Toro Rosso STR4
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| Category | Formula One | ||||||||||
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| Constructor | Toro Rosso | ||||||||||
| Designer(s) | Adrian Newey | ||||||||||
| Predecessor | Toro Rosso STR3 | ||||||||||
| Successor | Toro Rosso STR5 | ||||||||||
| Technical specifications | |||||||||||
| Chassis | carbon-fibre and honeycomb composite structure | ||||||||||
| Suspension (front) | cast titanium uprights, pushrods, carbon-fibre upper and lower wishbones | ||||||||||
| Suspension (rear) | cast titanium uprights, pullrods, carbon-fibre upper and lower wishbones | ||||||||||
| Engine | Ferrari 056 (2008-spec) 2398cc V8 18,000 RPM Limited | ||||||||||
| Transmission | 7-speed | ||||||||||
| Fuel | Shell | ||||||||||
| Tyres | Bridgestone | ||||||||||
| Competition history | |||||||||||
| Notable entrants | Scuderia Toro Rosso | ||||||||||
| Notable drivers | 11.  Sébastien Bourdais11.  Jaime Alguersuari12.  Sébastien Buemi
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| Debut | 2009 Australian Grand Prix | ||||||||||
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The Toro Rosso STR4 was a Formula One car which Scuderia Toro Rosso used in the 2009 Formula One season. The car was revealed to be a Red Bull RB5 with a Ferrari engine in Barcelona on March 9, 2009. It was revealed before the testing session.
The STR4 was driven by Sébastien Bourdais and Sébastien Buemi for the first half of the season. Jaime Alguersuari replaced Bourdais from the Hungarian Grand Prix onwards.
Buemi scored a 7th place on his debut race at the 2009 Australian Grand Prix. His team-mate Sebastian Bourdais also scored points that race. He went on to finish 8th in China, before finishing 7th and 8th in the final two races in Brazil and Abu Dhabi.
Bourdais scored an 8th place at the 2009 Australian Grand Prix. His team-mate Sébastien Buemi also scored points that race. However Bourdais had poor results during the 2008 season, scoring only 4 points unlike his 2008 team-mate Sebastian Vettel who scored 35 and a race win in Monza. At the 2009 Hungarian Grand Prix, he was replaced by Jaime Alguersuari following a similar season of poor results, having scored only 2 points after the German Grand Prix before he was fired.
Alguersuari made his debut at the Hungarian Grand Prix as his predecessor Sébastien Bourdais was replaced following a string of poor results. However he only managed to finish 3 races out of the 8 he raced in, with a best result of 14th in the Brazilian Grand Prix.
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