| «1991-13» | Portugal Grand Prix - XX Grande Premio de Portugal |
| 1991-09-22 | Estoril - Autódromo Fernanda Pires da Silva - 71 laps × 4.35 km : 308.85 km |
| Pos | Grid | Car | Driver | Constructor | Q1 | Q2 | Best | Gap | Interval |
|---|---|---|---|---|---|---|---|---|---|
| 1 | 1 | 6 | Riccardo Patrese | Williams • Renault | 01:14.041 | 01:13.001 | 01:13.001 | 214.518 km/h | |
| 2 | 2 | 2 | Gerhard Berger | McLaren • Honda | 01:13.221 | 01:13.430 | 01:13.221 | +00.220 (+0.301%) | +00.220 |
| 3 | 3 | 1 | Ayrton Senna | McLaren • Honda | 01:13.752 | 01:13.444 | 01:13.444 | +00.443 (+0.607%) | +00.223 |
| 4 | 4 | 5 | Nigel Mansell | Williams • Renault | 01:13.944 | 01:13.667 | 01:13.667 | +00.666 (+0.912%) | +00.223 |
| 5 | 5 | 27 | Alain Prost | Ferrari | 01:15.018 | 01:14.352 | 01:14.352 | +01.351 (+1.851%) | +00.685 |
| 6 | 6 | 28 | Jean Alesi | Ferrari | 01:15.572 | 01:14.852 | 01:14.852 | +01.851 (+2.536%) | +00.500 |
| 7 | 7 | 15 | Mauricio Gugelmin | Leyton House • Ilmor | 01:17.214 | 01:15.266 | 01:15.266 | +02.265 (+3.103%) | +00.414 |
| 8 | 8 | 23 | Pierluigi Martini | Minardi • Ferrari | 01:15.394 | 01:16.982 | 01:15.394 | +02.393 (+3.278%) | +00.128 |
| 9 | 9 | 16 | Ivan Capelli | Leyton House • Ilmor | 01:15.481 | 01:15.827 | 01:15.481 | +02.480 (+3.397%) | +00.087 |
| 10 | 10 | 19 | Michael Schumacher | Benetton • Ford Cosworth | 01:16.477 | 01:15.578 | 01:15.578 | +02.577 (+3.530%) | +00.097 |
| 11 | 11 | 20 | Nelson Piquet | Benetton • Ford Cosworth | 01:16.241 | 01:15.666 | 01:15.666 | +02.665 (+3.651%) | +00.088 |
| 12 | 12 | 4 | Stefano Modena | Tyrrell • Honda | 01:16.018 | 01:15.707 | 01:15.707 | +02.706 (+3.707%) | +00.041 |
| 13 | 13 | 24 | Gianni Morbidelli | Minardi • Ferrari | 01:16.540 | 01:15.749 | 01:15.749 | +02.748 (+3.764%) | +00.042 |
| 14 | 14 | 33 | Andrea de Cesaris | Jordan • Ford Cosworth | 01:15.972 | 01:15.936 | 01:15.936 | +02.935 (+4.020%) | +00.187 |
| 15 | 15 | 8 | Mark Blundell | Brabham • Yamaha | 01:16.567 | 01:16.038 | 01:16.038 | +03.037 (+4.160%) | +00.102 |
| 16 | 16 | 32 | Roberto Moreno | Jordan • Ford Cosworth | 01:16.956 | 01:16.080 | 01:16.080 | +03.079 (+4.218%) | +00.042 |
| 17 | 17 | 21 | Emanuele Pirro | Dallara • Judd | 01:16.725 | 01:16.135 | 01:16.135 | +03.134 (+4.293%) | +00.055 |
| 18 | 18 | 22 | JJ Lehto | Dallara • Judd | 01:16.724 | 01:16.532 | 01:16.532 | +03.531 (+4.837%) | +00.397 |
| 19 | 19 | 7 | Martin Brundle | Brabham • Yamaha | 01:17.298 | 01:16.536 | 01:16.536 | +03.535 (+4.842%) | +00.004 |
| 20 | 20 | 25 | Thierry Boutsen | Ligier • Lamborghini | 01:18.005 | 01:16.757 | 01:16.757 | +03.756 (+5.145%) | +00.221 |
| 21 | 21 | 3 | Satoru Nakajima | Tyrrell • Honda | 01:16.926 | 01:17.035 | 01:16.926 | +03.925 (+5.377%) | +00.169 |
| 22 | 22 | 12 | Johnny Herbert | Lotus • Judd | 01:17.713 | 01:17.015 | 01:17.015 | +04.014 (+5.499%) | +00.089 |
| 23 | 23 | 26 | Erik Comas | Ligier • Lamborghini | 01:18.192 | 01:17.226 | 01:17.226 | +04.225 (+5.788%) | +00.211 |
| 24 | 24 | 9 | Michele Alboreto | Footwork • Ford Cosworth | 01:18.389 | 01:17.330 | 01:17.330 | +04.329 (+5.930%) | +00.104 |
| 25 | 25 | 30 | Aguri Suzuki | Lola • Ford Cosworth | 01:17.434 | 01:17.537 | 01:17.434 | +04.433 (+6.073%) | +00.104 |
| 26 | 26 | 11 | Mika Hakkinen | Lotus • Judd | 01:18.947 | 01:17.714 | 01:17.714 | +04.713 (+6.456%) | +00.280 |
| 27 | 29 | Eric Bernard | Lola • Ford Cosworth | 01:18.186 | 01:17.825 | 01:17.825 | +04.824 (+6.608%) | +00.111 | |
| 28 | 17 | Gabriele Tarquini | AGS • Ford Cosworth | 01:18.295 | 01:18.022 | 01:18.022 | +05.021 (+6.878%) | +00.197 | |
| 29 | 34 | Nicola Larini | Lamborghini | 01:21.612 | 01:18.139 | 01:18.139 | +05.138 (+7.038%) | +00.117 | |
| 30 | 35 | Eric van de Poele | Lamborghini | 01:20.411 | 01:18.266 | 01:18.266 | +05.265 (+7.212%) | +00.127 | |
| 31 | 18 | Fabrizio Barbazza | AGS • Ford Cosworth | 01:19.292 | 01:19.292 | +06.291 (+8.618%) | +01.026 | ||
| 32 | 14 | Olivier Grouillard | Fondmetal • Ford Cosworth | 01:19.500 | 01:19.500 | +06.499 (+8.903%) | +00.208 | ||
| 33 | 10 | Alex Caffi | Footwork • Ford Cosworth | 01:19.521 | 01:19.521 | +06.520 (+8.931%) | +00.021 | ||
| 34 | 31 | Pedro Chaves | Coloni • Ford Cosworth | 01:23.858 | 01:23.858 | +10.857 (+14.872%) | +04.337 |