PORSCHE RACING HISTORYRoger Dorchy (F)
1975
6 April 1975 - Dijon 800 Km - World Championship for Makes
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 29 | Porsche 911 Carrera RSR | 911 460 9058 | GT | Claude Haldi (CH)/Jean-Claude Bering (CH)/Roger Dorchy (F) | Porsche Club Romand (CH) | DNF | 18th | 156 laps - Valve Spring |
6 April 1975 - Dijon 800 Km - World Championship for Makes
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 28 | Porsche 911 Carrera RSR | 911 460 9052 | GT | William Vollery (CH)/Roger Dorchy (F) | William Vollery | DNQ |
1 June 1975 - Nürburgring 1000 Km - World Championship for Makes
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 61 | Porsche 911 Carrera RSR | 911 460 9052 | GT+1.6 | Peter Zbinden (CH)/Roger Dorchy (F) | Porsche-Club-Romand (CH) | 21st | 9th | 51st | 37 laps |
15 June 1975 - Le Mans 24 Hours - Non Championship Race
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 52 | Porsche 911 Carrera RSR | 911 360 0960 | GTS | William Vollery (CH)/Roger Dorchy (F)/Eric Chapuis (CH) | Écurie du Nord (F) | DNF | 29th | 93 laps - Valves |