PORSCHE RACING HISTORYBob Bergstrom (USA)
1981 : Mosport 6 Hours - 3rd in class
24 May 1981 - Lime Rock 200 Miles - IMSA - International Motor Sport Association
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 79 | Porsche 924 Carrera GTR | WP0ZZZ93ZBS720006 | GTO | Tom Winters (USA)/Bob Bergstrom (USA) | Whitehall Promotions (USA) | 14th | 7th | 25th | 111 laps |
12 July 1981 - Watkins Glen 6 Hours - World Championship for Drivers and Makes
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 79 | Porsche 924 Carrera GTR | WP0ZZZ93ZBS720006 | GTO | Tom Winters (USA)/Bob Bergstrom (USA) | Promotion Ltd./Whitehall Capital (USA) | DNF | 18th | 23 laps - Drive Shaft |
16 August 1981 - Mosport 6 Hours - World Championship for Drivers and Makes
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 79 | Porsche 924 Carrera GTR | WP0ZZZ93ZBS720006 | GTO | Tom Winters (USA)/Bob Bergstrom (USA) | Whitehall Capital Promotions Limited (USA) | 13th | 3rd | 24th | 203 laps |
23 August 1981 - Road America 500 Miles - World Championship for Drivers and Makes
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 79 | Porsche 924 Carrera GTR | WP0ZZZ93ZBS720006 | GTO | Tom Winters (USA)/Bob Bergstrom (USA) | Promotion Ltd. Whitehall Capital (USA) | 23rd | 5th | 33rd | 94 laps - Drive Shaft |
30 August 1981 - Mid-Ohio 500 km - Non Championship Race
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 79 | Porsche 924 Carrera GTR | WP0ZZZ93ZBS720006 | Gr.4 | Tom Winters (USA)/Bob Bergstrom (USA) | Promotion Ltd. (USA) | 8th | 4th | 17th | 117 laps |