| 1.5.1988 | 1000 km Fuji | 1 | 962 C | Takahashi / Mogi | Advan Alpha Nova | 2nd |
| 1.5.1988 | Australian SCC Adelaide | 9 | 935 | John Pollard | | DNA |
| 1.5.1988 | Trans-Am Dallas | 11 | 944 | Chris Kneifel | Bruce Jenner Racing | 15th |
| 1.5.1988 | 1000 km Fuji | 15 | 962 C | Nagasaka / Hoshino / Kageyama | Leyton House Racing Team | 4th |
| 1.5.1988 | 1000 km Fuji | 16 | 962 CK6 | Nissen / Giacomelli | Leyton House Racing Team | 1st |
| 1.5.1988 | Supercup Nürburgring Eifelrennen | 20 | 962 C | Antoine Salamin | Swiss Team Salamin | 6th |
| 1.5.1988 | 1000 km Fuji | 25 | 962 C | Elgh / Sandro Sala | Rothmans Porsche Team Schuppan | 5th |
| 1.5.1988 | 1000 km Fuji | 27 | 962 C | Okada / Dickens | From A Racing | DNF |
| 1.5.1988 | 1000 km Fuji | 55 | 962 C | Acheson / Cobb | Omron Racing Team | 3rd |
| 1.5.1988 | Australian SCC Adelaide | 56 | 911 E | Chris Hones | | DNA |
| 1.5.1988 | 1000 km Fuji | 99 | 962 C | Hitomi / van der Merwe | Trust Racing Team | DNA |
| 1.5.1988 | 1000 km Fuji | 100 | 962 C GTi | Schuppan / Fouché | Trust Racing Team | DNF |
| 1.5.1988 | Supercup Nürburgring Eifelrennen | | 962 C | "John Winter" | Blaupunkt-Joest Racing | 8th |
| 8.5.1988 | 1000 km Silverstone | 7 | 962 C | Wollek / Streiff / Hobbs | Blaupunkt-Joest Racing GmbH | 4th |
| 8.5.1988 | 1000 km Silverstone | 8 | 962 C | Jelinski / Dickens / "Winter" | Joest Racing GmbH | 5th |
| 8.5.1988 | 1000 km Silverstone | 10 | 962 C | Nissen / Grohs | Porsche Kremer Racing | DNF |
| 8.5.1988 | 1000 km Silverstone | 14 | 962 C GTi | Bell / Needell | Richard Lloyd Racing | DQ |
| 8.5.1988 | 1000 km Silverstone | 40 | 962 C | Salamin / Mundas / Cohen-Olivar | Swiss Team Salamin | 7th |
| 8.5.1988 | 1000 km Silverstone | | 962 C | | Brun Motosport | DNA |
| 8.5.1988 | 1000 km Silverstone | | 962 C | | Brun Motosport | DNA |
| 22.5.1988 | 3 h Summit Point [GT] | 04 | 911 Carrera | Auberlen / Durkheimer | SP Racing | 21st |
| 22.5.1988 | 3 h Summit Point [GT] | 42 | 924 | Tradd / Dawe | | 22nd |
| 22.5.1988 | 3 h Summit Point [GT] | 72 | 911 | Kjoller / Mooney | J Kjoller Motorsport | 15th |
| 22.5.1988 | 3 h Summit Point [GT] | 91 | 944 Turbo | Chester Vincentz | Electrodyne Performance | 33rd |
| 22.5.1988 | SM Zeltweg | 262 | 911 Carrera RSR | Alain Pfefferle | | 7th |
| 22.5.1988 | SM Zeltweg | | 935 | Michel Pfefferle | | 2nd |
| 29.5.1988 | Supercup Hockenheim | 6 | 962 C | Walter Brun | Jägermeister-Brun-Motorsport | 5th |
| 29.5.1988 | Supercup Hockenheim | 8 | 962 C | Uwe Schäfer | Jägermeister-Brun-Motorsport | 3rd |
| 29.5.1988 | Supercup Hockenheim | 10 | 962 C | Jochen Dauer | Victor-Dauer-Racing | 6th |
| 29.5.1988 | Supercup Hockenheim | 20? | 962 C | Antoine Salamin | Swiss Team Salamin | 9th |
| 29.5.1988 | Trans-Am Sears Point | 73 | 911 | Larry Chmura | TMI | 17th |
| 29.5.1988 | Supercup Hockenheim | | 962 C | Hans-Joachim Stuck | Porsche AG | 11th |
| 29.5.1988 | Supercup Hockenheim | | 962 C | Bob Wollek | Blaupunkt-Joest Racing | 2nd |
| 29.5.1988 | Supercup Hockenheim | | 962 C | Walter Lechner | Walter Lechner Racing School | 7th |
| 29.5.1988 | Supercup Hockenheim | | 962 C | "John Winter" | Blaupunkt-Joest Racing | 4th |
| 30.5.1988 | 150 lap Lime Rock | 10 | 962 | Hotchkis / Adams | Hotchkis Racing Inc | 9th |
| 30.5.1988 | 150 lap Lime Rock | 14 | 962 | Chip Robinson | Holbert Racing | 4th |
| 30.5.1988 | 150 lap Lime Rock | 14T | 962 | Chip Robinson | Holbert Racing | T-car |
| 30.5.1988 | 150 lap Lime Rock | 15 | 962 | Jourdain / Rothbarth | Kalagian Racing | 8th |
| 30.5.1988 | 150 lap Lime Rock | 16 | 962 | Dyson / Cobb | Dyson Racing | 6th |
| 30.5.1988 | 150 lap Lime Rock | 18 | 962 GTi | James Weaver | Dyson Racing | 23rd |
| 5.6.1988 | 200 km Mid-Ohio [GT] | 04 | 911 Carrera | Bill Auberlen | S P Racing | 18th |
| 5.6.1988 | 500 km Mid-Ohio | 3 | 962 | Oscar Larrauri | Brun/Torno | 29th |
| 5.6.1988 | 500 km Mid-Ohio | 10 | 962 | Hotchkis / Adams | Hotchkis Racing | 9th |
| 5.6.1988 | 500 km Mid-Ohio | 14 | 962 | Robinson / Bell | Holbert Racing | 6th |
| 5.6.1988 | 500 km Mid-Ohio | 15 | 962 | Bundy / Stevens | Kalagian Racing | 19th |
| 5.6.1988 | 500 km Mid-Ohio | 16 | 962 GTi | Cobb / Weaver | Blaupunkt/Dyson | 4th |
| 5.6.1988 | Nordic SS Ahvenisto | 23 | 911 | Christer Adell | Krister Adell | 3rd |
| 5.6.1988 | 500 km Mid-Ohio | 67 | 962 | Wollek / Baldi | Busby Racing | 5th |
| 5.6.1988 | 200 km Mid-Ohio [GT] | 72 | 911 | Jay Kjoller | Jay Kjoller | 22nd |
| 5.6.1988 | 200 km Mid-Ohio [GT] | 91 | 944 Turbo | Chester Vincentz | Electrodyne Performance | 9th |
| 12.6.1988 | 24 h Le Mans | 4 | 962 C | Lechner / Hunkeler / Reuter | Camel Brun Motorsport | DNF |
| 12.6.1988 | 24 h Le Mans | 5 | 962 C | Pareja / Sigala / Schäfer | Repsol Brun Motorsport | 7th |
| 12.6.1988 | 24 h Le Mans | 7 | 962 C | Hobbs / Theys / Konrad | Blaupunkt-Joest Racing | 5th |
| 12.6.1988 | 24 h Le Mans | 8 | 962 C | Dickens / "Winter" / Jelinski | Blaupunkt-Joest Racing | 3rd |
| 12.6.1988 | 24 h Le Mans | 10 | 962 CK6 | Takahashi / Giacomelli / Okada | Kenwwod Kremer | 9th |
| 12.6.1988 | 24 h Le Mans | 11 | 962 C | Nissen / Grohs / Fouché | Leyton House Kremer | 8th |
| 12.6.1988 | 24 h Le Mans | 14 | 962 C GTi | | Lloyd Racing | DNA |
| 12.6.1988 | 24 h Le Mans | 15 | 962 C GTi | | Lloyd Racing | DNA |
| 12.6.1988 | 24 h Le Mans | 17 | 962 C | Stuck / Ludwig / Bell | Porsche AG | 2nd |
| 12.6.1988 | 24 h Le Mans | 17T | 962 C | Michael Andretti | Porsche AG | T-car |
| 12.6.1988 | 24 h Le Mans | 18 | 962 C | Wollek / Schuppan / van der Merwe | Porsche AG | DNF |
| 12.6.1988 | 24 h Le Mans | 19 | 962 C | Andretti / Andretti / Andretti | Porsche AG | 6th |
| 12.6.1988 | 24 h Le Mans | 33 | 962 C | Redman / Jarier / Elgh | Takefuji Schuppan Racing Team | 10th |
| 12.6.1988 | 24 h Le Mans | 35 | 962 C | Lechner / Franzmaier / Hessert | Walter Lechner Racing SChool | DNA |
| 12.6.1988 | 24 h Le Mans | 40 | 962 C | Calderari / Salamin / Cohen-Olivar | Swiss Team Salamin | DNA |
| 12.6.1988 | 24 h Le Mans | 72 | 962 C | Yver / Wood / Lässig | Primagaz Compétition | 11th |
| 19.6.1988 | Trans-Am Detroit | 11 | 944 | Chris Kneifel | Bruce Jenner Racing | 41st |
| 19.6.1988 | Trans-Am Detroit | 42 | 944 | Bruce Jenner | Bruce Jenner Racing | 43rd |
| 19.6.1988 | 24 h Nürburgring | 50 | 911 Carrera RSR | Dorr / Döbler / Barth | Motortuning Horst Derkum | 2nd |
| 19.6.1988 | 24 h Nürburgring | 51 | 911 Carrera RSR | Wussler / Felser / Altenbach | Motortuning Horst Derkum | 10th |
| 19.6.1988 | 24 h Nürburgring | 52 | 911 Carrera RSR | Dören / Holup / Faubel | Original ATE Bremsen | 1st |
| 19.6.1988 | 24 h Nürburgring | 53 | 928 | Mentel / Müller / Kußmaul | Wehmeier & Castrup | DNF |
| 19.6.1988 | 24 h Nürburgring | 55 | 911 Carrera SC | Groß / Spörel / Müchen | Sportfahrergemeinschaft Köln e. V. im ADAC | DNF |
| 19.6.1988 | 24 h Nürburgring | 204 | 944 Turbo | Lehmann / Gallas / Reinisch | | 14th |
| 19.6.1988 | 24 h Nürburgring | 205 | 944 Turbo | Eickwinkel / Eickwinkel / Wlazik | | 7th |
| 19.6.1988 | 24 h Nürburgring | 217 | 944 Turbo | Busch-Ridder / Wagner / Wagner | Löhr und Becker | DQ |
| 19.6.1988 | 24 h Nürburgring | 250 | 924 S Kat. | Ilgner / Kowald | VW Schultz Renngemeinschaft | 22nd |
| 19.6.1988 | SM Dijon | | 911 Carrera RSR | Alain Pfefferle | | ?th |
| 19.6.1988 | SM Dijon | | 911 Carrera RS | Sepp Sacher | | raced |
| 26.6.1988 | Supercup Norisring | 1 | 962 C | Hans-Joachim Stuck | Porsche AG | T-car |
| 26.6.1988 | Supercup Norisring | 1T | 962 C | Hans-Joachim Stuck | Porsche AG | 2nd |
| 26.6.1988 | Supercup Norisring | 2 | 962 C | Bob Wollek | Blaupunkt-Joest Racing | DNF |
| 26.6.1988 | Supercup Norisring | 3 | 962 C | "John Winter" | Blaupunkt-Joest Racing | 6th |
| 26.6.1988 | Supercup Norisring | 4 | 962 C | Philippe Streiff | Joest Racing GmbH | DNA |
| 26.6.1988 | Supercup Norisring | 5 | 962 | Franz Konrad | Joest Racing GmbH | DNF |
| 26.6.1988 | Supercup Norisring | 6 | 962 C | Walter Brun | Jägermeister-Brun-Motorsport | DNF |
| 26.6.1988 | Supercup Norisring | 7 | 962 C | Manuel Reuter | Jägermeister-Brun-Motorsport | 3rd |
| 26.6.1988 | Supercup Norisring | 8 | 962 C | Uwe Schäfer | Jägermeister-Brun-Motorsport | 4th |
| 26.6.1988 | Supercup Norisring | 9 | 962 C | Chip Robinson | Victor-Dauer-Racing | 5th |
| 26.6.1988 | Supercup Norisring | 10 | 962 C | Jochen Dauer | Victor-Dauer-Racing | DNF |
| 26.6.1988 | Supercup Norisring | 11 | 962 C | Bruno Giacomelli | Porsche Kremer Racing | DNA |
| 26.6.1988 | Trans-Am Niagara Falls | 11 | 944 | Chris Kneifel | Bruce Jenner Racing | DNA |
| 26.6.1988 | Supercup Norisring | 12 | 962 C | Kris Nissen | Porsche Kremer Racing | DNS |
| 26.6.1988 | Supercup Norisring | 18 | 962 C | Walter Lechner | Walter Lechner Racing School | DNF |
| 26.6.1988 | Supercup Norisring | 20 | 962 C | Antoine Salamin | Swiss Team Salamin | 8th |
| 26.6.1988 | Supercup Norisring | 35 | 962 C | Heinz-Jörgen Dahmen | Heinz-Jörgen Dahmen | raced |
| 26.6.1988 | Trans-Am Niagara Falls | 42 | 944 | Bruce Jenner | Bruce Jenner Racing | DNQ |
| 2.7.1988 | Trans-Am Cleveland | 42 | 944 | Bruce Jenner | Bruce Jenner Racing | 18th |
| 3.7.1988 | 500 km Watkins Glen | 67 | 962 | Wollek / Baldi | Busby Racing | 4th |