Red Bull-owned Toro Rosso have been testing the STR4 behind closed doors at the Adria International Raceway in Italy this week, but on Monday the car will be officially launched at the Circuit de Catalunya, before testing alongside its rivals.
The STR4 chassis is based on Red Bulls RB5 - both designed by Red Bull Technologies - but powered by Ferrari rather than Renault. Last year Toro Rosso surprised by out-performing their supposedly senior sister team, even scoring a maiden victory at the Italian Grand Prix.
With Monza winner Sebastian Vettel having departed for Red Bull, Toro Rossos 2009 driver line-up comprises the recently reconfirmed Sebastien Bourdais and Swiss GP2 graduate Sebastien Buemi.
formula1.com
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