| «1985-06» | USA Grand Prix - IV Detroit Grand Prix |
| 1985-06-23 | Detroit - 63 laps × 4.023 km : 253.449 km |
| Pos | Grid | Car | Driver | Constructor | Q1 | Q2 | Best | Gap | Interval |
|---|---|---|---|---|---|---|---|---|---|
| 1 | 1 | 12 | Ayrton Senna | Lotus • Renault | 01:42.051 | 01:42.051 | 141.917 km/h | ||
| 2 | 2 | 5 | Nigel Mansell | Williams • Honda | 01:43.249 | 01:43.249 | +01.198 (+1.174%) | +01.198 | |
| 3 | 3 | 27 | Michele Alboreto | Ferrari | 01:43.748 | 01:43.748 | +01.697 (+1.663%) | +00.499 | |
| 4 | 4 | 2 | Alain Prost | McLaren • TAG Porsche | 01:44.088 | 01:44.088 | +02.037 (+1.996%) | +00.340 | |
| 5 | 5 | 6 | Keke Rosberg | Williams • Honda | 01:44.156 | 01:44.156 | +02.105 (+2.063%) | +00.068 | |
| 6 | 6 | 16 | Derek Warwick | Renault | 01:44.163 | 01:44.163 | +02.112 (+2.070%) | +00.007 | |
| 7 | 7 | 23 | Eddie Cheever | Alfa Romeo | 01:44.231 | 02:05.540 | 01:44.231 | +02.180 (+2.136%) | +00.068 |
| 8 | 8 | 11 | Elio de Angelis | Lotus • Renault | 01:44.769 | 01:44.769 | +02.718 (+2.663%) | +00.538 | |
| 9 | 9 | 28 | Stefan Johansson | Ferrari | 01:44.921 | 01:44.921 | +02.870 (+2.812%) | +00.152 | |
| 10 | 10 | 7 | Nelson Piquet | Brabham • BMW | 01:45.194 | 01:45.194 | +03.143 (+3.080%) | +00.273 | |
| 11 | 11 | 8 | Marc Surer | Brabham • BMW | 01:45.979 | 01:45.979 | +03.928 (+3.849%) | +00.785 | |
| 12 | 12 | 1 | Niki Lauda | McLaren • TAG Porsche | 01:46.266 | 01:46.266 | +04.215 (+4.130%) | +00.287 | |
| 13 | 13 | 19 | Teo Fabi | Toleman • Hart | 01:46.546 | 51:32.220 | 01:46.546 | +04.495 (+4.405%) | +00.280 |
| 14 | 14 | 22 | Riccardo Patrese | Alfa Romeo | 01:46.592 | 42:47.460 | 01:46.592 | +04.541 (+4.450%) | +00.046 |
| 15 | 15 | 15 | Patrick Tambay | Renault | 01:47.028 | 01:47.028 | +04.977 (+4.877%) | +00.436 | |
| 16 | 16 | 26 | Jacques Laffite | Ligier • Renault | 01:47.267 | 01:47.267 | +05.216 (+5.111%) | +00.239 | |
| 17 | 17 | 25 | Andrea de Cesaris | Ligier • Renault | 01:47.393 | 02:12.268 | 01:47.393 | +05.342 (+5.235%) | +00.126 |
| 18 | 18 | 3 | Martin Brundle | Tyrrell • Ford Cosworth | 01:47.563 | 01:47.563 | +05.512 (+5.401%) | +00.170 | |
| 19 | 19 | 4 | Stefan Bellof | Tyrrell • Ford Cosworth | 01:47.911 | 01:47.911 | +05.860 (+5.742%) | +00.348 | |
| 20 | 20 | 9 | Manfred Winkelhock | RAM • Hart | 01:47.926 | 01:47.926 | +05.875 (+5.757%) | +00.015 | |
| 21 | 21 | 18 | Thierry Boutsen | Arrows • BMW | 01:48.023 | 01:48.023 | +05.972 (+5.852%) | +00.097 | |
| 22 | 22 | 24 | Piercarlo Ghinzani | Osella • Alfa Romeo | 01:48.546 | 02:11.904 | 01:48.546 | +06.495 (+6.364%) | +00.523 |
| 23 | 23 | 10 | Philippe Alliot | RAM • Hart | 01:50.455 | 02:24.814 | 01:50.455 | +08.404 (+8.235%) | +01.909 |
| 24 | 24 | 17 | Gerhard Berger | Arrows • BMW | 25:47.340 | 02:05.307 | 02:05.307 | +23.256 (+22.789%) | +14.852 |
| 25 | 25 | 29 | Pierluigi Martini | Minardi • Motori Moderni | 03:04.446 | 03:04.446 | +01:22.395 (+80.739%) | +59.139 |