| 2008 · 2008 24 Hours of Le Mans | 12 | 31 | LMP2 | Team Essex | Casper Elgaard · John Nielsen · Sascha MaassenCasper Elgaard John Nielsen Sascha Maassen | Porsche RS Spyder Evo | Porsche MR6 3.4 L V8 | 347 | Wikipedia contributors · CC BY-SA 4.0 |
| 2006 · 2006 24 Hours of Le Mans | 24 | 2 | LMP1 | Zytek Engineering Team Essex Invest | John Nielsen · Casper Elgaard · Philip AndersenJohn Nielsen Casper Elgaard Philip Andersen | Zytek 06S | Zytek ZB408 4.0L V8 | 269 | Wikipedia contributors · CC BY-SA 4.0 |
| 2004 · 2004 24 Hours of Le Mans | 24 | 20 | LMP1 | Lister Racing | John Nielsen · Casper Elgaard · Jens MøllerJohn Nielsen Casper Elgaard Jens Møller | Lister Storm LMP | Chevrolet LS1 6.0L V8 | 279 | Wikipedia contributors · CC BY-SA 4.0 |
| 2003 · 2003 24 Hours of Le Mans | 22 | 26 | LMP675 | RN Motorsport Ltd. | John Nielsen · Hayanari Shimoda · Casper ElgaardJohn Nielsen Hayanari Shimoda Casper Elgaard | DBA4 03S | Zytek ZG348 3.4L V8 | 288 | Wikipedia contributors · CC BY-SA 4.0 |
| 2001 · 2001 24 Hours of Le Mans | DNF | 10 | LMP900 | Team Den Blå Avis - Goh | John Nielsen · Hiroki Katoh · Casper ElgaardJohn Nielsen Hiroki Katoh Casper Elgaard | Dome S101 | Judd GV4 4.0 L V10 | 66 | Wikipedia contributors · CC BY-SA 4.0 |
| 2000 · 2000 24 Hours of Le Mans | NC | 10 | LMP900 | Team Den Blå Avis | John Nielsen · Mauro Baldi · Klaus GrafJohn Nielsen Mauro Baldi Klaus Graf | Panoz LMP-1 Roadster-S | Élan 6L8 6.0 L V8 | 205 | Wikipedia contributors · CC BY-SA 4.0 |
| 1998 · 1998 24 Hours of Le Mans | 5 | 30 | LM-GT1 | NISMO | John Nielsen · Michael Krumm · Franck LagorceJohn Nielsen Michael Krumm Franck Lagorce | Nissan R390 GT1 | Nissan VRH35L 3.5L V8 twin turbo | 342 | Wikipedia contributors · CC BY-SA 4.0 |
| 1997 · 1997 24 Hours of Le Mans | DNS | 40 | LM-GT1 | GTC/Gulf Team Davidoff | Thomas Bscher · John Nielsen · Chris GoodwinThomas Bscher John Nielsen Chris Goodwin | McLaren F1 GTR 97 | BMW S70/3 6.1L V12 | | Wikipedia contributors · CC BY-SA 4.0 |
| 1996 · 1996 24 Hours of Le Mans | 4 | 30 | LM-GT1 | David Price Racing West Competition | Thomas Bscher · John Nielsen · Peter KoxThomas Bscher John Nielsen Peter Kox | McLaren F1 GTR LM | BMW S70/3 6.1L V12 | 338 | Wikipedia contributors · CC BY-SA 4.0 |
| 1995 · 1995 24 Hours of Le Mans | DNF | 49 | LM-GT1 | David Price Racing West Competition | Thomas Bscher · John Nielsen · Jochen MassDr Thomas Bscher John Nielsen Jochen Mass | McLaren F1 GTR | BMW S70/2 6.1L V12 | 131 | Wikipedia contributors · CC BY-SA 4.0 |
| 1994 · 1994 24 Hours of Le Mans | DNF | 58 | LM-GT2 | Seikel Motorsport | Thomas Bscher · Lindsay Owen-Jones · John NielsenThomas Bscher Lindsay Owen-Jones John Nielsen | Porsche 968 RS | Porsche 3.0L S4 turbo | 84 | Wikipedia contributors · CC BY-SA 4.0 |
| 1993 · 1993 24 Hours of Le Mans | DSQ | 50 | Category 4 | TWR Jaguar Racing | John Nielsen · David Brabham · David CoulthardJohn Nielsen David Brabham David Coulthard | Jaguar XJ220 C | Jaguar JRV-6 3.5 L V6 twin turbo | 306 | Wikipedia contributors · CC BY-SA 4.0 |
| 1992 · 1992 24 Hours of Le Mans | 7 | 51 | Category 3 | Porsche Kremer Racing | Manuel Reuter · John Nielsen · Giovanni LavaggiManuel Reuter John Nielsen Giovanni Lavaggi | Porsche 962 C-K6 | Porsche 935 3.0L F6 twin turbo | 334 | Wikipedia contributors · CC BY-SA 4.0 |
| 1991 · 1991 24 Hours of Le Mans | 4 | 33 | Category 2 | Silk Cut Jaguar Team Tom Walkinshaw Racing | Derek Warwick · John Nielsen · Andy WallaceDerek Warwick John Nielsen Andy Wallace | Jaguar XJR-12LM | Jaguar HE 7.4L V12 | 356 | Wikipedia contributors · CC BY-SA 4.0 |
| 1990 · 1990 24 Hours of Le Mans | 1 | 3 | Gr.C1 | Silk Cut Jaguar Team Tom Walkinshaw Racing | John Nielsen · Price Cobb · Martin BrundleJohn Nielsen Price Cobb Martin Brundle | Jaguar XJR-12 LM | Jaguar 7.0L V12 | 359 | Wikipedia contributors · CC BY-SA 4.0 |
| 1989 · 1989 24 Hours of Le Mans | DNF | 2 | Gr.C1 | Silk Cut Jaguar Team Tom Walkinshaw Racing | John Nielsen · Andy Wallace · Price CobbJohn Nielsen Andy Wallace Price Cobb | Jaguar XJR-9LM | Jaguar 7.0L V12 | 215 | Wikipedia contributors · CC BY-SA 4.0 |
| 1989 · WSPC Suzuka | 5 | 2 | 5. C1 | Silk Cut Jaguar | John Nielsen · Andy Wallace | Jaguar XJR-9 | — | 81 | WSPR historical record |
| 1989 · Coupe de Dijon, Dijon-Prenios | retired | 2 | C1 | Silk Cut Jaguar | John Nielsen · Andy Wallace | Jaguar XJR-9 | — | 79 | WSPR historical record |
| 1989 · II Trofeo Repsol, Jarama | 6 | 2 | C1 | Silk Cut Jaguar | John Nielsen · Andy Wallace | Jaguar XJR-9 | — | 142 | WSPR historical record |
| 1989 · Brands Hatch Trophy | retired | 2 | C1 | Silk Cut Jaguar | John Nielsen · Andy Wallace | Jaguar XJR-9 | — | 101 | WSPR historical record |
| 1989 · Int. ADAC Trophäe, Nürburgring | 5 | 2 | 5. C1 | Silk Cut Jaguar | John Nielsen · Andy Wallace | Jaguar XJR-11 | — | 104 | WSPR historical record |
| 1989 · Int. ADAC Trophäe, Nürburgring | source_section_running_in_practice | 2T | | Silk Cut Jaguar | John Nielsen · Andy Wallace | Jaguar XJR-9 | — | | WSPR historical record |
| 1989 · Coupes de Spa, Spa-Francorchamps | retired | 2 | C1 | Silk Cut Jaguar | John Nielsen · Andy Wallace | Jaguar XJR-11 | — | 25 | WSPR historical record |
| 1988 · 1988 24 Hours of Le Mans | DNF | 1 | Gr.C1 | Silk Cut Jaguar | Martin Brundle · John NielsenMartin Brundle John Nielsen | Jaguar XJR-9LM | Jaguar 7.0L V12 | 306 | Wikipedia contributors · CC BY-SA 4.0 |
| 1988 · 800 km Jerez | 2 | 3 | C1 | Silk Cut Jaguar | John Nielsen · John Watson · Andy Wallace | Jaguar XJR-9 | — | 190 | WSPR historical record |
| 1988 · Fuji 1000 Kilometres, Fuji Speedway | 1 | 1 | 1. C1 | Silk Cut Jaguar | Martin Brundle · Eddie Cheever · John Nielsen | Jaguar XJR-9 | — | 224 | WSPR historical record |
| 1988 · 360 km Jarama | 3 | 3 | 3. C1 | Silk Cut Jaguar | John Nielsen · John Watson | Jaguar XJR-8/88 | — | 107 | WSPR historical record |
| 1988 · Autosport 1000 Kilometres, Silverstone | entry_only | - | C1 | Silk Cut Jaguar | John Watson · John Nielsen | Jaguar XJR-9 | — | | WSPR historical record |
| 1988 · Grand Prix ČSSR, Automodrom Brno | 2 | 1 | 2. C1 | Jaguar Silk Cut | Martin Brundle · John Nielsen | Jaguar XJR-9 | — | 67 | WSPR historical record |
| 1988 · 1000 km Brands Hatch | 1 | 1 | 1. C1 | Silk Cut Jaguar | John Nielsen · Andy Wallace · Martin Brundle | Jaguar XJR-9 | — | 240 | WSPR historical record |
| 1987 · 1987 24 Hours of Le Mans | DNF | 6 | Gr.C1 | Silk Cut Jaguar | Martin Brundle · John NielsenMartin Brundle John Nielsen | Jaguar XJR-8LM | Jaguar 7.0L V12 | 231 | Wikipedia contributors · CC BY-SA 4.0 |
| 1987 · Mount Fuji 1000 Kilometres | 9 | 27 | 7. C1 | From A Racing | Hideki Okada · John Nielsen | Porsche 962C | — | 209 | WSPR historical record |
| 1987 · 1000 km Monza | retired | 4 | C1 | Silk Cut Jaguar | Raul Boesel · John Nielsen | Jaguar XJR-8 | — | 167 | WSPR historical record |
| 1987 · Autoglass 1000 Kilometres Silverstone | retired | 6 | C1 | Silk Cut Jaguar | Martin Brundle · John Nielsen | Jaguar XJR-8 LM | — | 156 | WSPR historical record |
| 1987 · Shell Gemini 1000 Kilometres Brands Hatch | 1 | 4 | 1. C1 | Silk Cut Jaguar | Raul Boesel · John Nielsen | Jaguar XJR-8 | — | 238 | WSPR historical record |
| 1987 · Kouros 1000 km Spa | 4 | 4 | 4. C1 | Silk Cut Jaguar | Eddie Cheever · John Nielsen | Jaguar XJR-8 | — | 140 | WSPR historical record |
| 1986 · 1986 24 Hours of Le Mans | DNF | 61 | Gr.C1 | Kouros Racing | John Nielsen · Mike ThackwellJohn Nielsen Mike Thackwell | Sauber C8 | Mercedes-Benz M117 5.0L V8 twin turbo | 61 | Wikipedia contributors · CC BY-SA 4.0 |
| 1986 · Coppa Kouros, Monza | 9 | 61 | 9. C1 | Kouros Racing Team | John Nielsen · Henri Pescarolo | Sauber C8 Mercedes | — | 59 | WSPR historical record |
| 1986 · Kouros' 1000 km Silverstone | 8 | 61 | 8. C1 | Kouros Racing Team | Mike Thackwell · Henri Pescarolo · John Nielsen | Sauber C8 Mercedes | — | 203 | WSPR historical record |
| 1985 · 1985 24 Hours of Le Mans | DNS | 61 | Gr.C1 | Sauber Racing | John Nielsen · Dieter Quester · Max WeltiJohn Nielsen Dieter Quester Max Welti | Sauber C8 | Mercedes-Benz M117 5.0L V8 turbo | | Wikipedia contributors · CC BY-SA 4.0 |
| 1985 · Malaysia 800 Selangor, Shah Alam | 2 | 51 | 2. C1 | TWR Jaguar | Mike Thackwell · John Nielsen · Jan LAMMERS | Jaguar XJR-6 | — | 217 | WSPR historical record |
| 1985 · Fuji 1000 Kilometres | retired | 51 | C1 | TWR Jaguar | Mike Thackwell · John Nielsen | Jaguar XJR-6 | — | 4 | WSPR historical record |
| 1985 · Fuji 1000 Kilometres | entry_only | 61 | C1 | Sauber | John Nielsen · Dieter Quester · Max Welti | Sauber C8 Mercedes | — | | WSPR historical record |
| 1981 · 1000 km Nürburgring | did_not_qualify | 91 | T | Holger Knudsen | Holger Knudsen · John Nielsen | Opel Ascona | — | | WSPR historical record |