| 28.8.1988 | 1000 km Suzuka | 15 | 962 C | Hoshino / Kageyama | Leyton House Racing Team | 6th |
| 28.8.1988 | 1000 km Suzuka | 100 | 962 C GTi | Schuppan / Fouché | Trust Racing Team | 15th |
| 28.8.1988 | Australian SCC Oran Park | | 911 E | Chris Hones | | 6th |
| 28.8.1988 | Nordic SS Jyllandsringen | | 911 | Christer Adell | | 5th |
| 4.9.1988 | 1000 km Nürburgring | 4 | 962 C | Huysman / Brun | Brun Motorsport | 6th |
| 4.9.1988 | 1000 km Nürburgring | 5 | 962 C | Schäfer / Larrauri | Brun Motorsport | 11th |
| 4.9.1988 | 1000 km Nürburgring | 6 | 962 C | Reuter / Pareja | Brun Motorsport | 5th |
| 4.9.1988 | 1000 km Nürburgring | 7 | 962 C | Wollek / Barilla | Blaupunkt-Joest Racing | 3rd |
| 4.9.1988 | 1000 km Nürburgring | 8 | 962 C | Jelinski / "Winter" | Blaupunkt-Joest Racing | 4th |
| 4.9.1988 | 3 h San Antonio | 10 | 962 | Hotchkis / Adams | Hotchkis Racing | DNS |
| 4.9.1988 | 1000 km Nürburgring | 10 | 962 CK6 | Giacomelli / Weidler | Porsche Kremer Racing | 10th |
| 4.9.1988 | 1000 km Nürburgring | 10T | 962 C | Giacomelli / Weidler | Porsche Kremer Racing | T-car |
| 4.9.1988 | 1000 km Nürburgring | 14 | 962 C GTi | Hobbs / Donnelly | Richard Lloyd Racing | 7th |
| 4.9.1988 | 3 h San Antonio | 14 | 962 | Robinson / Bell | Holbert Racing | 11th |
| 4.9.1988 | 3 h San Antonio | 15 | 962 | Graham / Bundy | Kalagian Racing | 5th |
| 4.9.1988 | 1000 km Nürburgring | 16 | 962 C | Dauer / Konrad | Victor Dauer Racing | DNF |
| 4.9.1988 | 3 h San Antonio | 16 | 962 GTi | Cobb / Weaver | Dyson Racing | 1st |
| 4.9.1988 | 1000 km Nürburgring | 20 | 962 C | Lee-Davey / Dodd-Noble / Oberndorfer | Tim Lee-Davey | DNF |
| 4.9.1988 | 3 h San Antonio | 30 | 962 | Moretti / Dickens | Momo Corse | 19th |
| 4.9.1988 | 1000 km Nürburgring | 35 | 962 C | Walter Lechner | Watler Lechner Racing School | DNA |
| 4.9.1988 | 1000 km Nürburgring | 40 | 962 C | Salamin / Lavaggi | Swiss Team Salamin | 9th |
| 4.9.1988 | Trans-Am Mid-Ohio | 42 | 944 | Bruce Jenner | Bruce Jenner Racing | DNS |
| 5.9.1988 | Lime Rock [GTU] | 79 | 911 | Peter Dawe | Promotion Motorsports | 9th |
| 5.9.1988 | Lime Rock [GTU] | 89 | 911 | Hendricks / Jones | Dynamic Air Condition | 16th |
| 5.9.1988 | Lime Rock [GTO] | 91 | 944 Turbo | Chester Vincentz | Electrodyne Performance | 6th |
| 11.9.1988 | Trans-Am Road America | 11 | 944 Turbo | Bruce Jenner | Bruce Jenner Racing | DNS |
| 11.9.1988 | Nordic SS Kemora | 28 | 911 S | Christer Adell | | DNF |
| 11.9.1988 | Trans-Am Road America | 72 | 944 | Chris Kneifel | Bruce Jenner Racing | DNA |
| 11.9.1988 | Australian SCC Sandown | | 911 E | Chris Hones | | 13th |
| 11.9.1988 | Australian SCC Sandown | | 935 | John Pollard | | 4th |
| 18.9.1988 | 1000 km Spa | 4 | 962 C | Brun / Larrauri / Reuter | Brun Motorsport | DNF |
| 18.9.1988 | 1000 km Spa | 5 | 962 C | Larrauri / Reuter | Brun Motorsport | 4th |
| 18.9.1988 | 1000 km Spa | 7 | 962 C | Wollek / Barilla | Blaupunkt Joest Racing | DNF |
| 18.9.1988 | 1000 km Spa | 8 | 962 C | "Winter" / Jelinski | Joest Racing GmbH | DNF |
| 18.9.1988 | 1000 km Spa | 10 | 962 CK6 | Giacomelli / Weidler | Kremer Porsche Racing | DNA |
| 18.9.1988 | 1000 km Spa | 14 | 962 C GTi | Bell / Donnelly | Richard Lloyd Racing | DNF |
| 18.9.1988 | 1000 km Spa | 20 | 962 C | Lee-Davey / Dodd-Noble | Team Davey | 8th |
| 18.9.1988 | 1000 km Spa | 35 | 962 C | Lechner / Franzmaier / Dauer | Walter Lechner Racing School | DNF |
| 18.9.1988 | 1000 km Spa | 40 | 962 C | Salamin / Lavaggi | Swiss Team Salamin | 7th |
| 25.9.1988 | Supercup Nürburgring Supersprint | 1 | 962 C | Hans-Joachim Stuck | Porsche AG | 1st |
| 25.9.1988 | Supercup Nürburgring Supersprint | 3 | 962 C | Bob Wollek | Blaupunkt Joest Racing | 2nd |
| 25.9.1988 | Supercup Nürburgring Supersprint | 4 | 962 C | "John Winter" | Blaupunkt Joest Racing | DNF |
| 25.9.1988 | Supercup Nürburgring Supersprint | 5 | 962 C | Franz Konrad | Joest Racing GmbH | 8th |
| 25.9.1988 | Supercup Nürburgring Supersprint | 6 | 962 C | Walter Brun | Jägermeister Brun Motorsport | 9th |
| 25.9.1988 | Supercup Nürburgring Supersprint | 7 | 962 C | | Jägermeister Brun Motorsport | DNA |
| 25.9.1988 | Supercup Nürburgring Supersprint | 8 | 962 C | Uwe Schäfer | Jägermeister Brun Motorsport | 6th |
| 25.9.1988 | Supercup Nürburgring Supersprint | 10 | 962 C | Jochen Dauer | Victor Dauer Racing | 7th |
| 25.9.1988 | Supercup Nürburgring Supersprint | 18 | 962 C | Walter Lechner | Walter Lechner Racing School | raced |
| 25.9.1988 | Supercup Nürburgring Supersprint | 20 | 962 C | Antoine Salamin | Suisse Team Salamin | raced |
| 25.9.1988 | Supercup Nürburgring Supersprint | 25 | 962 C | Heinz-Jörgen Dahmen | Heinz-Jörgen Dahmen | 10th |
| 25.9.1988 | Supercup Nürburgring Supersprint | 26 | 962 C | Klaus Ludwig | Porsche AG | 4th |
| 25.9.1988 | Trans-Am Mosport | 42 | 944 Turbo | Bruce Jenner | Bruce Jenner Racing | DNA |
| 25.9.1988 | Trans-Am Mosport | 72 | 944 | Chris Kneifel | Bruce Jenner Racing | DNA |
| 25.9.1988 | 500 km Watkins Glen [GT] | 72 | 911 | Jay Kjoller | J Kjoller Motorsport | 15th |
| 25.9.1988 | 500 km Watkins Glen [GT] | 79 | 911 | Dawe / Tradd | Promotion Motorsports | 12th |
| 25.9.1988 | 500 km Watkins Glen [GT] | 89 | 911 | Ray Hendricks | Dynamic Air Condition | 34th |
| 25.9.1988 | 500 km Watkins Glen [GT] | 91 | 944 Turbo | Chester Vincentz | Electrodyne Performance | 33rd |
| 2.10.1988 | 300 km Columbus | 10 | 962 | Hotchkis / Adams | Hotchkis Racing Inc | 9th |
| 2.10.1988 | 300 km Columbus | 14 | 962 | | Holbert Racing | DNS |
| 2.10.1988 | 300 km Columbus | 15 | 962 | Graham / Jourdain | Kalagian Racing | 11th |
| 2.10.1988 | 300 km Columbus | 16 | 962 | Dyson / Pruett | Dyson Racing | 18th |
| 2.10.1988 | 300 km Columbus | 18 | 962 GTi | Cobb / Weaver | Dyson Racing | 25th |
| 2.10.1988 | 300 km Columbus | 30 | 962 | Moretti / Phillips | Momo Corse | 13th |
| 2.10.1988 | 300 km Columbus | 67 | 962 | Wollek / Baldi | Busby Racing | 3rd |
| 2.10.1988 | 45 min Columbus [GT] | 72 | 911 | Jay Kjoller | J Kjoller Motorsport | 31st |
| 2.10.1988 | 300 km Columbus | 85 | 962 | Klaus Ludwig | Bayside-Leven Motorsport | 2nd |
| 2.10.1988 | 300 km Columbus | 86 | 962 | Bruce Leven | Bayside-Leven Motorsport | 36th |
| 2.10.1988 | 300 km Columbus | 86T | 962 C | Klaus Ludwig | Bayside-Leven Motorsport | T-car |
| 2.10.1988 | 45 min Columbus [GT] | 89 | 911 | Bruce Jones | Dynamic Air Condition | 26th |
| 2.10.1988 | 45 min Columbus [GT] | 91 | 944 Turbo | Chester Vincentz | Electrodyne Performance | 18th |
| 9.10.1988 | 1000 km Fuji | 7 | 962 C | Wollek / Grohs | Joest Racing | DNF |
| 9.10.1988 | 1000 km Fuji | 8 | 962 C | Jelinski / "Winter" | Joest Racing | 3rd |
| 9.10.1988 | 1000 km Fuji | 10 | 962 CK6 | Weidler / Reuter | Porsche Kremer Racing | DNF |
| 9.10.1988 | 1000 km Fuji | 11 | 962 CK6 | Larrauri / Giacomelli | Leyton House with Porsche Kremer | 16th |
| 9.10.1988 | 1000 km Fuji | 14 | 962 C GTi | Weaver / Donnelly | Richard Lloyd Racing | DNA |
| 9.10.1988 | 1000 km Fuji | 17 | 962 C | Cobb / Ludwig | Omron Porsche AG | 2nd |
| 9.10.1988 | 1000 km Fuji | 20 | 962 C | Lee-Davey / Dodd-Noble / Iketani | Team Davey | DNF |
| 9.10.1988 | 1000 km Fuji | 25 | 962 C | Takahashi / Mogi | Advan Alpha Nova | 6th |
| 9.10.1988 | 1000 km Fuji | 27 | 962 C | Okada / Dickens | From A Racing | 4th |
| 9.10.1988 | 1000 km Fuji | 28 | 962 C | Nagasaka / Hoshino / Kageyama | Leyton House Racing Team | 8th |
| 9.10.1988 | 1000 km Fuji | 33 | 962 C | Bell / Redman | Takefuji Racing Team | 17th |
| 9.10.1988 | 1000 km Fuji | 77 | 962 C | Needell / Moretti / Huysman | Memorex Telex Racing Team | DNF |
| 9.10.1988 | 1000 km Fuji | 99 | 962 C | Elgh / Sandro Sala | Rothmans Porsche Team Schuppan | 7th |
| 9.10.1988 | 1000 km Fuji | 100 | 962 C GTi | Fouché / Schuppan / van der Merwe | Trust Racing Team | 10th |
| 9.10.1988 | 1000 km Fuji | 100T | 962 C | Schuppan / Fouché / van der Merwe | Trust Racing Team | T-car |
| 16.10.1988 | Interserie Zeltweg II | 3 | 962 C | Walter Brun | Brun Motorsport | DNF |
| 16.10.1988 | Interserie Zeltweg II | 7 | 962 C | Heinz-Jörgen Dahmen | Heinz-Jörgen Dahmen | DNS |
| 16.10.1988 | Interserie Zeltweg II | 9 | 962 C | Jochen Dauer | Dauer Racing | 1st |
| 16.10.1988 | Interserie Zeltweg II | 10 | 962 C | Franz Konrad | Dauer Racing | 2nd |
| 16.10.1988 | Interserie Zeltweg II | | 962 C | Walter Lechner | Walter Lechner Racing School | DNF |
| 23.10.1988 | 2 h Del Mar | 3 | 962 C | Larrauri / Sigala | Brun Motorsport | 7th |
| 23.10.1988 | 2 h Del Mar | 10 | 962 | Adams / Hotchkis | Hotchkis Racing Inc | DNS |
| 23.10.1988 | 2 h Del Mar | 14 | 962 | | | DNA |
| 23.10.1988 | 2 h Del Mar | 15 | 962 | Jourdain / Graham | Kalagian Racing | 15th |
| 23.10.1988 | 2 h Del Mar | 16 | 962 | Rob Dyson | Dyson Racing | 23rd |
| 23.10.1988 | 2 h Del Mar | 18 | 962 GTi | Cobb / Weaver | Dyson Racing | 6th |
| 23.10.1988 | 2 h Del Mar | 30 | 962 | Moretti / Phillips | Momo Corse | 12th |
| 23.10.1988 | 2 h Del Mar | 67 | 962 | Bob Wollek | Busby Racing | 3rd |
| 23.10.1988 | 2 h Del Mar | 85 | 962 | | Bayside-Leven Motorsport | DNA |
| 23.10.1988 | 2 h Del Mar | 86 | 962 | Klaus Ludwig | Bayside-Leven Motorsport | 2nd |