PORSCHE RACING HISTORY934
1987
7 June 1987 - Mid-Ohio 250 km IMSA GTO - IMSA - International Motor Sport Association
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 91 | Porsche 934 | 009 00030 | GTO | Chester Vincentz (USA)/John Bauer (USA) | Electrodyne Performance | 16th | 12th | 9th | 61 laps |
16 August 1987 - Road America 500 Miles - IMSA - International Motor Sport Association
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 91 | Porsche 934 | 009 00030 | GTO | Chester Vincentz (USA)/John Bauer (USA) | Electrodyne Performance | 34th | 9th | 27th | 63 laps |
4 October 1987 - Columbus IMSA GT - IMSA - International Motor Sport Association
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 91 | Porsche 934 | 009 00030 | GTO | Chester Vincentz (USA) | Electrodyne Performance | 12th | 12th | 12th | 25 laps |