PORSCHE RACING HISTORYChassis No. 550-0031
12 June 1955 - Le Mans 24 Hours - World Sports Car Championship
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 38 | Porsche 550 Spyder | 550-0031 | S1.5 | Walter Ringgenberg (CH)/Hans-Jörg Gilomen (CH) | Walter Ringgenberg (CH) | DNF | 65 laps - Engine |
27 May 1956 - Nürburgring 1000 km - World Sports Car Championship
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 34 | Porsche 550 Spyder | 550-0031 | S1.5 | Michael May (CH)/Pierre May (D) | Michael May | DNF |