Fernando Alonso has revealed he has already had some input into the basic configuration of Ferrari's 2010 car.
The Spaniard, who will get his first turn at the wheel of the F10 at Valencia on Wednesday, told Italy's La Stampa: "I worked to simplify the steering wheel, which seemed very complex."
But twice world champion Alonso, who has switched to the famous Italian team from Renault, added: "I have confidence that this team's engineers are the best in the world."
He also urged observers to react to Valencia's testing time sheets this week with caution, despite the circuit also hosting the concurrent debuts of the new Mercedes, McLaren, Williams, Renault, Sauber and Toro Rosso cars.
"It will be difficult to make comparisons," said the 28-year-old, referring to the doubling of fuel tank sizes for this year in reaction to the pitstop refuelling ban.
"One day we might be first (at the test), and the next day last."
Felipe Massa will give the F10 its debut on Monday and Tuesday, where warm and dry weather is forecast for the Ricardo Tormo circuit in Cheste.