| 1.6.1991 | 1 h Mid-Ohio [GT] | 89 | 911 | Bruce Jones | Dynamic Air Conditioning | 14th |
| 2.6.1991 | 300 km Mid-Ohio | 7 | 962 C | "Winter" / Schneider | Joest Porsche Racing | 20th |
| 2.6.1991 | 300 km Mid-Ohio | 16 | 962 C | Weaver | Dyson Racing | 8th |
| 15.6.1991 | New Orleans [GT] | 8 | 911 | Randy Greff | | 23rd |
| 15.6.1991 | New Orleans [GT] | 26 | 911 | Joe Pezza | Alex Job Racing | 8th |
| 16.6.1991 | 24 h Nürburgring | 205 | 911 Carrera 2 | Pichl / Vogt / Mayländer | | 9th |
| 16.6.1991 | 24 h Nürburgring | 208 | 944 Turbo S | Wirdheim / Hemmerich / Veertee / Molzberger | Porsche Sport Club Sweden | DNF |
| 16.6.1991 | 24 h Nürburgring | 209 | 911 Carrera 2 | Weiner / Dören / Tilke | | 22nd |
| 16.6.1991 | 24 h Nürburgring | 210 | 911 Carrera 2 | Rosenkranz / Göbel / Fritzsche / Fritzsche | | 4th |
| 16.6.1991 | 24 h Nürburgring | 211 | 911 Carrera 2 | Memminger / Röhrl / Müller / Probst | Wehmeier & Castrup HJS Team | DNF |
| 16.6.1991 | 24 h Nürburgring | 213 | 944 Turbo S | Röhrl / Mentel / Kußmaul | Wehmeier & Castrup HJS Team | DNF |
| 16.6.1991 | 24 h Nürburgring | 214 | 911 Carrera | Dorr / Döbler / Faubel | Horst Derkum GmbH Bergisch Gladbach | 8th |
| 16.6.1991 | 24 h Nürburgring | 215 | 911 Carrera 2 | Alzen / Alzen / "hpl liemans" / Lischke | Team Löhr und Becker Porsche Koblenz | 3rd |
| 16.6.1991 | 24 h Nürburgring | 216 | 911 Carrera 2 | Capra / Quargentan / da Schio / Quargentan | Seikel Motorsport | DNF |
| 16.6.1991 | 24 h Nürburgring | 217 | | Lechtermann / Lechtermann / Brust / Meinke | MSC Gütersloh | DNF |
| 16.6.1991 | 24 h Nürburgring | 218 | 911 Carrera 2 | von Gartzen / Grohs / Manthey / Göbel | Goebel Sport Duisburg | 2nd |
| 16.6.1991 | 24 h Nürburgring | 219 | 911 Carrera 2 | Unser / Unser / Forbes-Robinson / Kußmaul | Porsche AG | 14th |
| 16.6.1991 | 24 h Nürburgring | 221 | 911 Carrera 2 | Bergmeister / Bobach / Barth / Destree | Bergmeister Sport Audi-VW | 11th |
| 23.6.1991 | 24 h Le Mans | 11 | 962 CK6 | Reuter / Toivonen / Lehto | Porsche Kremer Racing | 9th |
| 23.6.1991 | 24 h Le Mans | 11T | 962 CK6 | Reuter / Toivonen / Lehto | Porsche Kremer Racing | T-car |
| 23.6.1991 | 24 h Le Mans | 14 | 962 C | Salamin / Cohen-Olivar / Tarrès | Team Salamin Primagaz | DNF |
| 23.6.1991 | 24 h Le Mans | 16 | 962 C | Huysman / Santal / Stirling | Repsol Brun Motorsport | DNF |
| 23.6.1991 | 24 h Le Mans | 17 | 962 C | Larrauri / Pareja / Brun | Repsol Brun Motorsport | 10th |
| 23.6.1991 | 24 h Le Mans | 21 | 962 C | Konrad / Lombardi / Reid | Konrad Motorsport | DNF |
| 23.6.1991 | 24 h Le Mans | 46 | 962 CK6 | Needell / Lopez / Foitek | Porsche Kremer Racing | DNF |
| 23.6.1991 | 24 h Le Mans | 49 | 962 C | Fouché / Andskar | Courage Compétition (Trust Racing) | DNF |
| 23.6.1991 | 24 h Le Mans | 50 | 962 C | Alméras / de Thoisy / Alméras | Courage Compétition (Almeras Frères) | DNF |
| 23.6.1991 | 24 h Le Mans | 51 | 962 C | Altenbach / Yver / Lässig | Team Salamin Primagaz (Obermaier Racing) | DNF |
| 23.6.1991 | 24 h Le Mans | 52 | 962 C | Ratzenberger / Elgh / Hoy | Team Salamin Primagaz (Team Schuppan) | DNF |
| 23.6.1991 | 24 h Le Mans | 53 | 962 C | Weaver / Haywood / Taylor | Team Salamin Primagaz (Team Schuppan) | T-car |
| 23.6.1991 | 24 h Le Mans | 53T | 962 C | Weaver / Haywood / Taylor | Team Salamin Primagaz (Team Schuppan) | NC |
| 23.6.1991 | 24 h Le Mans | 54 | 962 C | Iketani / Stermitz | Team Salamin Primagaz (Team Davey) | DNQ |
| 23.6.1991 | 24 h Le Mans | 57 | 962 C | Schneider / Pescarolo / "Winter" | Konrad Motorsport (Joest Porsche) | DNF |
| 23.6.1991 | 24 h Le Mans | 58 | 962 C | Stuck / Jelinski / Bell | Konrad Motorsport (Joest Porsche) | 7th |
| 23.6.1991 | 24 h Le Mans | 59 | 962 C | Barth | Konrad Motorsport (Joest Porsche) | DNS |
| 23.6.1991 | 24 h Le Mans | | 962 C | Franz Konrad | Konrad Motorsport | DNA |
| 30.6.1991 | 500 km Watkins Glen | 7 | 962 C | "Winter" / Schneider | Joest Racing | 6th |
| 30.6.1991 | 500 km Watkins Glen | 16 | 962 C | James Weaver | Dyson Racing | 19th |
| 30.6.1991 | IMSA Supercar Watkins Glen | 58 | 964 Turbo | Joe Varde | Brumos Racing | 2nd |
| 30.6.1991 | IMSA Supercar Watkins Glen | 59 | 964 Turbo | Hurley Haywood | Brumos Motor Cars | 1st |
| 20.7.1991 | 1 h Laguna Seca [GT] | 26 | 911 | Joe Pezza | Alex Job Racing | 10th |
| 21.7.1991 | 500 mile Fuji | 2 | 962 C | Takahashi / Dickens | Team Taisan Klepper | DNA |
| 21.7.1991 | 500 mile Fuji | 7 | 962 C | Needell / Reid | The Alpha Racing | DNA |
| 21.7.1991 | 300 km Laguna Seca | 7 | 962 C | "Winter" / Schneider | Joest Racing | 4th |
| 21.7.1991 | 300 km Laguna Seca | 16 | 962 C | James Weaver | Dyson Racing | 6th |
| 21.7.1991 | 300 km Laguna Seca | 30 | 962 C | Gianpiero Moretti | Momo-Joest Racing | 19th |
| 21.7.1991 | IMSA Supercar Laguna Seca | 50 | 911 Carrera 4 | Frank Gallogly | - | DNA |
| 21.7.1991 | IMSA Supercar Laguna Seca | 58 | 964 Turbo | Joe Varde | Brumos Motor Cars | 5th |
| 21.7.1991 | IMSA Supercar Laguna Seca | 59 | 964 Turbo | Hurley Haywood | Brumos Motor Cars | 4th |
| 21.7.1991 | 500 mile Fuji | 92 | 962 C | Weaver / Haywood | Team Schuppan | DNA |
| 21.7.1991 | 500 mile Fuji | 100 | 962 C GTi | Fouché / Andskar | Nisseki Racing Team (Trust) | 5th |
| 27.7.1991 | IMSA Supercar Portland | 58 | 964 Turbo | Joe Varde | Brumos Motor Cars | 2nd |
| 27.7.1991 | IMSA Supercar Portland | 59 | 964 Turbo | Hurley Haywood | Brumos Motor Cars | 1st |
| 28.7.1991 | Interserie Brands Hatch | 5 | 962 C | Otto Altenbach | Obermaier Racing | 5th |
| 28.7.1991 | Interserie Brands Hatch | 6 | 962 C | Tim Lee-Davey | Team Davey | DNA |
| 28.7.1991 | Interserie Brands Hatch | 7 | 962 C | "John Winter" | Joest Porsche Racing | 2nd |
| 28.7.1991 | Interserie Brands Hatch | 8 | 962 C | Bernd Schneider | Joest Porsche Racing | 1st |
| 28.7.1991 | 300 km Portland | 16 | 962 C | James Weaver | Dyson Racing | 14th |
| 28.7.1991 | Interserie Brands Hatch | 18 | 962 C | Franz Konrad | Konrad Motorsport | DNA |
| 28.7.1991 | 1 h 30 min Portland [GT] | 26 | 911 | Joe Pezza | Alex Job Racing | 15th |
| 28.7.1991 | 300 km Portland | 30 | 962 C | Moretti / Bell | Momo/Joest Racing | 6th |
| 28.7.1991 | 1 h 30 min Portland [GT] | 57 | 911 Carrera | Monte Shelton | | 14th |
| 4.8.1991 | 24 h Spa | 15 | 964 Carrera 2 | Bobach / Bergmeister / Barth | Bergmeister Sport Langefeld | DNF |
| 4.8.1991 | 24 h Spa | 16 | 964 Carrera 2 | Memminger / Kyssmaul | Huber Motorsport | DNA |
| 4.8.1991 | 24 h Spa | 17 | 964 Carrera 2 | "Davit" / Grohs / Slaus | Porsche Belgium | 2nd |
| 4.8.1991 | 24 h Spa | 18 | 964 Carrera 2 | de Jamblinne / Neve / Libert | Porsche Belgium | 5th |
| 4.8.1991 | 24 h Spa | 19 | 964 Carrera 2 | Pirnay / Pensis / Lubin | Porsche Belgium | 4th |
| 4.8.1991 | 24 h Spa | 20 | 964 Carrera 2 | Leconte / Févrot / Camus | Jack Leconte | 7th |
| 4.8.1991 | 24 h Spa | 21 | 964 Carrera 2 | van Dalen / Neve / Bourgoignie | Porsche Belgium | DNF |
| 4.8.1991 | 24 h Spa | 22 | 964 Carrera 2 | von Gartzen / Grohs / Manthey | Goebel Sport | DNA |
| 4.8.1991 | 24 h Spa | 23 | 964 Carrera 2 | Visconti / McKay | Ecurie Bruxelloise | DNF |
| 4.8.1991 | 24 h Spa | 24 | 964 Carrera 2 | de Craene / Huysman / Raes | Philippe de Craene | DNF |
| 4.8.1991 | 24 h Spa | 27 | 964 Carrera 2 | van der Velden / van Vliet / Fittipaldi | Team Hezemans Rotax | DNF |
| 4.8.1991 | 24 h Spa | 28 | 964 Carrera 2 | Hezemans / Hin / Land | Team Hezemans Rotax | 3rd |
| 11.8.1991 | Interserie Most | 5 | 962 C | Otto Altenbach | Obermaier Racing | 5th |
| 11.8.1991 | Interserie Most | 6 | 962 C | Tim Lee-Davey | Team Davey | DNA |
| 11.8.1991 | Interserie Most | 7 | 962 C | "John Winter" | Joest Porsche Racing | 3rd |
| 11.8.1991 | Interserie Most | 8 | 962 C | Bernd Schneider | Joest Porsche Racing | 1st |
| 18.8.1991 | 430 km Nürburgring | 11 | 962 CK6 | Reuter / Toivonen | Porsche Kremer Racing | 3rd |
| 18.8.1991 | 430 km Nürburgring | 14 | 962 C | Salamin / Yver | Team Salamin Primagaz | NC |
| 18.8.1991 | 430 km Nürburgring | 16T | 962 C | | Brun Motorsport | unused |
| 18.8.1991 | 430 km Nürburgring | 17 | 962 C | Pareja / Brun | Repsol Brun Motorsport | 7th |
| 18.8.1991 | 430 km Nürburgring | 17T | 962 C | Pareja / Brun | Repsol Brun Motorsport | T-car |
| 18.8.1991 | 430 km Nürburgring | 55 | 962 CK6 | Rensing / Stermitz | Porsche Kremer Racing | 8th |
| 18.8.1991 | 430 km Nürburgring | 57 | 962 C | Becker / Konrad | Konrad Motorsport | 9th |
| 18.8.1991 | 430 km Nürburgring | 59 | 962 C | Oppermann / Altenbach | Team Salamin Primagaz (Obermaier Racing) | 4th |
| 25.8.1991 | 300 km Road America | 7 | 962 C | "Winter" / Schneider | Joest Racing | 6th |
| 25.8.1991 | 300 km Road America | 16 | 962 C | James Weaver | Dyson Racing | 18th |
| 25.8.1991 | 200 km Road America [GT] | 26 | 911 | Joe Pezza | Alex Job Racing | 32nd |
| 25.8.1991 | 300 km Road America | 30 | 962 C | Moretti / Bell | Momo-Gebhardt Racing | 14th |
| 25.8.1991 | 1000 km Suzuka | 91 | 962 C | Bailey / Acheson | Team 0123 | DNF |
| 25.8.1991 | 1000 km Suzuka | 100 | 962 C GTi | Fouché / Andskar | Nisseki Racing Team | 5th |
| 1.9.1991 | IMSA Supercar Road Atlanta | 57 | 964 Turbo | David Rocha | John Wood Porsche / WonderBread | 14th |
| 1.9.1991 | IMSA Supercar Road Atlanta | 58 | 964 Turbo | Hans-Joachim Stuck | Brumos Motor Cars | 3rd |
| 1.9.1991 | IMSA Supercar Road Atlanta | 59 | 964 Turbo | Hurley Haywood | Brumos Motor Cars | 2nd |
| 1.9.1991 | Road Atlanta [GT] | 89 | 911 | Ray Hendricks | Dynamic Air Cond. | 26th |
| 15.9.1991 | Interserie Siegerland | 5 | 962 C | Otto Altenbach | Obermaier Racing | DNA |
| 15.9.1991 | Interserie Siegerland | 6 | 962 C | Heinz-Jörgen Dahmen | Heinz-Jürgen Dahmen | 18th |
| 15.9.1991 | Interserie Siegerland | 7 | 962 C | "John Winter" | Joest Porsche Racing | 1st |
| 15.9.1991 | 500 km Sugo | 100 | 962 C GTi | Fouché / Andskar | Nisseki Racing Team | 4th |