Paul di Resta is confident of a strong result heading into qualifying for the Bahrain Grand Prix, but team-mate Adrian Sutil admits he is not completely comfortable with the Force India VJM06.
Di Resta finished in sixth place in Bahrain last season and was again troubling the frontrunners by setting the fifth fastest time in both practice sessions.
"As Fridays go it’s been positive and we’ve achieved as much as we could realistically have hoped for," said the British driver.
"The car is working well and responding as we expected, and we’ve already got a reasonable idea of where we stand. There is still some optimising to do, as always, but if we can take another step forward tonight we should be in a strong position going into qualifying."
Sutil was ninth quickest in second practice, four tenths shy of his team-mate.
"I’m still not totally comfortable with the car – either for short or long runs," he said.
"It all feels very low grip at the moment so the set-up is not quite right for me yet. As for the tyres, there are no real concerns. My long runs looked competitive and both the medium and hard compounds seem to be working well for us in the high temperatures – as they did in Malaysia."
Chief race engineer Jakob Andreasen believes both cars should progress to Q3 on Saturday.
"It was a slick session and sets us up nicely for tomorrow. With a few more tweaks overnight we should be able to keep up the momentum and get both cars in Q3 tomorrow afternoon," he said.