| 7.4.1991 | 2 h Miami | 19 | SE90P | David Tennyson | David Tennyson Racing/Denon America | 24th |
| 7.4.1991 | 2 h Miami | 54 | SE89P | Knott / Swett | HDF Motorsports | 20th |
| 14.4.1991 | 430 km Suzuka | 8 | SE90C | Zwolsman / Euser | Euro Racing | 4th |
| 14.4.1991 | 430 km Suzuka | 8T | SE90C | Charles Zwolsman | Euro Racing | T-car |
| 14.4.1991 | Interserie Hockenheim | 11 | SE89C | Ranieri Randaccio | The Berkeley Team | 5th |
| 28.4.1991 | 300 km Road Atlanta | 4 | SE89P | Bonner | Tom Milner Racing | 17th |
| 28.4.1991 | 300 km Road Atlanta | 5 | SE89P | Purner | Tom Milner Racing | 19th |
| 28.4.1991 | 300 km Road Atlanta | 10 | SE90P | Hotchkis / Adams | Hotchkis Racing | 11th |
| 28.4.1991 | 300 km Road Atlanta | 18 | SE90P | Evans / Bobeda | Carlos Bobeda Racing | 15th |
| 28.4.1991 | 300 km Road Atlanta | 19 | SE90P | David Tennyson | David Tennyson Racing/Denon America | 20th |
| 28.4.1991 | 300 km Road Atlanta | 32 | SE90P | Perry McCarthy | Spice Engineering | 10th |
| 28.4.1991 | 300 km Road Atlanta | 48 | SE90P | Parker Johnstone | Comptech Racing | 9th |
| 28.4.1991 | 300 km Road Atlanta | 54 | SE89P | Fuller / Knott | HDF Motorsports | 14th |
| 28.4.1991 | 300 km Road Atlanta | 65 | SE89P | Tom Kendall | Jim Miller Racing | 7th |
| 5.5.1991 | 300 km Topeka | 4 | SE89P | Bonner / Kline | Tom Milner Racing | 6th |
| 5.5.1991 | 300 km Topeka | 5 | SE89P | Purner / McAdam | Tom Milner Racing | 14th |
| 5.5.1991 | 430 km Monza | 8 | SE90C | Euser / Zwolsman | Euro Racing | 4th |
| 5.5.1991 | 430 km Monza | 8T | SE90C | | Euro Racing | unused |
| 5.5.1991 | 300 km Topeka | 10 | SE90P | Cord / Adams | Hotchkis Racing | 8th |
| 5.5.1991 | 300 km Topeka | 18 | SE90P | Carlos Bobeda | Carlos Bobeda Racing | 12th |
| 5.5.1991 | 300 km Topeka | 48 | SE90P | Parker Johnstone | Comptech Racing | 10th |
| 5.5.1991 | 300 km Topeka | 54 | SE89P | Fuller / Knott | HDF Motorsports | 15th |
| 5.5.1991 | 300 km Topeka | 65 | SE89P | Kendall | Jim Miller Racing | 7th |
| 5.5.1991 | 1000 km Fuji | 77 | SE91C | Misaki / Yokoshima | Team Fedco | DNF |
| 12.5.1991 | Interserie Nürburgring Supersprint | 18 | SE90C | Charles Zwolsman | Euro Racing | 5th |
| 19.5.1991 | 430 km Silverstone | 8 | SE90C | Piper / Euser | Euro Racing | 5th |
| 19.5.1991 | 430 km Silverstone | 8T | SE90C | Piper / Euser | Euro Racing | T-car |
| 19.5.1991 | 430 km Silverstone | 60 | SE89C | Sheldon | Louis Descartes (Chamberlain Engineering) | DNS |
| 26.5.1991 | 2 h Lime Rock | 4 | SE89P | Bonner | Tom Milner Racing | 18th |
| 26.5.1991 | 2 h Lime Rock | 5 | SE89P | Purner / McAdam | Tom Milner Racing | 9th |
| 26.5.1991 | 2 h Lime Rock | 10 | SE90P | Hotchkis / Hotchkis, Jr. | Hotchkis Racing | 12th |
| 26.5.1991 | Interserie Zeltweg | 11 | SE89C | Ranieri Randaccio | The Berkeley Team | DNA |
| 26.5.1991 | Interserie Zeltweg | 18 | SE90C | Charles Zwolsman | Euro Racing | DNA |
| 26.5.1991 | 2 h Lime Rock | 19 | SE90P | Tennyson / Knott | David Tennyson Racing/Denon America | 10th |
| 26.5.1991 | 2 h Lime Rock | 48 | SE90P | Parker Johnstone | Comptech Racing | 16th |
| 26.5.1991 | 2 h Lime Rock | 54 | SE89P | Fuller / Allison | HDF Motorsports | 15th |
| 26.5.1991 | 2 h Lime Rock | 80 | SE89P | Melgrati / Finotto | Bieri Racing | 13th |
| 2.6.1991 | 300 km Mid-Ohio | 4 | SE89P | Bonner / Kline | Tom Milner Racing | 11th |
| 2.6.1991 | 300 km Mid-Ohio | 5 | SE89P | Purner / McAdam | Tom Milner Racing | 12th |
| 2.6.1991 | 300 km Mid-Ohio | 10 | SE90P | Adams / McCarthy | Hotchkis Racing | 9th |
| 2.6.1991 | 300 km Mid-Ohio | 18 | SE90P | Evans / Bobeda | Carlos Bobeda Racing | 16th |
| 2.6.1991 | 300 km Mid-Ohio | 19 | SE90P | David Tennyson | David Tennyson Racing/Denon America | 15th |
| 2.6.1991 | 300 km Mid-Ohio | 48 | SE90P | Parker Johnstone | Comptech Racing | 13th |
| 2.6.1991 | 300 km Mid-Ohio | 54 | SE89P | Fuller / Knott | HDF Motorsports | 18th |
| 2.6.1991 | 300 km Mid-Ohio | 80 | SE89P | Finotto / Melgrati | Bieri Racing | 17th |
| 16.6.1991 | 2 h New Orleans | 4 | SE89P | Bonner | Tom Milner Racing | 15th |
| 16.6.1991 | 2 h New Orleans | 5 | SE89P | Purner | Tom Milner Racing | 3rd |
| 16.6.1991 | 2 h New Orleans | 19 | SE90P | David Tennyson | David Tennyson Racing/Denon America | 5th |
| 16.6.1991 | 2 h New Orleans | 32 | SE89P | Knott / Velez | HDF Motorsports | 7th |
| 16.6.1991 | 2 h New Orleans | 33 | SE90P | Perry McCarthy | Spice Engineering | 14th |
| 16.6.1991 | 2 h New Orleans | 48 | SE90P | Parker Johnstone | Comptech Racing | 8th |
| 16.6.1991 | 2 h New Orleans | 54 | SE89P | Hugh Fuller | HDF Motorsports | 17th |
| 23.6.1991 | 24 h Le Mans | 8 | SE90C | Zwolsman / Euser / Harvey | Euro Racing | DNF |
| 23.6.1991 | 24 h Le Mans | 8T | SE90C | Zwolsman / Euser / Harvey | Euro Racing | T-car |
| 23.6.1991 | 24 h Le Mans | 38 | SE89C | Randaccio / Sebastiani / Savoldi | Louis Descartes (Berkeley Team London) | unused |
| 23.6.1991 | 24 h Le Mans | 39 | SE89C | Maisonneuve / Lapeyre / Grand | Louis Descartes (Graff Racing) | DNF |
| 23.6.1991 | 24 h Le Mans | 40 | SE90C | St. James / Wilson / Muller | Euro Racing (A.O. Racing) | T-car |
| 23.6.1991 | 24 h Le Mans | 40T | SE90C | Wilson / St. James / Muller | Euro Racing (A.O. Racing) | DNF |
| 23.6.1991 | 24 h Le Mans | 41 | SE90C | Nagasaka / Yokoshima / Misaki | Euro Racing (Team Fedco) | 12th |
| 23.6.1991 | 24 h Le Mans | 42 | SE88P | Bell | Euro Racing (Classic/TFR) | DNQ |
| 23.6.1991 | 24 h Le Mans | 43 | SE89C | Ricci / Iacobelli / Piper | Euro Racing (PC Automotive) | NC |
| 23.6.1991 | 24 h Le Mans | 44 | SE89C | Sheldon / de Lesseps / Rickett | Euro Racing (Chamberlain Engineering) | DNF |
| 23.6.1991 | 24 h Le Mans | 45 | SE89C | Adams / Jones / Donovan | Euro Racing (Chamberlain Engineering) | DNF |
| 30.6.1991 | 500 km Watkins Glen | 4 | SE89P | Bonner / Purner | Tom Milner Racing | 5th |
| 30.6.1991 | 500 km Watkins Glen | 5 | SE89P | Jeff Kline | Tom Milner Racing | 15th |
| 30.6.1991 | 500 km Watkins Glen | 10 | SE90P | Hotchkis / Adams | Hotchkis Racing | 21st |
| 30.6.1991 | 500 km Watkins Glen | 18 | SE90P | Evans / Fuller | Carlos Bobeda Racing | 12th |
| 30.6.1991 | 500 km Watkins Glen | 19 | SE90P | David Tennyson | David Tennyson Racing/Denon America | 9th |
| 30.6.1991 | 500 km Watkins Glen | 32 | SE89P | Knott / Velez | HDF Motorsports | 10th |
| 30.6.1991 | 500 km Watkins Glen | 48 | SE90P | Parker Johnstone | Comptech Racing | 7th |
| 30.6.1991 | 500 km Watkins Glen | 80 | SE89P | Finotto / Melgrati | Bieri Racing | 16th |
| 21.7.1991 | 300 km Laguna Seca | 4 | SE89P | Bonner / Purner | Tom Milner Racing | 14th |
| 21.7.1991 | 300 km Laguna Seca | 5 | SE89P | Kline | Tom Milner Racing | 17th |
| 21.7.1991 | 300 km Laguna Seca | 10 | SE90P | John Hotchkis, Jr. | Hotchkis Racing | 9th |
| 21.7.1991 | 300 km Laguna Seca | 19 | SE90P | David Tennyson | David Tennyson Racing/Denon America | 11th |
| 21.7.1991 | 300 km Laguna Seca | 32 | SE90P | Fuller / Debban | Carlos Bobeda Racing | 15th |
| 21.7.1991 | 300 km Laguna Seca | 33 | SE90P | Perry McCarthy | Spice Engineering | 3rd |
| 21.7.1991 | 300 km Laguna Seca | 48 | SE90P | Parker Johnstone | Comptech Racing | 16th |
| 21.7.1991 | 500 mile Fuji | 77 | SE91C | Misaki / Yokoshima | Team Fedco | 7th |
| 21.7.1991 | 300 km Laguna Seca | 80 | SE89P | Ruggero Melgrati | Bieri Racing | 10th |
| 28.7.1991 | 300 km Portland | 4 | SE89P | Bonner / Kline | Tom Milner Racing | 8th |
| 28.7.1991 | 300 km Portland | 5 | SE89P | McAdam | Tom Milner Racing | 16th |
| 28.7.1991 | 300 km Portland | 10 | SE90P | Adams | Hotchkis Racing | 17th |
| 28.7.1991 | 300 km Portland | 19 | SE90P | David Tennyson | David Tennyson Racing/Denon America | 12th |
| 28.7.1991 | 300 km Portland | 32 | SE90P | Debban / Fuller | Carlos Bobeda Racing | 15th |
| 28.7.1991 | 300 km Portland | 48 | SE90P | Parker Johnstone | Comptech Racing | 10th |
| 28.7.1991 | 300 km Portland | 80 | SE89P | Ruggero Melgrati | Bieri Racing | 9th |
| 11.8.1991 | Interserie Most | 18 | SE90C | Charles Zwolsman | Euro Racing | 4th |
| 18.8.1991 | 430 km Nürburgring | 7 | SE89C | Randaccio / Savoldi | Louis Descartes (Berkeley Team London) | DNF |
| 18.8.1991 | 430 km Nürburgring | 8 | SE90C | Euser / Zwolsman | Euro Racing | DNF |
| 18.8.1991 | 430 km Nürburgring | 8T | SE90C | Zwolsman / Euser | Euro Racing | T-car |
| 25.8.1991 | 300 km Road America | 4 | SE89P | Brian Bonner | Tom Milner Racing | 20th |
| 25.8.1991 | 300 km Road America | 5 | SE89P | Kline / McAdam | Tom Milner Racing | 17th |
| 25.8.1991 | 300 km Road America | 10 | SE90P | Hotchkis / Adams | Hotchkis Racing | 7th |
| 25.8.1991 | 300 km Road America | 19 | SE90P | David Tennyson | David Tennyson Racing/Denon America | 21st |
| 25.8.1991 | 300 km Road America | 48 | SE90P | Parker Johnstone | Comptech Racing | 12th |
| 25.8.1991 | 300 km Road America | 49 | SE91P | Dan Marvin | Comptech Racing | 9th |
| 25.8.1991 | 300 km Road America | 80 | SE89P | Finotto / Melgrati | Bieri Racing | 11th |
| 15.9.1991 | 500 km Sugo | 21 | SE90C | Fukuyama / Yoshikawa / Matsuda | Aoshima Tsunemasa | 8th |
| 15.9.1991 | 500 km Sugo | 77 | SE91C | Misaki / Yokoshima | Team Fedco | unused |