PORSCHE RACING HISTORYJim Busby (USA)
1978 : Le Mans 24 Hours - 1st in class : Mid Ohio 250 Miles - 1st overall
5 February 1978 - Daytona 24 Hours - World Championship for Makes
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 13 | Porsche 935 | 930 670 0180 | GTX | Hal Shaw, Jr. (USA)/Jim Busby (USA)/Howard Meister (USA) | Hal Shaw Racing (USA) | 10th | 7th | 9th | 608 laps |
11 June 1978 - Le Mans 24 Hours - World Challenge for Endurance Drivers
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 44 | Porsche 935/77A | 930 890 0012 | Gr5+2.0 | Jim Busby (USA)/Rick Knoop (USA)/Chris Cord (USA) | Porsche Kremer Racing (D) | 6th | 1st | 14th | 337 laps |
27 August 1978 - Mid Ohio 250 Miles - IMSA - International Motor Sport Association
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 94 | Porsche 935/77A | 930 890 0023 | GTX | Bill Whittington (USA)/Jim Busby (USA) | Whittington Brothers Racing (USA) | 1st | 1st | 6th | 104 laps |