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Drivers Jarno Trulli, newcomer Timo Glock and number three Kamui Kobayashi joined the presentation of the TF108 at the team's Cologne headquarters.

 The Toyota F1 team has been in operation since 2000 and competing since 2002 but results have not matched the company's huge budget outlay of an estimated 400 million dollars a year.

 Last season the team was well off the pace of leading manufacturers Ferrari and McLaren - who this week also unwrapped their new cars - and is still without a win in 104 Grand Prix races.

 The last two seasons have been hugely disappointing after promising results in 2005 when Toyota achieved three podiums and a pole position.

 Team principal Tadashi Yamashina said the team needs to take make "a great improvement" on 2007 when it garnered just 13 points.

 "We are in Formula 1 to win, so we want to do this soon," he said of the team's aims for the season.

 "The drivers should be aiming to finish in the points regularly and challenging for podiums.

 "In the team we must make our best efforts to give the drivers a car which is capable of achieving our goals."

   Toyota has retained Italian Trulli and hired 25-year-old German Glock, the reigning GP2 champion, who replaces the departed Ralf Schumacher. Japan's Kobayashi is test driver.

 Trulli finished 13th in the F1 standings in 2007, Schumacher was 16th, while the team languished in sixth place in the constructors' championship.

 The 33-year-old Trulli said: "I think that the team has got the potential, the resources, the people and everything necessary to bounce back to the position where we belong.

 "Obviously it was a difficult season in terms of results and performance but we are all committed to making a significant improvement."

   Glock, who appeared in four Formula One races for the Jordan team in 2004, said: "This is a new start for me. Together with Jarno I want to get the team back in the top 10."

   The team hopes the TF108, which has a longer wheelbase, a major aerodynamic upgrade, revised suspension and a new gearbox, will revive fortunes.

 Yamashina has said Toyota may pull out of F1 altogether unless the team can start producing results over the next two years.

 However he said there was great optimism that the team would be much more competitive in the 2008 season.

 "At the factory everyone is motivated and pushing as hard as possible, always aiming for kaizen, continuous improvement," he said.

 "We have great potential in this team - we have the right people in place and the right resources so we have every reason to be optimistic."

   Technical director Pascal Vasselon said this year's car was a departure from last year's model which had been an evolution of the 2006 version, especially because of the new aerodynamic concept.

 "There is a lot of work to do to get the most out of the car before the season starts so there will be no let-up in our efforts," he said.

 The first official test will be on Monday in Jerez, Spain, and there will be a further five tests before the start of the season on March 16 in Melbourne, Australia.

By Claas Hennig, dpa