTR | — | 123 | WSPR historical record |
| 1982 · Shell Oils 1000 Kilometres, Brands Hatch | 4 | 3 | 2. C | Ford Werke AG | Jonathan Palmer · Desiré Wilson | Ford C100 | — | 201 | WSPR historical record |