PORSCHE RACING HISTORY935
1981
1 February 1981 - Daytona 24 Hours - World Championship for Drivers and Makes
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 07 | Porsche 935 | 930 770 0958 | GTX | Ludwig Heimrath, Sr (CDN)/Ludwig Heimrath, Jr (CDN) | Heimrath Racing (CDN) | 14th | 5th | 17th | 575 laps |
21 March 1981 - Sebring 12 Hours - World Championship for Drivers and Makes
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 07 | Porsche 935 | 930 770 0958 | GTX | Ludwig Heimrath, Sr (CDN)/Ludwig Heimrath, Jr (CDN) | Heimrath Porsche (CDN) | 62nd | 21st | 11th | 57 laps - Accident |
26 April 1981 - Riverside 6 Hours - World Championship for Drivers and Makes
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 21 | Porsche 935 Turbo | GTX | Jamey Mazzotta (USA)/Steve Earle (USA) | KMS Research | 47th | 17th | 16th | 32 laps - DNF |
3 May 1981 - Laguna Seca 100 Miles - IMSA - International Motor Sport Association
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 85 | Porsche 935 | 930 890 0018 | GTX | Bruce Leven (USA) | Bayside Disposal Racing (USA) | 12th | 12th | 20th | 49 laps |
| 12 | Porsche 935 | 009 00029 | GTX | Bruce Canepa (USA) | Bruce Canepa (USA) | 33rd | 17th | 14th | 18 laps - DNF |
10 May 1981 - Silverstone 6 Hours - World Championship for Drivers and Makes
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 25 | Porsche 935 | 930 770 0912 | Gr.5 | Jacques Guérin (F)/Christian Bussi (F)/Jean-Pierre Delaunay (F) | Jacques Guerin (F) | 10th | 4th | 26th | 192 laps |
12 July 1981 - Watkins Glen 6 Hours - World Championship for Drivers and Makes
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 7 | Porsche 935 | 930 770 0958 | Gr.5 | Ludwig Heimrath, Sr (CDN)/Ludwig Heimrath, Jr (CDN) | Heimrath Racing (CDN) | DNF | 12th | 64 laps - Drive Shaft |
26 July 1981 - Sears Point 100 Miles - IMSA - International Motor Sport Association
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 12 | Porsche 935 | 009 00029 | GTX | Bruce Canepa (USA) | Bruce Canepa (USA) | 9th | 7th | 6th | 36 laps - DNF |
13 September 1981 - Road Atlanta 150 Miles - IMSA - International Motor Sport Association
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 22 | Porsche 935 | 930 770 0960 | GTX | Marty Hinze (USA)/Joe Varde (USA) | Marty Hinze (USA) | 25th | 12th | 15th | 9 laps - DNF |
27 September 1981 - Brands Hatch 1000 km - World Championship for Drivers and Makes
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 30 | Porsche 935 | 930 770 0912 | Gr.5 | Jacques Guérin (F)/Christian Bussi (F) | Christian Bussi (F) | 17th | 5th | 22nd | 194 laps |
29 November 1981 - Daytona Finale 250 Miles - IMSA - International Motor Sport Association
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 2 | Porsche 935 | 930 770 0960 | GTX | Marty Hinze (USA) | Marty Hinze (USA) | 70th | 17th | 9th | 0 laps - DNF |