PORSCHE RACING HISTORYTom Alan Marx (USA)
1981
26 April 1981 - Riverside 6 Hours - World Championship for Drivers and Makes
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 31 | Porsche 911 Carrera RSR | 911 460 9048 | GTO | Tom Alan Marx (USA)/Dennis Lanfre (USA)/Bill Follmer (USA) | RSR Associates (USA) | 30th | 12th | 59th | 129 laps |
3 May 1981 - Laguna Seca 100 Miles - IMSA - International Motor Sport Association
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 31 | Porsche 911 Carrera RSR | 911 460 9048 | GTO | Tom Alan Marx (USA) | Tom Alan Marx (USA) | 22nd | 7th | 32nd | 47 laps |
26 July 1981 - Sears Point 100 Miles - IMSA - International Motor Sport Association
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 31 | Porsche 911 Carrera RSR | 911 460 9048 | GTO | Tom Alan Marx (USA) | RSR Associates (USA) | 25th | 11th | 19th | 3 laps - Accident |