PORSCHE RACING HISTORYAxel Plankenhorn (D)
1980 : DRM Zolder Bergischer Löwe - 3rd overall : Nürburgring 1000 km - 2nd overall, 1st in class : DRM Spa - 2nd overall
3 February 1980 - Daytona 24 Hours - World Championship for Makes
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 94 | Porsche 935/79 | 930 990 0028 | GTX | Dale Whittington (USA)/Axel Plankenhorn (D) | Whittington Bros. (USA) | 51st | 18th | 5th | 179 laps - Engine |
23 March 1980 - DRM Zolder Bergischer Löwe - DRM - Deutsche Rennsport Meisterschaft
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 2 | Porsche 935 K3/80 | 000 00011 | Gr.5 | Axel Plankenhorn (D) | Jägermeister Kremer Racing (D) | 3rd | 3rd | 1st | 24 laps |
11 May 1980 - Silverstone 6 Hours - World Championship for Makes
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 19 | Porsche 935 K3/80 | 000 00011 | Gr.5 | Guy Edwards (GB)/John Fitzpatrick (GB)/Axel Plankenhorn (D) | Porsche Kremer Racing (D) | DNF | 1st | 128 laps - Piston |
25 May 1980 - Nürburgring 1000 km - World Championship for Makes
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 6 | Porsche 935 K3 | 000 0009 | Gr.5 | John Fitzpatrick (GB)/Axel Plankenhorn (D)/Dick Barbour (USA) | Sachs-Sporting-Dick-Barbour-Team (USA) | 2nd | 1st | 3rd | 44 laps |
1 June 1980 - DRM Spa - DRM - Deutsche Rennsport Meisterschaft
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 2 | Porsche 935 K3/80 | 000 00011 | Gr.5 | Axel Plankenhorn (D) | Jägermeister Kremer Racing (D) | 2nd | 2nd | 3rd | 15 laps |
15 June 1980 - Le Mans 24 Hours - World Championship for Makes
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 42 | Porsche 935 K3 | 930 670 0163 | Gr.5 | Rolf Stommelen (D)/Axel Plankenhorn (D)/Tetsu Ikuzawa (J) | Gozzy Kremer Racing (D) | DNF | 3rd | 167 laps - Head Gasket |