PORSCHE RACING HISTORYJiro Yoneyama (J)
1985 : All Japan Fuji 1000 km - 2nd overall
7 April 1985 - Suzuka 500 km - All Japan Endurance Championship
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 27 | Porsche 956 | 956-101 | D | Jiro Yoneyama (J)/Hideki Okada (J) | From A Racing (J) | 7th | 7th | 6th | 80 laps |
5 May 1985 - All Japan Fuji 1000 km - All Japan Endurance Championship
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 27 | Porsche 956 | 956-101 | LD-1 | Jiro Yoneyama (J)/Hideki Okada (J) | From A Racing (J) | 2nd | 2nd | 7th | 221 laps |
28 July 1985 - Fuji 500 Miles - All Japan Endurance Championship
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 27 | Porsche 956 | 956-101 | LD-1 | Jiro Yoneyama (J)/Hideki Okada (J) | From A Racing (J) | 8th | 7th | 9th | 166 laps |
25 August 1985 - Suzuka 1000 km - All Japan Endurance Championship
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 27 | Porsche 956 | 956-101 | D | Jiro Yoneyama (J)/Hideki Okada (J) | From A Racing (J) | 5th | 5th | 8th | 167 laps |
6 October 1985 - Fuji 1000 km - World Endurance Championship
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 27 | Porsche 956 | 956-101 | C1 | Jiro Yoneyama (J)/Hideki Okada (J) | From A Racing (J) | DNF | 12th | 10 laps - Withdrawn due to weather |
24 November 1985 - Fuji 500 km - All Japan Endurance Championship
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 27 | Porsche 956 | 956-101 | LD-1 | Jiro Yoneyama (J)/Hideki Okada (J) | From A Racing (J) | 5th | 5th | 12th | 80 laps |