PORSCHE RACING HISTORYJim Busby (USA)
1980
4 May 1980 - Laguna Seca 100 Miles - IMSA - International Motor Sport Association
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 3 | Porsche 935/79 | 930 990 0032 | GTX | Jim Busby (USA) | Jim Busby (USA) | 24th | 11th | 27th | 22 laps - DNF |
27 July 1980 - Sears Point 100 Miles - IMSA - International Motor Sport Association
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 3 | Porsche 935 M16 | 930 990 0032 | GTX | Jim Busby (USA) | Jim Busby (USA) | 6th | 6th | 8th | 39 laps |
3 August 1980 - Portland 100 Miles - IMSA - International Motor Sport Association
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 3 | Porsche 935 M16 | 930 990 0032 | GTX | Jim Busby (USA) | Jim Busby (USA) | 6th | 6th | 6th | 52 laps |
31 August 1980 - Road America 500 Miles - IMSA - International Motor Sport Association
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 30 | Porsche 935 J | 930 890 0014 | GTX | Gianpiero Moretti (I)/Jim Busby (USA) | Momo/Penthouse/Electrodyne (I) | 15th | 7th | 3rd | 110 laps |