PORSCHE RACING HISTORYMike Schaefer (USA)
1984
5 February 1984 - Daytona 24 Hours - IMSA - International Motor Sport Association
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 90 | Porsche 911 SC | 911 030 1263 | GTU | Mike Schaefer (USA)/Jeff Andretti (USA)/Nick Nicholson (USA)/Jack Refenning (USA) | 901 Shop | 43rd | 12th | 12th | 258 laps - DNF |
25 November 1984 - Daytona Finale 3 Hours - IMSA - International Motor Sport Association
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 09 | Porsche 911 Carrera RSR | GTO | Mike Schaefer (USA)/Peter Uria (USA)/Jack Refenning (USA) | 27th | 8th | 68th | 75 laps |