Felipe Massa: Williams better at bringing F1 upgrades than Ferrari

Massa raced for Ferrari from 2006-13, but in the later years of his stint he was frustrated by the number of new parts tried that did not produce the anticipated improvement on track.

But with Williams planning "a big step forward in all areas of the car", according to head of vehicle performance Rob Smedley, Massa has no doubts about his new team's ability to make an improvement.

"Last year, I don't remember one race where we brought some new parts and they worked, and we had a lot of new parts," said Massa when asked by AUTOSPORT whether his confidence in the Williams team's ability to deliver effective upgrades is greater than what he felt at Ferrari.

"Most of the races you had new parts and they never worked and we always removed them on Friday evening.

"The work we are doing at Williams, the new parts that we bring into the car [work].

"The only thing we couldn't use yet was the bigger rear wing, which is something that hasn't been working since the first race.

"Apart from that, everything we brought is in the car so I'm 100 per cent sure that new parts here, and every race, should work."

Massa stressed that while he does not expect the car to be transformed this weekend, a clear improvement should be evident.

Williams has made a strong start to the season and already has seven times the points it scored in the whole of 2013 but Massa warned that its place in the competitive order will be dictated as much by how other teams improve as it is by its own progress.

"It is not something that will change completely the car but it is important to keep developing the car," said Massa.

"I hope we can have a step forward but it's also true that the other teams have as well.

"Everybody is improving, everybody is growing and we need to keep growing as well. That's what we are working for."