# 1991 All Japan Sports Prototype Car Endurance Championship

The 1991 All Japan Sports Prototype Car Endurance Championship was the ninth season of the All Japan Sports Prototype Championship. The 1991 champion was the #23 Nissan Motorsports Nissan R91CP driven by Kazuyoshi Hoshino and Toshio Suzuki.

## Schedule

All races were held in Japan.
| Round | Race | Circuit | Date |
| 1 | All Japan Fuji 500 km | Fuji Speedway | 10 March |
| 2 | All Japan Fuji 1000 km | Fuji Speedway | 5 May |
| 3 | All Japan Fuji 500 Miles | Fuji Speedway | 21 July |
| 4 | International Suzuka 1000 km | Suzuka Circuit | 25 August |
| 5 | SUGO Inter 500 km | Sportsland SUGO | 16 September |
| 6 | Interchallenge Fuji 1000 km | Fuji Speedway | 6 October |
| 7 | SUGO Inter 500 Miles | Sportsland SUGO | 3 November |

## Entry list

| Team | Make | Car | Engine | No. | Drivers | Tyre | Rounds |
| Nissan Motorsports | Nissan | Nissan R90CP Nissan R91CP | Nissan VRH35Z 3.5 L Twin Turbo V8 | 1 | Masahiro Hasemi | B | All |
| Nissan Motorsports | Nissan | Nissan R90CP Nissan R91CP | Nissan VRH35Z 3.5 L Twin Turbo V8 | 1 | Anders Olofsson | B | All |
| Nissan Motorsports | Nissan | Nissan R90CP Nissan R91CP | Nissan VRH35Z 3.5 L Twin Turbo V8 | 23 | Kazuyoshi Hoshino | B | All |
| Nissan Motorsports | Nissan | Nissan R90CP Nissan R91CP | Nissan VRH35Z 3.5 L Twin Turbo V8 | 23 | Toshio Suzuki | B | All |
| Team Taisan | Porsche | Porsche 962C | Porsche 935/82 3.0 L Twin Turbo F6 | 2 | Kunimitsu Takahashi | Y | 1–2 |
| Team Taisan | Porsche | Porsche 962C | Porsche 935/82 3.0 L Twin Turbo F6 | 2 | Stanley Dickens | Y | 1–2 |
| Team Taisan | Porsche | Porsche 962C | Porsche 935/82 3.0 L Twin Turbo F6 | 2 | Will Hoy | Y | 2 |
| Team Taisan | Porsche | Porsche 962C | Porsche 962/83 3.2 L Twin Turbo F6 | 3 | Will Hoy | Y | 1 |
| Team Taisan | Porsche | Porsche 962C | Porsche 962/83 3.2 L Twin Turbo F6 | 3 | Harald Huysman | Y | 1 |
| Navi Connection Racing | Alexel | Alexel Autorama C91 | Ford DFR 3.5 L V8 | 3 | Kaoru Iida | D | 5–7 |
| Navi Connection Racing | Alexel | Alexel Autorama C91 | Ford DFR 3.5 L V8 | 3 | Taku Akaike | D | 5–7 |
| The Alpha Racing | Porsche | Porsche 962C | Porsche 962/83 3.2 L Twin Turbo F6 | 7 | Tiff Needell | Y | 1–3 |
| The Alpha Racing | Porsche | Porsche 962C | Porsche 962/83 3.2 L Twin Turbo F6 | 7 | Anthony Reid | Y | 1–3 |
| The Alpha Racing | Porsche | Porsche 962C | Porsche 962/83 3.2 L Twin Turbo F6 | 7 | Raul Boesel | Y | 6 |
| The Alpha Racing | Porsche | Porsche 962C | Porsche 962/83 3.2 L Twin Turbo F6 | 7 | Bob Wollek | Y | 6 |
| The Alpha Racing | Porsche | Porsche 962C | Porsche 962/83 3.2 L Twin Turbo F6 | 7 | Jonathan Palmer | Y | 7 |
| The Alpha Racing | Porsche | Porsche 962C | Porsche 962/83 3.2 L Twin Turbo F6 | 7 | Oscar Larrauri | Y | 7 |
| TWR Suntec Jaguar | Jaguar | Jaguar XJR-11 | Rover V64V 3.5 L Twin Turbo V6 | 18 | Mauro Martini | G | 2–6 |
| TWR Suntec Jaguar | Jaguar | Jaguar XJR-11 | Rover V64V 3.5 L Twin Turbo V6 | 18 | Jeff Krosnoff | G | 2–6 |
| TWR Suntec Jaguar | Jaguar | Jaguar XJR-11 | Rover V64V 3.5 L Twin Turbo V6 | 18 | John Nielsen | G | 3–4 |
| TWR Suntec Jaguar | Jaguar | Jaguar XJR-14 | Cosworth HB 3.5 L V8 | 18 | Mauro Martini | G | 7 |
| TWR Suntec Jaguar | Jaguar | Jaguar XJR-14 | Cosworth HB 3.5 L V8 | 18 | Jeff Krosnoff | G | 7 |
| TWR Suntec Jaguar | Jaguar | Jaguar XJR-14 | Cosworth HB 3.5 L V8 | 17 | David Brabham | G | 7 |
| TWR Suntec Jaguar | Jaguar | Jaguar XJR-14 | Cosworth HB 3.5 L V8 | 17 | Teo Fabi | G | 7 |
| Ao Racing | Spice | Spice SE90C | Ford DFZ 3.5 L V8 | 21 | Hideshi Matsuda | D | 5–6 |
| Ao Racing | Spice | Spice SE90C | Ford DFZ 3.5 L V8 | 21 | Hideo Fukuyama | D | 5–6 |
| Ao Racing | Spice | Spice SE90C | Ford DFZ 3.5 L V8 | 21 | Tomiko Yoshikawa | D | 6 |
| Team LeMans | Nissan | Nissan R90C Nissan R91CP | Nissan VRH35Z 3.5 L Twin Turbo V8 | 25 | Hideki Okada | Y | All |
| Team LeMans | Nissan | Nissan R90C Nissan R91CP | Nissan VRH35Z 3.5 L Twin Turbo V8 | 25 | Takao Wada | Y | 1–4 |
| Team LeMans | Nissan | Nissan R90C Nissan R91CP | Nissan VRH35Z 3.5 L Twin Turbo V8 | 25 | Masahiko Kageyama | Y | 3–7 |
| Team LeMans | Nissan | Nissan R90C Nissan R91CP | Nissan VRH35Z 3.5 L Twin Turbo V8 | 25 | Maurizio Sandro Sala | Y | 4 |
| From A Racing | Nissan | Nissan R90CK | Nissan VRH35Z 3.5 L Twin Turbo V8 | 27 | Akihiko Nakaya | B | All |
| From A Racing | Nissan | Nissan R90CK | Nissan VRH35Z 3.5 L Twin Turbo V8 | 27 | Volker Weidler | B | All |
| From A Racing | Nissan | Nissan R90CK | Nissan VRH35Z 3.5 L Twin Turbo V8 | 27 | Thomas Danielsson | B | 2 |
| Toyota Team TOM'S | Toyota | Toyota 90C-V Toyota 91C-V | Toyota R36V 3.6 L Turbo V8 | 36 | Masanori Sekiya | B | All |
| Toyota Team TOM'S | Toyota | Toyota 90C-V Toyota 91C-V | Toyota R36V 3.6 L Turbo V8 | 36 | Hitoshi Ogawa | B | All |
| Toyota Team TOM'S | Toyota | Toyota 90C-V Toyota 91C-V | Toyota R36V 3.6 L Turbo V8 | 36 | Andy Wallace | B | 2, 4 |
| Toyota Team TOM'S | Toyota | Toyota 90C-V Toyota 91C-V | Toyota R36V 3.6 L Turbo V8 | 37 | Geoff Lees | B | All |
| Toyota Team TOM'S | Toyota | Toyota 90C-V Toyota 91C-V | Toyota R36V 3.6 L Turbo V8 | 37 | Eje Elgh | B | 2–7 |
| Toyota Team TOM'S | Toyota | Toyota 90C-V Toyota 91C-V | Toyota R36V 3.6 L Turbo V8 | 37 | Pierre-Henri Raphanel | B | 1 |
| Toyota Team TOM'S | Toyota | Toyota 90C-V Toyota 91C-V | Toyota R36V 3.6 L Turbo V8 | 37 | Andy Wallace | B | 4, 6 |
| Toyota Team SARD | Toyota | Toyota 90C-V Toyota 91C-V | Toyota R36V 3.6 L Turbo V8 | 38 | Roland Ratzenberger | D | All |
| Toyota Team SARD | Toyota | Toyota 90C-V Toyota 91C-V | Toyota R36V 3.6 L Turbo V8 | 38 | Naoki Nagasaka | D | 1–4 |
| Toyota Team SARD | Toyota | Toyota 90C-V Toyota 91C-V | Toyota R36V 3.6 L Turbo V8 | 38 | Pierre-Henri Raphanel | D | 3–7 |
| Team Fedco | Spice | Spice SE91C | Ford DFZ 3.5 L V8 | 77 | Hisashi Yokoshima | G | 2–3 |
| Team Fedco | Spice | Spice SE91C | Ford DFZ 3.5 L V8 | 77 | Kiyoshi Misaki | G | 2–3 |
| Team Schuppan | Porsche | Porsche 962C | Porsche 962/83 3.0 L Twin Turbo F6 | 91 | Hurley Haywood | D | 1 |
| Team Schuppan | Porsche | Porsche 962C | Porsche 962/83 3.0 L Twin Turbo F6 | 91 | James Weaver | D | 1 |
| Team 0123 | Porsche | Porsche 962C | Porsche 935/83 3.0 L Twin Turbo F6 | 91 | Julian Bailey | D | 4 |
| Team 0123 | Porsche | Porsche 962C | Porsche 935/83 3.0 L Twin Turbo F6 | 91 | Kenny Acheson | D | 4, 6 |
| Team 0123 | Porsche | Porsche 962C | Porsche 935/83 3.0 L Twin Turbo F6 | 91 | James Weaver | D | 6 |
| Trust Racing | Porsche | Porsche 962C | Porsche 935/83 3.0 L Twin Turbo F6 | 100 | George Fouché | D | All |
| Trust Racing | Porsche | Porsche 962C | Porsche 935/83 3.0 L Twin Turbo F6 | 100 | Steven Andskär | D | All |
| Mazdaspeed | Mazda | Mazda 787 Mazda 787B | Mazda R26B 2.6 L 4-rotor | 201 | Tetsuya Ota | D | 1 |
| Mazdaspeed | Mazda | Mazda 787 Mazda 787B | Mazda R26B 2.6 L 4-rotor | 201 | Pierre Dieudonné | D | 1, 7 |
| Mazdaspeed | Mazda | Mazda 787 Mazda 787B | Mazda R26B 2.6 L 4-rotor | 201 | David Kennedy | D | 1–2, 4–5 |
| Mazdaspeed | Mazda | Mazda 787 Mazda 787B | Mazda R26B 2.6 L 4-rotor | 201 | Johnny Herbert | D | 3, 6 |
| Mazdaspeed | Mazda | Mazda 787 Mazda 787B | Mazda R26B 2.6 L 4-rotor | 201 | Bertrand Gachot | D | 3 |
| Mazdaspeed | Mazda | Mazda 787 Mazda 787B | Mazda R26B 2.6 L 4-rotor | 201 | Yojiro Terada | D | 4–5, 7 |
| Mazdaspeed | Mazda | Mazda 787 Mazda 787B | Mazda R26B 2.6 L 4-rotor | 201 | Takashi Yorino | D | 4 |
| Mazdaspeed | Mazda | Mazda 787 Mazda 787B | Mazda R26B 2.6 L 4-rotor | 201 | Maurizio Sandro Sala | D | 6 |
| Mazdaspeed | Mazda | Mazda 787 Mazda 787B | Mazda R26B 2.6 L 4-rotor | 202 | Takashi Yorino | D | 1–3, 5–7 |
| Mazdaspeed | Mazda | Mazda 787 Mazda 787B | Mazda R26B 2.6 L 4-rotor | 202 | Yojiro Terada | D | 1–3 |
| Mazdaspeed | Mazda | Mazda 787 Mazda 787B | Mazda R26B 2.6 L 4-rotor | 202 | Tetsuya Ota | D | 2, 5 |
| Mazdaspeed | Mazda | Mazda 787 Mazda 787B | Mazda R26B 2.6 L 4-rotor | 202 | David Kennedy | D | 6–7 |
| Pleasure Racing | Mazda | Mazda 767B | Mazda RE13J 2.6 L 4-rotor | 230 | Tetsuji Shiratori | D | All |
| Pleasure Racing | Mazda | Mazda 767B | Mazda RE13J 2.6 L 4-rotor | 230 | Shuji Fujii | D | All |
| Pleasure Racing | Mazda | Mazda 767B | Mazda RE13J 2.6 L 4-rotor | 230 | Masatomo Shimizu | D | 1–6 |

## Season results

Season results as follows:
| Round | Circuit | Winning Team |
| Round | Circuit | Winning Drivers |
| 1 | Mt. Fuji | #23 Nissan Motorsports Nissan R91CP |
| 1 | Mt. Fuji | Kazuyoshi Hoshino Toshio Suzuki |
| 2 | Mt. Fuji Report | #23 Nissan Motorsports Nissan R91CP |
| 2 | Mt. Fuji Report | Kazuyoshi Hoshino Toshio Suzuki |
| 3 | Mt. Fuji | #36 Toyota Team TOM'S Toyota 91C-V |
| 3 | Mt. Fuji | Hitoshi Ogawa Masanori Sekiya |
| 4 | Suzuka Circuit Report | #38 Toyota Team SARD Toyota 91C-V |
| 4 | Suzuka Circuit Report | Roland Ratzenberger Pierre-Henri Raphanel Naoki Nagasaka |
| 5 | Sportsland SUGO Report | #37 Toyota Team TOM'S Toyota 91C-V |
| 5 | Sportsland SUGO Report | Geoff Lees Eje Elgh |
| 6 | Mt. Fuji | #23 Nissan Motorsports Nissan R91CP |
| 6 | Mt. Fuji | Kazuyoshi Hoshino Toshio Suzuki |
| 7 | Sportsland SUGO | #17 TWR Suntech Jaguar XJR-14 |
| 7 | Sportsland SUGO | David Brabham Teo Fabi |

## Point Ranking
### Drivers

| Rank | Drivers | Number/Team | Points | Wins |
| 1 | Kazuyoshi Hoshino Toshio Suzuki | #23 Nissan Motorsports Nissan R91CP | 87 | 3 |
| 2 | Hitoshi Ogawa Masanori Sekiya | #36 Toyota Team TOM'S Toyota 91C-V | 85 | 1 |
| 3 | Geoff Lees | #37 Toyota Team TOM'S Toyota 91C-V | 54 | 1 |
| 4 | Volker Weidler Akihiko Nakaya | #27 From A Racing Nissan R90CK | 52 | 0 |
| 5 | George Fouché Steven Andskär | #100 Trust Racing Porsche 962C | 52 | 0 |