| 1998 · 1998 24 Hours of Le Mans | DNF | 62 | LM-GT2 | CJ Motorsports (private entrant) | John Morton · Harald Grohs · John GrahamJohn Morton Harald Grohs John Graham | Porsche 911 GT2 | Porsche M64/82 3.6L F6 twin turbo | 164 | Wikipedia contributors · CC BY-SA 4.0 |
| 1993 · 1993 24 Hours of Le Mans | DNF | 48 | Category 4 | Team Paduwa | Harald Grohs · Didier TheysHarald Grohs Didier Theys Jean-Paul Libert | Porsche 911 Carrera 2 Cup | Porsche M64 3.6L F6 | 8 | Wikipedia contributors · CC BY-SA 4.0 |
| 1990 · 1990 24 Hours of Le Mans | DNF | 26 | Gr.C1 | Obermaier Racing Primagaz Compétition | Harald Grohs · Marc DuezHarald Grohs Marc Duez Jürgen Oppermann | Porsche 962C | Porsche 935/82 3.0L F6 twin turbo | 140 | Wikipedia contributors · CC BY-SA 4.0 |
| 1990 · FIA WSPC - Fuji Film Cup, Suzuka Circuit | retired | 26 | 2 | Obermaier Primagaz | Harald Grohs · DNS - Jürgen Oppermann | Porsche 962C | — | 39 | WSPR historical record |
| 1990 · FIA WSPC - Trofeo Caracciolo, Monza | 15 | 26 | | Obermaier Racing | Harald Grohs · Jürgen Oppermann | Porsche 962C | — | 77 | WSPR historical record |
| 1990 · FIA WSPC - British Empire Trophy, Silverstone | 10 | 26 | | Obermaier Racing | Harald Grohs · Jürgen Oppermann | Porsche 962C | — | 96 | WSPR historical record |
| 1990 · FIA WSPC - Coupes de Spa, Spa Francorchamps | retired | 26 | | Obermaier Racing | Harald Grohs · Jürgen Oppermann | Porsche 962C | — | 17 | WSPR historical record |
| 1990 · FIA WSPC, Dijon-Prenios | 17 | 27 | | Obermaier Racing | Otto Altenbach · Harald Grohs · DNS - Pierre Yver | Porsche 962C | — | 117 | WSPR historical record |
| 1990 · FIA WSPC - ADAC Sportwagen WM, Nürburgring | 17 | 26 | | Obermaier Racing | Harald Grohs · Jürgen Oppermann | Porsche 962C | — | 98 | WSPR historical record |
| 1990 · FIA WSPC - Shell Donington Trophy | 13 | 26 | | Obermaier Racing | Harald Grohs · Otto Altenbach | Porsche 962C | — | 113 | WSPR historical record |
| 1990 · FIA WSPC - Shell Donington Trophy | retired | 27 | | Obermaier Racing | Otto Altenbach · Harald Grohs | Porsche 962C | — | 1 | WSPR historical record |
| 1990 · FIA WSPC Mondial Players Ltd., Montreal | 11 | 26 | | Obermaier Racing | Harald Grohs · DNS - Otto Altenbach | Porsche 962C | — | 59 | WSPR historical record |
| 1990 · FIA WSPC - Trofeo Hermanos Rodriguez, Mexico | 9 | 27 | | Obermaier Racing | Otto Altenbach · Harald Grohs | Porsche 962C | — | 103 | WSPR historical record |
| 1990 · FIA WSPC - Trofeo Hermanos Rodriguez, Mexico | did_not_start | 26 | | Obermaier Racing | Harald Grohs · Otto Altenbach | Porsche 962C | — | | WSPR historical record |
| 1989 · 1989 24 Hours of Le Mans | DNF | 5 | Gr.C1 | Repsol Brun Motorsport From A Racing | Harald Grohs · Sarel van der Merwe · Akihiko NakayaHarald Grohs Sarel van der Merwe Akihiko Nakaya | Porsche 962C | Porsche 935/82 3.0L F6 twin turbo | 78 | Wikipedia contributors · CC BY-SA 4.0 |
| 1989 · WSPC Suzuka | 10 | 72 | 0. C1 | Obermaier Primagaz (From A | Harald Grohs · Akihiko Nakaya | Porsche 962C | — | 81 | WSPR historical record |
| 1988 · 1988 24 Hours of Le Mans | 8 | 11 | Gr.C1 | Leyton House Kremer Racing | Kris Nissen · Harald Grohs · George FouchéKris Nissen Harald Grohs George Fouché | Porsche 962C | Porsche 935/82 3.0L F6 twin turbo | 371 | Wikipedia contributors · CC BY-SA 4.0 |
| 1988 · Fuji 1000 Kilometres, Fuji Speedway | retired | 7 | C1 | Joest Racing | Bob Wollek · Harald Grohs | Porsche 962C | — | 191 | WSPR historical record |
| 1988 · Autosport 1000 Kilometres, Silverstone | retired | 10 | C1 | Porsche Kremer Racing | Kris Nissen · Harald Grohs | Porsche 962C | — | 72 | WSPR historical record |
| 1987 · Mount Fuji 1000 Kilometres | retired | 7 | C1 | Joest Racing | Bob Wollek · Harald Grohs · Frank Jelinski | Porsche 962C | — | 81 | WSPR historical record |
| 1987 · Int. ADAC-1000-km-Rennen, Nürburgring | 8 | 31 | 8. C1 | Dauer Racing | Jochen Dauer · Harald Grohs | Porsche 962C | — | 207 | WSPR historical record |
| 1986 · ADAC Kouros 1000 km Nürburgring | 4 | 9 | 4. C1 | Obermaier Racing | Jürgen Lässig · Fulvio Ballabio · Harald Grohs | Porsche 956 | — | 115 | WSPR historical record |
| 1986 · Mount Fuji 1000 Kilometres, Fuji Speedway | 5 | 8 | 5. C1 | Joest Racing | Kris Nissen · "John Winter" · Harald Grohs | Porsche 956 | — | 223 | WSPR historical record |
| 1985 · 1985 24 Hours of Le Mans | DNF | 152 | Gr.B | Vogelsang Automobile (private entrant) | Harald Grohs · Altfrid HegerHarald Grohs Altfrid Heger Kurt König | BMW M1 | BMW M88 3.5L S6 | 32 | Wikipedia contributors · CC BY-SA 4.0 |
| 1985 · Duschfrish ADAC 1000 Kilometres, Hockenheim | 15 | 152 | B | — | Harald Grohs · Kurt König | BMW M1 | — | 109 | WSPR historical record |
| 1984 · Trofeo Filippo Caracciolo, Monza | 4 | 19 | C1 | Brun Motorsport/Kremer | Hans-Joachim Stuck · Harald Grohs · Walter Brun | Porsche 956 | — | 167 | WSPR historical record |
| 1984 · ADAC 1000 Kilometres, Nürburgring | retired | 9 | C1 | Schiesser Porsche Brun | Harald Grohs · Hans-Joachim Stuck | Porsche 956 | — | 79 | WSPR historical record |
| 1984 · British Aerospace 1000 Kilometres, Brands Hatch | 5 | 19 | 5. C1 | Brun Motorsport | Stefan Bellof · Harald Grohs | Porsche 956 | — | 224 | WSPR historical record |
| 1984 · Rothmans Spa 1000 Kilometres, Spa | 3 | 9 | 3. C1 | Brun Motorsport | Hans-Joachim Stuck · Harald Grohs · Walter Brun | Porsche 956 | — | 142 | WSPR historical record |
| 1984 · 1000 Kilometres di Imola | 6 | 18 | 6. C1 | Obermaier Racing | Harald Grohs · Hervé Regout · Jürgen Lässig | Porsche 956 | — | 191 | WSPR historical record |
| 1983 · Grand Prix International 1000 Kilometres, Silverstone | 4 | 18 | 4. C | Obermaier Racing | Axel Plankenhorn · Jürgen Lässig · Harald Grohs | Porsche 956 | — | 201 | WSPR historical record |
| 1983 · Bitburger Pils ADAC 1000 Kilometres, Nürburgring | retired | 101 | B | Angelo Pallavicini | Harald Grohs · Leopold von Bayern | BMW M1 | — | 14 | WSPR historical record |
| 1983 · Trophee Diners Club 1000 Kilometres, Spa-Francorchamps | 4 | 33 | 4. C | Brun Motorsport | Walter Brun · Hans-Joachim Stuck · Harald Grohs | Porsche 956 | — | 138 | WSPR historical record |
| 1983 · Castrol 1000 km Kyalami | retired | 35 | C | Brun Motorsport | Hans-Joachim Stuck · Massimo Sigala · Harald Grohs · Umberto Grano | Porsche 956 | — | 48 | WSPR historical record |
| 1982 · 1982 24 Hours of Le Mans | DNQ | 63 | Gr.5 SP | Vegla Racing Team | Harald Grohs · Mauricio de NarváezDieter Schornstein Harald Grohs Mauricio de Narváez | Porsche 935J | Porsche 930 2.8L F6 twin-turbo | | Wikipedia contributors · CC BY-SA 4.0 |
| 1982 · The Pace Petroleum 6 Hours, Silverstone | 12 | 63 | 3. Gr.5 | Vegla Racing Team | Harald Grohs · Dieter Schornstein | Porsche 935J | — | 209 | WSPR historical record |
| 1982 · The Pace Petroleum 6 Hours, Silverstone | entry_only | 41 | C | URD Team | Rolf Stommelen · Dieter Quester · Jürgen Hamelmann · Harald Grohs | URD C81 BMW | — | | WSPR historical record |
| 1982 · Rudolf Caracciola Wanderpreis 1000 Kilometres, Nürburgring | entry_only | - | Gr.5 | Kremer Racing | Harald Grohs · Rolf Stommelen · Vern Schuppan | Porsche 935/80 | — | | WSPR historical record |
| 1982 · Rudolf Caracciola Wanderpreis 1000 Kilometres, Nürburgring | retired | 36 | Gr.5 | Claude Haldi | Claude Haldi · Bernard Béguin · Harald Grohs | Porsche 935 K3 | — | 12 | WSPR historical record |
| 1982 · Rudolf Caracciola Wanderpreis 1000 Kilometres, Nürburgring | retired | 22 | C | Jürgen Kannacher | Harald Grohs · Jürgen Hamelmann · Helmut Gall | URD C81 BMW | — | 0 | WSPR historical record |
| 1982 · Trophee Diners Club 1000 kilometres, Spa-Francorchamps | retired | 30 | C | URD | Harald Grohs · Willi Siller · Pierre Dieudonné | URD C81 BMW | — | 98 | WSPR historical record |
| 1982 · Shell Oils 1000 Kilometres, Brands Hatch | 13 | 5 | 9. C | URD | Harald Grohs · Helmut Gall | URD C81 BMW | — | 184 | WSPR historical record |
| 1981 · 1981 24 Hours of Le Mans | 10 | 60 | Gr.5 SP +2.0 | Vegla Racing Team | Harald GrohsDieter Schornstein Harald Grohs Götz von Tschirnhaus | Porsche 935J | Porsche 930 3.0L F6 twin-turbo | 321 | Wikipedia contributors · CC BY-SA 4.0 |
| 1981 · 20th Annual 24 Hour Pepsi Challenge Camel GT race, Daytona Internati onal Speedway | 24 | 51 | 9. GTX | Andial Meister Racing | Rolf Stommelen · Howard Meister · Harald Grohs | Porsche 935 K3 | — | 500 | WSPR historical record |
| 1981 · Molson 1000 Camel GT, Mosport | 1 | 3 | 1. GTX | Andial Meister Racing | Rolf Stommelen · Harald Grohs | Porsche 935 K3 | — | 229 | WSPR historical record |
| 1981 · Pabst 500 Camel GT, Road America, Elkhart Lake | 1 | 3 | 1. GTX | Andial Meister Racing | Rolf Stommelen · Harald Grohs | Porsche 935 K3 | — | 125 | WSPR historical record |
| 1981 · Flying Tigers 1000, Brands Hatch | 6 | 29 | 3. Gr.5 | Vegla Racing Team | Harald Grohs · Dieter Schornstein | Porsche 935J | — | 221 | WSPR historical record |
| 1981 · 29th Annual Coca-Cola 12 Hours of Sebring Camel GT race, Sebring Airp ort | 4 | 3 | 4. GTX | Howard Meister | Howard Meister · Rolf Stommelen · Harald Grohs | Porsche 935 K3 | — | 233 | WSPR historical record |
| 1981 · 1000 km Monza | retired | 4 | Gr.5 | Vegla Racing Team | Harald Grohs · Dieter Schornstein | Porsche 935J | — | 67 | WSPR historical record |
| 1981 · Silverstone 6 Hours | 1 | 22 | 1. Gr.5 | Vegla Racing Team | Harald Grohs · Walter Röhrl · Dieter Schornstein | Porsche 935J | — | 206 | WSPR historical record |
| 1981 · 1000 km Nürburgring | 7 | 20 | 4. Gr.5 | Vegla Racing Team | Dieter Schornstein · Harald Grohs · Walter Röhrl | Porsche 935J | — | 16 | WSPR historical record |
| 1980 · 1980 24 Hours of Le Mans | 8 | 49 | Gr.5 SP 2.0+ | Vegla Racing Team | Harald GrohsHarald Grohs Dieter Schornstein Götz von Tschirnhaus | Porsche 935/77A | Porsche 930 3.0L F6 turbo | 314 | Wikipedia contributors · CC BY-SA 4.0 |
| 1980 · Brands Hatch 6 Hours | 7 | 15 | 6. Gr.5 | Sekurit Racing Team | Dieter Schornstein · Harald Grohs | Porsche 935/77 | — | 135 | WSPR historical record |
| 1980 · Monza 1000 Kilometres | 4 | 18 | 3. Gr.5 | Vegla Racing | Dieter Schornstein · Harald Grohs | Porsche 935/77 | — | 180 | WSPR historical record |
| 1980 · Silverstone 1000 | 5 | 16 | 2. Gr.5 | Vegla Racing | Dieter Schornstein · Harald Grohs | Porsche 935/77 | — | 230 | WSPR historical record |
| 1980 · Nürburgring 1000 Kilometres | 7 | 5 | 5. Gr.5 | Vegla Racing | Dieter Schornstein · Harald Grohs | Porsche 935/77 | — | 42 | WSPR historical record |
| 1980 · 6 hours of Watkins Glen | 8 | 13 | 8. Gr.5 | Randolph Townsend | Harald Grohs · Randolph Townsend · DNS - Bruce Jenner | Porsche 935/77 | — | 130 | WSPR historical record |
| 1980 · Molson Canadian 1000 IMSA GT Series, Mosport Park | entry_only | 13 | GTX | Spirit of Nevada | Randolph Townsend · Harald Grohs | Porsche 935 Turbo | — | | WSPR historical record |
| 1979 · 1979 24 Hours of Le Mans | DNF | 37 | Gr.5 SP | Gelo Sportswear International | John Fitzpatrick · Harald Grohs · Jean-Louis LafosseJohn Fitzpatrick Harald Grohs Jean-Louis Lafosse | Porsche 935/77A | Porsche 3.0L F6 turbo | 196 | Wikipedia contributors · CC BY-SA 4.0 |
| 1979 · 25th 1000 km Nürburgring | retired | 22 | Gr.5 | Zakspeed Racing | Harald Ertl · Hans Heyer · Harald Grohs | Lotus Europa | — | | WSPR historical record |
| 1978 · 6 h Mugello | 10 | 32 | 0. Gr.5 | BMW Belgium | Patrick Neve · Harald Grohs | BMW 320i | — | 154 | WSPR historical record |
| 1978 · 6 h Dijon | 13 | 20 | 9. Gr.5 | BMW Belgium | Harald Grohs · Patrick Neve | BMW 320i | — | 143 | WSPR historical record |
| 1978 · 6 h Silverstone | 3 | 53 | 3. Gr.5 | BMW Belgium | Harald Grohs · Eddy Joosen | BMW 320i | — | 220 | WSPR historical record |
| 1978 · 1000 km Nürburgring | 9 | 26 | 9. Gr.5 | BMW Belgium | Harald Grohs · Patrick Neve | BMW 320i | — | 42 | WSPR historical record |
| 1978 · Misano 6 Hours | 4 | 2 | 4. Gr.5 | BMW Belgium | Patrick Neve · Harald Grohs | BMW 320i | — | 255 | WSPR historical record |
| 1978 · Watkins Glen 6 Hours/Trans-Am Championship, Watkins Glen Grand Prix C ircuit | 31 | 20 | 3. Gr.5 | BMW Faltz Essen | Harald Grohs · Markus Höttinger | BMW 320i | — | 76 | WSPR historical record |
| 1978 · 6 h Vallelunga | retired | 31 | Gr.5 | BMW Belguim | Harald Grohs · Eddy Joosen | BMW 320i | — | 193 | WSPR historical record |
| 1977 · ADAC 1000 km Nürburgring | retired | 27T | Gr.5 | BMW Faltz | Harald Grohs · Hans-Joachim Stuck | BMW 320i | — | 13 | WSPR historical record |
| 1977 · ADAC 1000 km Nürburgring | source_section_running_in_practice | 27 | Gr.5 | BMW Faltz | Harald Grohs · Hans-Joachim Stuck | BMW 320i | — | | WSPR historical record |
| 1977 · Hessen Preis, Hockenheim | retired | 42 | Gr.5 | BMW Faltz | Harald Grohs · Manfred Winkelhock | BMW 320i | — | 150 | WSPR historical record |
| 1976 · 1976 24 Hours of Le Mans | 10 | 42 | Gp.5 SP | BMW Motorsport GmbH Alpina-Faltz | Harald Grohs · Sam PoseyHarald Grohs Sam Posey Baron Hughes de Fierlandt | BMW 3.0 CSL | BMW 3.5L S6 | 299 | Wikipedia contributors · CC BY-SA 4.0 |
| 1976 · March Trophy, Mugello 6 Hours | 10 | 3 | 7. Gr.5 | BMW Faltz Alpina Essen | Sam Posey · Harald Grohs · DNS - Hughes de Fierlant | BMW 3.5 CSL | — | 147 | WSPR historical record |
| 1976 · Trofeo Ignazio Giunti, Vallelunga 6 Hours | 2 | 5 | 2. Gr.5 | Faltz Alpina | Harald Grohs · Sam Posey · Hughes de Fierlant | BMW 3.5 CSL | — | 254 | WSPR historical record |
| 1976 · World Championship of Maker, 6 Hours of Silverstone | 4 | 3 | 4. Gr.5 | Alpina Faltz | Harald Grohs · Hughes de Fierlant | BMW 3.5 CSL | — | 214 | WSPR historical record |
| 1976 · ADAC 1000 Kilometres, Nürburgring | retired | 9 | Gr.5 | Faltz Alpina | Harald Grohs · Alain Peltier · Hughes de Fierlant | BMW 3.5 CSL | — | 27 | WSPR historical record |
| 1976 · Martha 1000, Zeltweg 6 Hours, Österreichring | retired | 15 | Gr.5 | Alpina BMW | Ronnie Peterson · Harald Grohs · Hughes de Fierlant | BMW 3.5 CSL | — | 58 | WSPR historical record |
| 1976 · ACF 6 Hours Dijon | 9 | 23 | 8. Gr.5 | Alpina Faltz | Harald Grohs · Gunnar Nilsson · Alain Peltier | BMW 3.5 CSL | — | 287 | WSPR historical record |
| 1975 · 1000 km Nürburgring | did_not_start | 82 | T+2.0 | BMW Faltz Alpina Essen | Harald Grohs · Peter Hennige | BMW 3.0 CSL | — | | WSPR historical record |