PORSCHE RACING HISTORYHarald Grohs (D)
1988 : Fuji 500 km - 2nd overall : Suzuka 500 km - 3rd overall
3 March 1988 - Fuji 500 km - All Japan Sports Prototype Championship
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 16 | Porsche 962 CK6 | 962-CK6 | LD-1 | Kris Nissen (DK)/Harald Grohs (D) | Leyton House Racing Team (D) | 2nd | 2nd | 7th | 112 laps |
10 April 1988 - Suzuka 500 km - All Japan Sports Prototype Championship
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 16 | Porsche 962 CK6 | 962-CK6 | C | Kris Nissen (DK)/Harald Grohs (D) | Leyton House Racing Team (D) | 3rd | 3rd | 6th | 86 laps |
9 October 1988 - Fuji 1000 km - World Sports-Prototype Championship
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 7 | Porsche 962 C | 962C-007 | C1 | Bob Wollek (F)/Harald Grohs (D) | Joest Racing (D) | DNF | 18th | 191 laps - Engine |