Jean-Eric Vergne and Daniel Ricciardo expressed their optimism following practice for the Bahrain Grand Prix.
Vergne was twelfth in second practice, two places ahead of team-mate Ricciardo.
"It seems our pace is similar to that in China, at the end of a day when everything worked well," said Vergne.
"It’s all looking quite positive and I got a good feeling from the car. As for the tyres, the lap time difference between the Prime and Option is not as great as in China, but the heat means there is quite a lot of thermal degradation which will make life quite tricky in the race."
Ricciardo, who finished in seventh place in China, added that he was cautious not to make too many changes in the dusty conditions.
"The first day here is quite complicated as the track is always dusty in the morning and that makes setting the car up rather tricky as the track is always improving," he said.
"You are obliged therefore not to get too carried away in terms of making lots of changes. In the afternoon, we were tempted to make some changes and I’m not sure they were an improvement."
"I believe we have a good platform to work from. The Option which I tried this afternoon is obviously going to be quicker for qualifying, but the gap is not as great as last weekend. It pays not to push the tyres too hard I think."