PORSCHE RACING HISTORY935/79
1980
3 February 1980 - Daytona 24 Hours - World Championship for Makes
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 59 | Porsche 935/79 | 930 990 0030 | GTX | Peter Gregg (USA)/Hurley Haywood (USA)/Bruce Leven (USA) | Brumos Porsche Audi (USA) | 11th | 7th | 4th | 584 laps |
| 94 | Porsche 935/79 | 930 990 0028 | GTX | Dale Whittington (USA)/Axel Plankenhorn (D) | Whittington Bros. (USA) | 51st | 18th | 5th | 179 laps - Engine |
13 April 1980 - Road Atlanta 100 Miles - IMSA - International Motor Sport Association
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 59 | Porsche 935/79 | 930 990 0030 | GTX | Peter Gregg (USA) | Brumos Porsche (USA) | 3rd | 3rd | 4th | 19 laps |
27 April 1980 - Riverside 5 Hours - World Challenge for Endurance Drivers
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 94 | Porsche 935/79 | 930 990 0028 | GTX | Dale Whittington (USA)/Michael Chandler (USA) | Whittington Brothers Racing (USA) | 4th | 4th | 13th | 160 laps |
| 59 | Porsche 935/79 | 930 990 0030 | GTX | Peter Gregg (USA)/Al Holbert (USA) | Brumos Porsche Audi (USA) | 54th | 17th | 3rd | 27 laps - Oil Pressure |
4 May 1980 - Laguna Seca 100 Miles - IMSA - International Motor Sport Association
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 59 | Porsche 935/79 | 930 990 0030 | GTX | Peter Gregg (USA) | 2nd | 2nd | 1st | 53 laps | |
| 3 | Porsche 935/79 | 930 990 0032 | GTX | Jim Busby (USA) | Jim Busby (USA) | 24th | 11th | 27th | 22 laps - DNF |
26 May 1980 - Lime Rock 1.5 Hours - IMSA - International Motor Sport Association
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 59 | Porsche 935/79 | 930 990 0030 | GTX | Peter Gregg (USA) | 14th | 8th | 1st | 60 laps - DNF |