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| Date | Sunday 21 October 1984 |
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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 70 laps |
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| Championship | World Championship |
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| Race number | #16 of 16 in 1984
#404 (of all time) |
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| Laps | 70 |
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| Circuit Perimeter | 4350 m |
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| Race Distance | 4350 × 70 = 304.500 km |
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| Grid Format | 2-2-2-2 (staggered) |
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| Pole Position | Right |
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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 | 27 |
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| Qualifiers | 27 |
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| Finishers | 17 |
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| Debutants |
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| Milestones | Equipe Renault Elf – 200th Race Entry (Entrant)
Toleman Group Motorsport – 50th Race Entry (Entrant)
 René Arnoux – 100th Race Entry (Driver)
Renault – 200th Race Entry (Car Manufacturer)
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| Records Broken |
None
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| Records Extended |
1. Most Constructors' Championship Points Scores –  Ferrari (334),
2. Most Retirements –  Lotus (446),
3. Most Drivers' Championship Points Scores – Ferrari (466),
4. Most Drivers' Championship Points Scores –  Niki Lauda (70),
5. Most Constructors' Championship Points Scores – Niki Lauda (70),
6. Most Podium Finishes – Niki Lauda (53),
7. Most 2nd Place Finishes – Niki Lauda (21),
8. Most 4th Place Finishes – Ferrari (76),
9. Most 9th Place Finishes – René Arnoux (11),
10. Most Race Wins in a Season – McLaren (12),
11. Most Race Entries – Lotus (1012),
12. Most 8th Place Qualifications – Ferrari (58),
13. Most 15th Place Qualifications – Jacques Laffite (11),
14. Most 2nd Place Qualifications in a Season – Alain Prost (8),
15. Most 26th Place Qualifications in a Season – RAM (7),
16. Most 26th Place Qualifications in a Season – Jonathan Palmer (5)
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