PORSCHE RACING HISTORYChassis No. 962-HR7
10 April 1988 - Road Atlanta 500 km - IMSA - International Motor Sport Association
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 14 | Porsche 962 | 962-HR7 | GTP | Chip Robinson (USA)/Derek Bell (GB) | Holbert Racing (USA) | 3rd | 3rd | 2nd | 124 laps |
24 April 1988 - West Palm Beach 3 Hours - IMSA - International Motor Sport Association
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 14 | Porsche 962 | 962-HR7 | GTP | Chip Robinson (USA)/Derek Bell (GB) | Holbert Racing (USA) | 14th | 9th | 5th | 102 laps - Engine |
30 May 1988 - Lime Rock 150 laps - IMSA - International Motor Sport Association
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 14 | Porsche 962 | 962-HR7 | GTP | Chip Robinson (USA) | Holbert Racing (USA) | 4th | 4th | 3rd | 150 laps |
5 June 1988 - Mid Ohio 500 km - IMSA - International Motor Sport Association
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 14 | Porsche 962 | 962-HR7 | GTP | Chip Robinson (USA)/Derek Bell (GB) | Holbert Racing (USA) | 6th | 6th | 5th | 127 laps |
3 July 1988 - Watkins Glen 500 km - IMSA - International Motor Sport Association
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 14 | Porsche 962 | 962-HR7 | GTP | Chip Robinson (USA)/Derek Bell (GB) | Holbert Racing (USA) | 2nd | 2nd | 2nd | 92 laps |
17 July 1988 - Road America 500 km - IMSA - International Motor Sport Association
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 14 | Porsche 962 | 962-HR7 | GTP | Chip Robinson (USA)/Derek Bell (GB) | Holbert Racing (USA) | 2nd | 2nd | 9th | 78 laps |
31 July 1988 - Portland 300 km - IMSA - International Motor Sport Association
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 14 | Porsche 962 | 962-HR7 | GTP | Chip Robinson (USA) | Holbert Racing (USA) | 18th | 10th | 8th | 87 laps |
14 August 1988 - Sears Point 300 km - IMSA - International Motor Sport Association
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 14 | Porsche 962 | 962-HR7 | GTP | Chip Robinson (USA)/Derek Bell (GB) | Holbert Racing (USA) | 6th | 6th | 9th | 74 laps |
4 September 1988 - San Antonio 3 Hours - IMSA - International Motor Sport Association
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 14 | Porsche 962 | 962-HR7 | GTP | Chip Robinson (USA)/Derek Bell (GB) | Holbert Racing (USA) | 11th | 7th | 8th | 115 laps - DNF |
5 February 1989 - Daytona 24 Hours - IMSA - International Motor Sport Association
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 68 | Porsche 962 | 962-HR7 | GTP | Mario Andretti (USA)/Michael Andretti (USA) | Busby Racing (USA) | 47th | 16th | 9th | 237 laps - Brakes |