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| Date | Sunday 22 September 1991 |
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| Start time | 14:00 |
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| Event | Portuguese GP |
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| Circuit | Estoril |
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| Event Format | Race of 71 laps |
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| Race | 13 of 16 |
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| Championship race | 513 |
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| Laps | 71 |
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| Circuit Perimeter | 4350 m |
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| Race Distance | 4350 × 71 = 308.850 km |
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| Grid Format | 2-2-2-2 (staggered) |
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| Pole Position | Left |
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| First Corner | Right |
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| Track Direction | Clockwise |
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| Weather | Sunny, Hot, Dry |
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| Entries | 34 |
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| Qualifiers | 26 |
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| Finishers | 17 |
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| Championship Debutants | Galp (Lubricant Manufacturer) |
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| Milestones | Braun Tyrrell Honda - 25th Race Entry (Entrant)
Camel Benetton Ford - 25th Race Entry (Entrant)
Canon Williams Team - 10th Win (Entrant)
Elf - 75th Fastest Lap (Lubricant Manufacturer)
Footwork Grand Prix International - 25th Race Entry (Entrant)
Footwork - 25th Race Entry (Car Manufacturer)
Ilmor - 25th Race Entry (Engine Manufacturer)
Jordan - 25th Race Entry (Car Manufacturer)
Lambo - 25th Race Entry (Car Manufacturer)
Larrousse F1 - 25th Race Entry (Entrant)
Modena Team SpA - 25th Race Entry (Entrant)
Team 7Up Jordan - 25th Race Entry (Entrant)
Williams - 50th Win (Car Manufacturer)
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| Records Broken |
1. Most 14th Place Finishes in a Season – Lotus (4),
2. Most 14th Place Finishes in a Season – Mika Häkkinen (3),
3. Most 22nd Fastest Laps – Tyrrell (18),
4. Most 6th Place Qualifications in a Season – Ferrari (8)
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| Records Extended |
1. Most Constructors' Championship Points Scores – Ferrari (431),
2. Most Retirements – Lotus (534),
3. Most Drivers' Championship Points Scores – Ferrari (563),
4. Most Podium Finishes – Ferrari (362),
5. Most 3rd Place Finishes – Ferrari (117),
6. Most 12th Place Finishes – Brabham (28),
7. Most 3rd Fastest Laps – McLaren (64),
8. Most 8th Fastest Laps – Ferrari (39),
9. Most 17th Fastest Laps – Lotus (34),
10. Most 19th Fastest Laps – Ligier (27),
11. Most Race Entries – Lotus (1230),
12. Most Race Entries – Riccardo Patrese (222),
13. Most Failures to Pre-Qualify – Coloni (51),
14. Most 5th Place Qualifications – Ferrari (117),
15. Most 5th Place Qualifications – Alain Prost (27),
16. Most 6th Place Qualifications – Ferrari (99),
17. Most 15th Place Qualifications – Brabham (46),
18. Most 6th Place Qualifications in a Season – Jean Alesi (7)
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