PORSCHE RACING HISTORYJohn Hulen (USA)
1983
6 February 1983 - Daytona 24 Hours - IMSA - International Motor Sport Association
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 64 | Porsche 911 Carrera RSR | GTO | John Hulen (USA)/Ron Coupland (USA)/Bob Speakman (USA) | John Hulen (USA) | 58th | 28th | 46th | 118 laps - Electrics |
19 June 1983 - Mid-Ohio 6 Hours - IMSA - International Motor Sport Association
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 64 | Porsche 911 Carrera RSR | GTO | John Hulen (USA)/Ron Coupland (USA) | John Hulen (USA) | 36th | 9th | 33rd | 108 laps |
21 August 1983 - Road America 500 Miles - IMSA - International Motor Sport Association
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 64 | Porsche 911 Carrera RSR | GTO | John Hulen (USA)/Ron Coupland (USA) | John Hulen (USA) | 26th | 8th | 35th | 86 laps |
11 September 1983 - Pocono 500 Miles - IMSA - International Motor Sport Association
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 64 | Porsche 911 Carrera RSR | GTO | John Hulen (USA)/Ron Coupland (USA) | John Hulen (USA) | 12th | 6th | 29th | 150 laps |