PORSCHE RACING HISTORYHarald Grohs (D)
1983
8 May 1983 - Silverstone 1000 km - World Endurance Championship
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 18 | Porsche 956 | 956-109 | C | Axel Plankenhorn (D)/Jürgen Lässig (D)/Harald Grohs (D) | Obermaier Racing (D) | 4th | 4th | 8th | 201 laps |
4 September 1983 - Spa 1000 km - World Endurance Championship
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 33 | Porsche 956 | 956-111 | C | Walter Brun (CH)/Hans-Joachim Stuck (D)/Harald Grohs (D) | Brun Motorsport | 4th | 4th | 7th | 138 laps |