Felipe Massa says successful updates to the FW36 should give Williams confidence about developing the car for the rest of the season.

The team was testing a number of new parts during Friday practice, with the majority set to remain on the car for the rest of the weekend. Massa said the fact that the upgrades provide the expected step forward was exciting as it allows Williams to focus on development rather than correlation between wind tunnel and track.

"I'm happy that most of the things we have here we're using - apart from the rear wing - so I think that's positive," Massa said. "We need to keep pushing to bring more pieces and to improve the car. I'm sure this car has good potential and I'm really looking forward to carrying on having a good weekend tomorrow and the day after, but also concentrating on the development of the car as well.

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"It's OK, it's what I expected. It's the improvement that was expected coming from the wind tunnel."

While encouraged by the updates, Massa said Williams still faces a tricky weekend trying to maximise its potential.

"The track temperature is low and the tyres are also slippery a bit. We have some degradation, we have some graining on the front as well so we need to try to understand the right balance to avoid this graining. We'll see, it's just the first day and tomorrow could be raining as well so we need to be ready for everything; everything can change with the conditions."