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This week in Brazil, Red Bull's engine manufacturer Renault will have the cars running with a new-specification alternator, even though the team especially chose the older one last week.
WSJ: Vettel Leaves Nothing to Chance
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However, the UK-based Austrian team will need to make adjustments after ruling body the FIA deemed Red Bull's engine mapping to change the aerodynamics of the cars and therefore be illegal.
CNN: Ferrari chief 'concerned' by F1 rivals' progress
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Toro Rosso will use the same car as Red Bull, but fitted with a Ferrari engine rather than the Renault used by their parent team.
BBC: Bourdais seat cuts Button options
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Renault is now officially in F1 only as an engine supplier - to Red Bull, Renault and Team Lotus - and now, through Infiniti, as a sponsor of Red Bull.
BBC: Red Bull get budget boost through Infiniti link-up
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Sebastian Vettel's Red Bull and Robert Kubica's BMW Sauber suffered engine problems on day one in Monte Carlo.
BBC: Rosberg sets Monaco practice pace
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Toro Rosso has essentially been a feeder team for Red Bull, using a chassis based on its parent team's design but a Ferrari engine instead of the Renault-powered cars driven by David Coulthard and Mark Webber.
CNN: F1 changes force Toro Rosso sale
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Vettel's second fastest lap was in sharp contrast to Red Bull team-mate Mark Webber's performance, with the Australian's car suffering suspected engine failure.
CNN: Hamilton dominant in Malaysia practice
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Brawn, whose car is powered by a Mercedes engine, needed half a point to wrap up the title in Brazil, ahead of closest rivals Red Bull, and they picked up five.
BBC: Brawn win title in debut F1 year