PORSCHE RACING HISTORYChester Vincentz (USA)
1986 : Road Atlanta IMSA GTO - 2nd overall : Watkins Glen 500 Miles - 3rd in class
2 March 1986 - Miami GP 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) | Electrodyne Performance | 33rd | 33rd | 21st | 5 laps - DNF |
5 April 1986 - Road Atlanta 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) | Electrodyne Performance | 2nd | 2nd | 9th | 32 laps |
17 May 1986 - Chartlotte 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) | Electrodyne Performance | 26th | 18th | 6th | 37 laps - DNF |
8 June 1986 - 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 | 20th | 9th | 8th | 57 laps - DNF |
22 June 1986 - West Palm Beach 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) | Electrodyne Performance | 4th | 4th | 17th | 35 laps |
6 July 1986 - Watkins Glen 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 | 14th | 3rd | 27th | 133 laps |
24 August 1986 - 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 | 38th | 9th | 26th | 82 laps - Mechanical |
1 September 1986 - Lime Rock 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)/Mark Hutchins (USA) | Electrodyne Performance | 6th | 4th | 19th | 116 laps |
20 September 1986 - Watkins Glen 500 km GT - 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 | 6th | 6th | 10th | 53 laps |
5 October 1986 - 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 | 9th | 9th | 11th | 31 laps |