Williams FW31
Formula One Car for 2009 season
title: "Williams FW31" type: doc version: 1 created: 2026-02-28 author: "Wikipedia contributors" status: active scope: public tags: ["williams-formula-one-cars", "2009-formula-one-season-cars"] description: "Formula One Car for 2009 season" topic_path: "general/williams-formula-one-cars" source: "https://en.wikipedia.org/wiki/Williams_FW31" license: "CC BY-SA 4.0" wikipedia_page_id: 0 wikipedia_revision_id: 0
::summary Formula One Car for 2009 season ::
Car_name = Williams FW31 | Image = [[File:Nakajima 2009 Spain.jpg|260px]] | Category = Formula One |Caption=Kazuki Nakajima driving the FW31 at the 2009 Spanish Grand Prix| Constructor = Williams | Designer = Sam Michael (Technical Director) Ed Wood (Chief Designer) Clive Cooper (Head of Design - Composites and Structures) Christopher Brawn (Head of Design - Suspension, Steering, Breaks) Mark Loasby (Head of Design - Systems) Jon Tomlinson (Chief Aerodynamicist) Enrico Balbo (Double Diffuser, Concept Lead) | Predecessor = Williams FW30 | Successor = Williams FW32 | Team = AT&T Williams | Drivers = 16. Germany Nico Rosberg 17. Japan Kazuki Nakajima | Technical ref = | Chassis = Carbon-aramid and honeycomb composite monocoque. | Front suspension = Carbon fibre double wishbone, with pushrod activated springs. Zero keel geometry. | Rear suspension = Double wishbone, with pushrod activated springs. | Wheelbase = 3100 mm | Track = | Engine name = Toyota RVX-09 | Capacity = 2.4 L | Configuration = 90° V8. Limited to 18,000 rpm. | Turbo/NA = naturally-aspirated, | Engine position = longitudinally mid-mounted. | Power = 740 hp @ 18,000 rpm | Gearbox name = Williams | Gears = 7-speed | Type = electro-hydraulically actuated, semi-automatic, seamless shift. | Differential = | Weight = 605 kg (including driver) | Fuel = Esso | Lubricants = Mobil 1 | Tyres = Bridgestone Potenza | Debut = 2009 Australian Grand Prix |Last_event=2009 Abu Dhabi Grand Prix| Races = 17 | Wins = 0 | Cons_champ = | Drivers_champ = | Poles = 0 | Fastest_laps = 1 | Podiums = 0 The Williams FW31 was a Formula One motor racing car, designed and built by Williams F1. The AT&T Williams team used the FW31 to compete in the 2009 Formula One season. The car was unveiled on 19 January 2009 at the Autódromo Internacional do Algarve circuit in southern Portugal, and was first driven by the team's test driver Nico Hülkenberg. It was a mid-field runner, in contention for points on many occasions when driven by Rosberg, but rarely contending for podiums. Rosberg could have finished in third position at Marina Bay during the 2009 Singapore Grand Prix if he had not run wide on the exit of the pit lane and received a penalty.
Rosberg was criticised for failing to achieve a pole position while topping the times in practices on numerous occasions, notably at the 2009 Brazilian Grand Prix - the Williams cars had excelled during practice sessions in wet conditions, but did not produce the same level of performance in qualifying. While Rosberg often scored points, and elevated the car to a finishing position that it was considered incapable of, Nakajima failed to score a point all season and possibly cost the team a higher position in the championship standings than the seventh place they eventually achieved.
The Williams FW31 was the first British F1 car to use Esso-branded fuel since 1973, as well as the first Williams F1 car to use Mobil 1 lubricants since 1988 season, as they had been using ExxonMobil brands since 1999.
Diffuser controversy
::figure[src="https://upload.wikimedia.org/wikipedia/commons/e/e2/Williams_FW31_Jerez_Feb_2009_3682a.jpg" caption="FIA]]."] ::
At the first race of the season, an official complaint was launched by other teams against the rear diffusers of the Williams FW31, Toyota TF109 and the Brawn BGP 001 saying that they were illegal, but after analysing the cars, the FIA reported that the cars were not illegal. The teams appealed and after much deliberating the car were deemed legal by the FIA.
Season review
The Williams FW31 was a slight improvement compared to previous FW28-30 cars as the team tried to get used to the major new rules in 2009. Rosberg proved to be a consistent challenger for points, though he could not clinch a podium finish. It could have been a 2nd consecutive podium finish in Singapore for Rosberg, who was running 3rd before a pit-stop. After the pit-stop, his car ran wide, causing a drive through penalty. The safety car was sent out on track, and he could not serve his penalty until the safety car was called in, ending his chances of a podium finish.
Gallery
File:Nico Rosberg 2009 Germany 2.jpg|Nico Rosberg at the 2009 German Grand Prix, July 2009 File:Nakajima Williams FW31.jpg|Kazuki Nakajima during Spanish Grand Prix Qualifying, 9 May 2009 File:Nico Rosberg 2009 Turkey 2.jpg|Nico Rosberg at the 2009 Turkish Grand Prix, June 2009 File:Kazuki Nakajima 2009 China.jpg|Kazuki Nakajima in the wet at the 2009 Chinese Grand Prix, 19 April 2009 File:Williams duo 2009 Japan.jpg|Nico Rosberg and Kazuki Nakajima at 2009 Japanese Grand Prix, 4 October 2009 File:Williams FW31 in garage.JPG|Mechanic working on Nico Rosberg's Williams FW31 during practices on Friday of 2009 Turkish Grand Prix File:Williams FW31 front wings.JPG|Front wings outside Williams garage between two 2009 Turkish Grand Prix Friday practice sessions File:Williams FW31 Australia practice.jpg|The Williams team practice pit stops during Australian Grand Prix Friday Practice, 27 March 2009 File:Button Rosberg 2009 British GP.jpg|Nico Rosberg and Jenson Button at the 2009 British Grand Prix, Silverstone, 21 June 2009
Formula One World Championship results
(key) (results in bold indicate pole position; results in italics indicate fastest lap) ::data[format=table]
| Year | Entrant | Engine | Tyres | Drivers | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | Points | WCC | 34.5 | 7th |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| AT&T Williams | Toyota RVX-09 V8 | AUS | MAL | CHN | BHR | ESP | MON | TUR | GBR | GER | HUN | EUR | BEL | ITA | SIN | JPN | BRA | ABU | |||||||
| Rosberg | 6 | 8 | 15 | 9 | 8 | 6 | 5 | 5 | 4 | 4 | 5 | 8 | 16 | 11 | 5 | Ret | 9 | ||||||||
| Nakajima | Ret | 12 | Ret | Ret | 13 | 15 | 12 | 11 | 12 | 9 | 18 | 13 | 10 | 9 | 15 | Ret | 13 | ||||||||
| :: |
Driver failed to finish, but was classified as they had completed 90% of the race distance.
Half points awarded as less than 75% of race distance completed.
References
References
- "Car: Tech Spec". www.WilliamsF1.com.
- statsf1.com/en/moteur-toyota.aspx
- link. (2009-03-30)
- (28 March 2009). "Date set for F1 diffuser appeal".
- [https://news.bbc.co.uk/sport1/hi/motorsport/formula_one/7996698.stm FIA deem diffusers legal] BBC Sport. 2009-04-15. 2009-04-15
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