| 10.4.1988 | 1000 km Monza | 4 | #117 | Schäfer / Brun | Brun Motorsport | DNF |
| 10.4.1988 | 1000 km Monza | 5 | #002BM | Reuter / Pareja | Brun Motorsport | DNF |
| 10.4.1988 | 1000 km Monza | 6 | #115 | Larrauri / Sigala | Brun Motorsport | 3rd |
| 10.4.1988 | 1000 km Monza | 7 | #129 | Ludwig / Wollek | Joest Racing | 5th |
| 10.4.1988 | 1000 km Monza | 8 | #116 | Jelinski / "Winter" | Joest Racing | 4th |
| 10.4.1988 | 1000 km Monza | 10 | #118CK-4 | Weidler / Giacomelli | Porsche Kremer Racing | 6th |
| 10.4.1988 | 500 km Road Atlanta | 10 | | Hotchkis / Adams | Hotchkis Racing Inc | 10th |
| 10.4.1988 | 1000 km Monza | 14 | #RLR 200 | Needell / Hoy | RLR | DNA |
| 10.4.1988 | 1000 km Monza | 15 | #RLR 201 | Bell / Weaver | RLR | DNA |
| 10.4.1988 | 500 km Road Atlanta | 15 | #HR2 | Rothbarth / Bundy | Kalagian Racing | 7th |
| 10.4.1988 | 500 km Road Atlanta | 16 | #120 | Cobb / Weaver | Dyson Racing | 5th |
| 10.4.1988 | 1000 km Monza | 40 | #131 | Wood / Salamin | Swiss Team Salamin | 9th |
| 10.4.1988 | 500 km Road Atlanta | 62 | #107B | Shelton / Shelton | Shelton Racing | 9th |
| 24.4.1988 | 3 h West Palm Beach | 1 | #HR4 | A. J. Foyt | A J Foyt Enterprises | 22nd |
| 24.4.1988 | Interserie Hockenheim | 1 | #118CK=>WLM02 | Walter Lechner | Walter Lechner Racing School | 4th |
| 24.4.1988 | Interserie Hockenheim | 2 | #116 | "John Winter" | Joest Racing | 2nd |
| 24.4.1988 | 3 h West Palm Beach | 3 | #128 | Sigala / Larrauri | Brun Motorsport | DQ |
| 24.4.1988 | Interserie Hockenheim | 9 | #133 | Jochen Dauer | Dauer Racing | 6th |
| 24.4.1988 | Interserie Hockenheim | 10 | #CK6/88 | Kris Nissen | Porsche Kremer Racing | 1st |
| 24.4.1988 | 3 h West Palm Beach | 10 | | Hotchkis / Adams | Hotchkis Racing Inc | 7th |
| 24.4.1988 | 3 h West Palm Beach | 14 | #HR7 | Robinson / Bell | Holbert Racing | 17th |
| 24.4.1988 | Interserie Hockenheim | 14 | #131 | Antoine Salamin | Swiss Team Salamin | 5th |
| 24.4.1988 | 3 h West Palm Beach | 15 | #HR2 | Rothbarth / Jourdain | Kalagian Racing | 6th |
| 24.4.1988 | 3 h West Palm Beach | 16 | #DR1 | Cobb / Weaver | Dyson Racing | 3rd |
| 24.4.1988 | 3 h West Palm Beach | 67 | #108C (C02) | Wollek / Baldi | Busby Racing | 30th |
| 1.5.1988 | 1000 km Fuji | 1 | #126 | Takahashi / Mogi | Advan Alpha Nova | 2nd |
| 1.5.1988 | Supercup Nürburgring Eifelrennen | 1 | #137=>009 | Hans-Joachim Stuck | Porsche AG | 2nd |
| 1.5.1988 | Supercup Nürburgring Eifelrennen | 2 | #129 | Bob Wollek | Blaupunkt-Joest Racing | 1st |
| 1.5.1988 | Supercup Nürburgring Eifelrennen | 6 | #001BM | Walter Brun | Jägermeister-Brun-Motorsport | 5th |
| 1.5.1988 | Supercup Nürburgring Eifelrennen | 8 | #115 | Uwe Schäfer | Jägermeister-Brun-Motorsport | 3rd |
| 1.5.1988 | Supercup Nürburgring Eifelrennen | 10 | #133 | Jochen Dauer | Victor-Dauer-Racing | 4th |
| 1.5.1988 | 1000 km Fuji | 15 | #114 | Nagasaka / Hoshino / Kageyama | Leyton House Racing Team | 4th |
| 1.5.1988 | 1000 km Fuji | 16 | #CK6 | Nissen / Giacomelli | Leyton House Racing Team | 1st |
| 1.5.1988 | Supercup Nürburgring Eifelrennen | 20 | #131 | Antoine Salamin | Swiss Team Salamin | 6th |
| 1.5.1988 | 1000 km Fuji | 25 | #123/HR6 | Elgh / Sandro Sala | Rothmans Porsche Team Schuppan | 5th |
| 1.5.1988 | 1000 km Fuji | 27 | #132 | Okada / Dickens | From A Racing | DNF |
| 1.5.1988 | 1000 km Fuji | 55 | #123 | Acheson / Cobb | Omron Racing Team | 3rd |
| 1.5.1988 | 1000 km Fuji | 99 | | Hitomi / van der Merwe | Trust Racing Team | DNA |
| 1.5.1988 | 1000 km Fuji | 100 | #106B | Schuppan / Fouché | Trust Racing Team | DNF |
| 1.5.1988 | Supercup Nürburgring Eifelrennen | | #116 | "John Winter" | Blaupunkt-Joest Racing | 8th |
| 1.5.1988 | Supercup Nürburgring Eifelrennen | | #118CK=>WLM02 | Walter Lechner | Walter Lechner Racing School | raced |
| 8.5.1988 | 1000 km Silverstone | 7 | #129 | Wollek / Streiff / Hobbs | Blaupunkt-Joest Racing GmbH | 4th |
| 8.5.1988 | 1000 km Silverstone | 8 | #116 | Jelinski / Dickens / "Winter" | Joest Racing GmbH | 5th |
| 8.5.1988 | 1000 km Silverstone | 10 | #CK6/88 | Nissen / Grohs | Porsche Kremer Racing | DNF |
| 8.5.1988 | 1000 km Silverstone | 14 | #RLR 200 | Bell / Needell | Richard Lloyd Racing | DQ |
| 8.5.1988 | 1000 km Silverstone | 40 | #131 | Salamin / Mundas / Cohen-Olivar | Swiss Team Salamin | 7th |
| 8.5.1988 | 1000 km Silverstone | | | | Brun Motosport | DNA |
| 8.5.1988 | 1000 km Silverstone | | | | Brun Motosport | DNA |
| 29.5.1988 | Supercup Hockenheim | 6 | #001BM | Walter Brun | Jägermeister-Brun-Motorsport | 5th |
| 29.5.1988 | Supercup Hockenheim | 8 | #115 | Uwe Schäfer | Jägermeister-Brun-Motorsport | 3rd |
| 29.5.1988 | Supercup Hockenheim | 10 | #133 | Jochen Dauer | Victor-Dauer-Racing | 6th |
| 29.5.1988 | Supercup Hockenheim | 20? | #131 | Antoine Salamin | Swiss Team Salamin | 9th |
| 29.5.1988 | Supercup Hockenheim | | #116 | "John Winter" | Blaupunkt-Joest Racing | 4th |
| 29.5.1988 | Supercup Hockenheim | | #118CK=>WLM02 | Walter Lechner | Walter Lechner Racing School | 7th |
| 29.5.1988 | Supercup Hockenheim | | #137=>009 | Hans-Joachim Stuck | Porsche AG | 11th |
| 29.5.1988 | Supercup Hockenheim | | #129 | Bob Wollek | Blaupunkt-Joest Racing | 2nd |
| 30.5.1988 | 150 lap Lime Rock | 10 | | Hotchkis / Adams | Hotchkis Racing Inc | 9th |
| 30.5.1988 | 150 lap Lime Rock | 14 | #HR7 | Chip Robinson | Holbert Racing | 4th |
| 30.5.1988 | 150 lap Lime Rock | 14T | | Chip Robinson | Holbert Racing | T-car |
| 30.5.1988 | 150 lap Lime Rock | 15 | #HR2 | Jourdain / Rothbarth | Kalagian Racing | 8th |
| 30.5.1988 | 150 lap Lime Rock | 16 | #120 | Dyson / Cobb | Dyson Racing | 6th |
| 30.5.1988 | 150 lap Lime Rock | 18 | #DR1 | James Weaver | Dyson Racing | 23rd |
| 5.6.1988 | 500 km Mid-Ohio | 3 | #128 | Oscar Larrauri | Brun/Torno | 29th |
| 5.6.1988 | 500 km Mid-Ohio | 10 | | Hotchkis / Adams | Hotchkis Racing | 9th |
| 5.6.1988 | 500 km Mid-Ohio | 14 | #HR7 | Robinson / Bell | Holbert Racing | 6th |
| 5.6.1988 | 500 km Mid-Ohio | 15 | #HR2 | Bundy / Stevens | Kalagian Racing | 19th |
| 5.6.1988 | 500 km Mid-Ohio | 16 | #DR1 | Cobb / Weaver | Blaupunkt/Dyson | 4th |
| 5.6.1988 | 500 km Mid-Ohio | 67 | #108C (C02) | Wollek / Baldi | Busby Racing | 5th |
| 12.6.1988 | 24 h Le Mans | 4 | #117 | Lechner / Hunkeler / Reuter | Camel Brun Motorsport | DNF |
| 12.6.1988 | 24 h Le Mans | 5 | #115 | Pareja / Sigala / Schäfer | Repsol Brun Motorsport | 7th |
| 12.6.1988 | 24 h Le Mans | 7 | #004=>104C | Hobbs / Theys / Konrad | Blaupunkt-Joest Racing | 5th |
| 12.6.1988 | 24 h Le Mans | 8 | #116 | Dickens / "Winter" / Jelinski | Blaupunkt-Joest Racing | 3rd |
| 12.6.1988 | 24 h Le Mans | 10 | #CK6/88 | Takahashi / Giacomelli / Okada | Kenwwod Kremer | 9th |
| 12.6.1988 | 24 h Le Mans | 11 | #118CK-3 | Nissen / Grohs / Fouché | Leyton House Kremer | 8th |
| 12.6.1988 | 24 h Le Mans | 14 | #RLR 200 | | Lloyd Racing | DNA |
| 12.6.1988 | 24 h Le Mans | 15 | #RLR 201 | | Lloyd Racing | DNA |
| 12.6.1988 | 24 h Le Mans | 17 | #140=>010 | Stuck / Ludwig / Bell | Porsche AG | 2nd |
| 12.6.1988 | 24 h Le Mans | 17T | #006 | Michael Andretti | Porsche AG | T-car |
| 12.6.1988 | 24 h Le Mans | 18 | #135=>007 | Wollek / Schuppan / van der Merwe | Porsche AG | DNF |
| 12.6.1988 | 24 h Le Mans | 19 | #136=>008 | Andretti / Andretti / Andretti | Porsche AG | 6th |
| 12.6.1988 | 24 h Le Mans | 33 | #123 | Redman / Jarier / Elgh | Takefuji Schuppan Racing Team | 10th |
| 12.6.1988 | 24 h Le Mans | 35 | #118CK=>WLM02 | Lechner / Franzmaier / Hessert | Walter Lechner Racing SChool | DNA |
| 12.6.1988 | 24 h Le Mans | 40 | #131 | Calderari / Salamin / Cohen-Olivar | Swiss Team Salamin | DNA |
| 12.6.1988 | 24 h Le Mans | 72 | #130 | Yver / Wood / Lässig | Primagaz Compétition | 11th |
| 26.6.1988 | Supercup Norisring | 1 | #137=>009 | Hans-Joachim Stuck | Porsche AG | T-car |
| 26.6.1988 | Supercup Norisring | 1T | #140=>010 | Hans-Joachim Stuck | Porsche AG | 2nd |
| 26.6.1988 | Supercup Norisring | 2 | #129 | Bob Wollek | Blaupunkt-Joest Racing | DNF |
| 26.6.1988 | Supercup Norisring | 3 | #004=>104C | "John Winter" | Blaupunkt-Joest Racing | 6th |
| 26.6.1988 | Supercup Norisring | 4 | | Philippe Streiff | Joest Racing GmbH | DNA |
| 26.6.1988 | Supercup Norisring | 5 | #116IM | Franz Konrad | Joest Racing GmbH | DNF |
| 26.6.1988 | Supercup Norisring | 6 | #001BM | Walter Brun | Jägermeister-Brun-Motorsport | DNF |
| 26.6.1988 | Supercup Norisring | 7 | #117 | Manuel Reuter | Jägermeister-Brun-Motorsport | 3rd |
| 26.6.1988 | Supercup Norisring | 8 | #002BM | Uwe Schäfer | Jägermeister-Brun-Motorsport | 4th |
| 26.6.1988 | Supercup Norisring | 9 | #112a | Chip Robinson | Victor-Dauer-Racing | 5th |
| 26.6.1988 | Supercup Norisring | 10 | #133 | Jochen Dauer | Victor-Dauer-Racing | DNF |
| 26.6.1988 | Supercup Norisring | 11 | | Bruno Giacomelli | Porsche Kremer Racing | DNA |
| 26.6.1988 | Supercup Norisring | 12 | #118 | Kris Nissen | Porsche Kremer Racing | DNS |
| 26.6.1988 | Supercup Norisring | 18 | #118CK=>WLM02 | Walter Lechner | Walter Lechner Racing School | DNF |
| 26.6.1988 | Supercup Norisring | 20 | #131 | Antoine Salamin | Swiss Team Salamin | 8th |
| 26.6.1988 | Supercup Norisring | 35 | #112=>009/88D | Heinz-Jörgen Dahmen | Heinz-Jörgen Dahmen | raced |