| 3.2.1991 | 24 h Daytona | 72 | 911 | Volk / Kjoller / Mooney | Jay Kjoller Motorsports | 23rd |
| 3.3.1991 | 2 h West Palm Beach | 6 | 962 C | Wollek / Schneider | Joest Racing | 18th |
| 3.3.1991 | 2 h West Palm Beach | 7 | 962 C | "Winter" / Sigala / Wollek | Joest Racing | 7th |
| 3.3.1991 | 2 h West Palm Beach | 10T | 962 | Jim Adams | Hotchkis Racing | T-car |
| 3.3.1991 | 2 h West Palm Beach | 30 | 962 C | Moretti / Coppelli | Momo/Gebhardt Racing | 17th |
| 10.3.1991 | 500 km Fuji | 2 | 962 C | Takahashi / Dickens | Team Taisan Klepper | 5th |
| 10.3.1991 | 500 km Fuji | 3 | 962 C | Hoy / Huysman | Team Taisan Klepper | 10th |
| 10.3.1991 | 500 km Fuji | 7 | 962 C | Needell / Reid | The Alpha Racing | 8th |
| 10.3.1991 | 500 km Fuji | 92 | 962 C | Weaver / Haywood | Team Schuppan | 13th |
| 10.3.1991 | 500 km Fuji | 100 | 962 C GTi | Fouché / Andskar | Nisseki Racing Team | 7th |
| 16.3.1991 | 12 h Sebring | 6 | 962 C | Wollek / Schneider / Sigala | Joest Porsche Racing | 3rd |
| 16.3.1991 | 12 h Sebring | 7 | 962 C | Jelinski / Pescarolo / "Winter" | Joest Porsche Racing | 4th |
| 16.3.1991 | 12 h Sebring | 16 | 962 C | Dyson / Weaver / Paul, Jr. | Dyson Racing | DNA |
| 16.3.1991 | 12 h Sebring | 21 | 962 | Herzog / Haywood | Alucraft | 42nd |
| 16.3.1991 | 12 h Sebring | 24 | 962 GTi | Weaver / Paul, Jr. | Shapiro Motorsports | 25th |
| 16.3.1991 | 12 h Sebring | 26 | 911 | Job / Kraft / Refenning | Alex Job Racing | 20th |
| 16.3.1991 | 12 h Sebring | 30 | 962 C | Moretti / Mundas / Dickens | Momo/Gebhardt Racing | 10th |
| 16.3.1991 | 12 h Sebring | 72 | 911 | Kjoller / Mooney / Volk | Jay Kjoller Motorsports | 37th |
| 6.4.1991 | 1 h Miami [GT] | 26 | 911 | Joe Pezza | Alex Job Racing | 16th |
| 7.4.1991 | 2 h Miami | 6 | 962 C | Schneider / Wollek | Joest Porsche Racing | DNS |
| 7.4.1991 | 2 h Miami | 7 | 962 C | Bernd Schneider | Joest Porsche Racing | 6th |
| 7.4.1991 | 2 h Miami | 16 | 962 C | James Weaver | Dyson Racing | 4th |
| 7.4.1991 | 2 h Miami | 30 | 962 C | Moretti / Bell | Momo/Gebhardt | 7th |
| 13.4.1991 | 1 h Long Beach [GT] | 93 | 930 | Milt Minter | Oest Enterprises Racing | 27th |
| 14.4.1991 | Interserie Hockenheim | 5 | 962 C | Otto Altenbach | Obermaier Racing | 3rd |
| 14.4.1991 | Interserie Hockenheim | 7 | 962 C | "John Winter" | Joest Porsche Racing | 2nd |
| 14.4.1991 | Interserie Hockenheim | 8 | 962 C | Bernd Schneider | Joest Porsche Racing | 1st |
| 14.4.1991 | 430 km Suzuka | 11 | 962 CK6 | Reuter / Toivonen | Porsche Kremer Racing | 3rd |
| 14.4.1991 | 430 km Suzuka | 12 | 962 C | Fouché / Andskar | Courage Competition (Trust) | 5th |
| 14.4.1991 | 430 km Suzuka | 13 | 962 C GTi | Barilla / Elgh | Courage Competition (Nisseki Racing Team) | 8th |
| 14.4.1991 | 430 km Suzuka | 14 | 962 C | Cohen-Olivar / Salamin | Team Salamin Primagaz | 9th |
| 14.4.1991 | 430 km Suzuka | 16 | 962 C | Larrauri | Repsol Brun Motorsport | DQ |
| 14.4.1991 | 430 km Suzuka | 17 | 962 C | Sigala / Pareja | Repsol Brun Motorsport | 7th |
| 14.4.1991 | 430 km Suzuka | 19 | 962 C | Wilson / Lee-Davey | Team Davey | DNA |
| 14.4.1991 | 430 km Suzuka | 20 | 962 C | Gabbiani / Langes | Team Davey | DNA |
| 14.4.1991 | Interserie Hockenheim | 30 | 962 C | Günther Gebhardt | Gebhardt Racing | 4th |
| 28.4.1991 | 300 km Road Atlanta | 6 | 962 C | Bob Wollek | Joest Porsche Racing | DNA |
| 28.4.1991 | 300 km Road Atlanta | 7 | 962 C | "Winter" / Schneider | Joest Porsche Racing | 8th |
| 28.4.1991 | 300 km Road Atlanta | 16 | 962 C | Weaver | Dyson Racing | 6th |
| 28.4.1991 | 300 km Road Atlanta | 30 | 962 C | Moretti / Bell | Momo | 5th |
| 5.5.1991 | 1000 km Fuji | 2 | 962 C | Takahashi / Dickens / Hoy | Team Taisan Klepper | DNF |
| 5.5.1991 | 1000 km Fuji | 2T | 962 C | Takahashi / Dickens / Hoy | Team Taisan Klepper | T-car |
| 5.5.1991 | 1000 km Fuji | 7 | 962 C | Needell / Reid | The Alpha Racing | 7th |
| 5.5.1991 | 430 km Monza | 11 | 962 CK6 | Reuter / Toivonen | Porsche-Kremer-Racing | 5th |
| 5.5.1991 | 430 km Monza | 14 | 962 C | Cohen-Olivar / Salamin | Team Salamin Primagaz | DNF |
| 5.5.1991 | 430 km Monza | 16 | 962 C | Larrauri / Sigala | Repsol Brun Motorsport | 6th |
| 5.5.1991 | 430 km Monza | 17 | 962 C | Pareja / Brun | Repsol Brun Motorsport | DNF |
| 5.5.1991 | 430 km Monza | 19 | 962 C | Tim Lee-Davey | Team Davey | DNA |
| 5.5.1991 | 430 km Monza | 20 | 962 C | | Team Davey | DNA |
| 5.5.1991 | 430 km Monza | 21 | 962 C | Johansson / Konrad | Konrad-Motorsport | DNF |
| 5.5.1991 | 1000 km Fuji | 92 | 962 C | Weaver / Haywood | Team Schuppan | DNA |
| 5.5.1991 | 1000 km Fuji | 100 | 962 C GTi | Fouché / Andskar | Nisseki Racing Team | 4th |
| 12.5.1991 | Interserie Nürburgring Supersprint | 1 | 962 CK6 | Manuel Reuter | Porsche Kremer Racing | 2nd |
| 12.5.1991 | Interserie Nürburgring Supersprint | 4 | 962 C | Jürgen Oppermann | Obermaier Racing | DNS |
| 12.5.1991 | Interserie Nürburgring Supersprint | 5 | 962 C | Jürgen Oppermann | Obermaier Racing | DNS |
| 12.5.1991 | Interserie Nürburgring Supersprint | 5 | 962 C | Otto Altenbach | Obermaier Racing | 7th |
| 12.5.1991 | Interserie Nürburgring Supersprint | 6 | 962 C | Heinz-Jörgen Dahmen | Heinz-Jorgen Dahmen | 6th |
| 12.5.1991 | Interserie Nürburgring Supersprint | 7 | 962 C | "John Winter" | Joest Porsche Racing | 3rd |
| 12.5.1991 | Interserie Nürburgring Supersprint | 8 | 962 C | Bernd Schneider | Joest Porsche Racing | 1st |
| 12.5.1991 | Interserie Nürburgring Supersprint | 21 | 962 C | Franz Konrad | Alucraft Racing | 4th |
| 19.5.1991 | 430 km Silverstone | 11 | 962 CK6 | Reuter / Toivonen | Porsche Kremer Racing | 8th |
| 19.5.1991 | 430 km Silverstone | 11T | 962 CK6 | Manuel Reuter | Porsche Kremer Racing | T-car |
| 19.5.1991 | 430 km Silverstone | 14 | 962 C | Salamin / Cohen-Olivar | Team Salamin Primagaz | NC |
| 19.5.1991 | 430 km Silverstone | 16 | 962 C | Larrauri / Pareja | Repsol Brun Motorsport | 7th |
| 19.5.1991 | 430 km Silverstone | 17 | 962 C | Sigala / Brun | Repsol Brun Motorsport | 10th |
| 19.5.1991 | 430 km Silverstone | 21 | 962 C | Konrad / Needell | Konrad Motorsport | DNF |
| 19.5.1991 | 430 km Silverstone | 59 | 962 C | Palmer / Elgh | Team Salamin Primagaz (Team Schuppan) | DNF |
| 20.5.1991 | 300 km Mosport [GT] | 50 | 911 | Brezinka / Bartling | | 7th |
| 20.5.1991 | 300 km Mosport [GT] | 89 | 911 | Ray Hendricks | Dynamic Air Cond. | 13th |
| 26.5.1991 | Interserie Zeltweg | 1 | 962 CK6 | Manuel Reuter | Porsche Kremer Racing | 3rd |
| 26.5.1991 | Interserie Zeltweg | 4 | 962 C | Jürgen Oppermann | Obermaier Racing | 6th |
| 26.5.1991 | Interserie Zeltweg | 5 | 962 C | Otto Altenbach | Obermaier Racing | DNF |
| 26.5.1991 | Interserie Zeltweg | 6 | 962 C | Heinz-Jörgen Dahmen | Heinz-Jürgen Dahmen | DNF |
| 26.5.1991 | Interserie Zeltweg | 7 | 962 C | "John Winter" | Joest Porsche Racing | 2nd |
| 26.5.1991 | Interserie Zeltweg | 8 | 962 C | Bernd Schneider | Joest Porsche Racing | 1st |
| 26.5.1991 | 2 h Lime Rock | 16 | 962 C | Dyson / Weaver | Dyson Racing | 17th |
| 26.5.1991 | Interserie Zeltweg | 18 | 962 C | Franz Konrad | Konrad Motorsport | 4th |
| 26.5.1991 | Interserie Zeltweg | 111 | 962 CK6 | Jürgen Barth | Porsche Kremer Racing | DNS |
| 27.5.1991 | IMSA Supercar Lime Rock | 59 | 964 Turbo | Hurley Haywood | Brumos Motor Cars | 7th |
| 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 | 14 | 962 C | Salamin / Cohen-Olivar / Tarrès | Team Salamin Primagaz | DNF |
| 23.6.1991 | 24 h Le Mans | | 962 C | Franz Konrad | Konrad Motorsport | DNA |