Robert Kubica says he has been pleased with the progress made by his Renault team in testing, despite a discreet showing in the opening two sessions.
Renault was one of the first teams to unveil its 2010 challenger, with which the French squad is aiming for a strong season after a few disappointing years.
Kubica, joining the team from BMW Sauber, believes the team is heading in the right direction.
"Although the bad weather has affected our track time, we've made a lot of progress, particularly last week in Jerez where we found some good performance," said Kubica.
"What is important is that the car is not too sensitive and that makes it easier to find a good set-up.
"There are a few things still to come for the other tests that will make me feel even better in the car and which will also make it quicker, but we're definitely moving in the right direction."
The Pole, who has only raced with BMW Sauber in Formula 1 so far, admitted he is already feeling at home with his new team.
"It already feels like home and it's a nice group of people to work with," he added. "I had an idea of what Renault would be like before I joined and it has been just as I expected. The team is very motivated and looking forward to the big challenge we have ahead of us to bring Renault back to the front of the grid.
"Everybody is working hard and it was nice to see such a quick response from the guys in the factory to make the changes we needed after the Valencia test in time for Jerez."