PORSCHE RACING HISTORYRolf Stommelen (D)
1978 : Daytona 24 Hours - 1st overall : Le Mans 24 Hours - 3rd in class : Watkins Glen 6 Hours - 2nd overall
5 February 1978 - Daytona 24 Hours - World Championship for Makes
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 99 | Porsche 935/77A | 930 890 0011 | GTX | Rolf Stommelen (D)/Toine Hezemans (NL)/Peter Gregg (USA) | Brumos Porsche (USA) | 1st | 1st | 4th | 680 laps |
18 March 1978 - Sebring 12 Hours - World Challenge for Endurance Drivers
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 6 | Porsche 935/77A | 930 890 0033 | GTX | Dick Barbour (USA)/Rolf Stommelen (D)/Manfred Schurti (FL) | Dick Barbour Performance (USA) | 57th | 16th | 2nd | 47 laps - Suspension |
11 June 1978 - Le Mans 24 Hours - World Challenge for Endurance Drivers
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 43 | Porsche 935/78 | 935-006 | Gr5+2.0 | Manfred Schurti (FL)/Rolf Stommelen (D) | Martini Racing Porsche System (D) | 8th | 3rd | 3rd | 327 laps |
8 July 1978 - Watkins Glen 6 Hours - World Championship for Makes
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 90 | Porsche 935/77A | 930 890 0024 | Gr.5 | Rolf Stommelen (D)/Manfred Schurti (FL)/Dick Barbour (USA) | Dick Barbour Performance (USA) | 2nd | 2nd | 1st | 146 laps |