This morning, Scuderia Toro Rosso unveiled its contender for the 2009 Formula 1 World Championship before beginning a four day test programme alongside every other team entered in the series.

At nine o'clock, as soon as the pit lane opened, Sebastien Bourdais took to the track for the initial installation lap. After that, it was back to the garage for the usual checks.

The STR4 is a joint venture between Red Bull Technology and Toro Rosso and once again this year, it is fitted with a Ferrari V8 engine.

"In 2008 our performance exceeded our expectations," said team principal, Franz Tost. "It's going to be tough to live up to that this year. Within the team we can rely on a good level of stability, as all the key players on the technical side have been in place for some time now.

“Further stability comes courtesy of the input of Red Bull Technology. From Red Bull Racing's first test in Jerez it appeared the chassis was competitive and that Adrian Newey and his team had come up with a very promising package. This year marks the third year of our collaboration with Ferrari, which, on both a human and technical level, works very well.

“In 2008 we lined up two F1 novice drivers, but Bourdais now has 18 Grands Prix under his belt, and this year's rookie, Buemi, has already shown well in winter testing."

Sebastien Bourdais, who shook down chassis 01 at the Adria track last week, drives today and tomorrow in chassis 02, before handing over to Sebastien Buemi for the final two days.

To see our first pics of the STR4, click here