Robert Kubica believes there is more potential to extract from the Renault car following the updates introduced for the European Grand Prix.
Kubica will start tomorrow's race from sixth position after another strong qualifying performance, the Pole happy with the result.
He said, however, that once Renault is more familiar with the updates, the car should be quicker.
"It has been a pretty good qualifying and the car was especially strong on the prime tyre," said Kubica. "On the options I had a lot more movement so the car felt quite different and we didn't really gain the lap time, but we made a decision that it would be better to start the race on the options.
"Although I finished higher in the first two parts of qualifying, I think the end result reflects our true position.
"The new updates on the car this weekend are bringing us some gains, but we still need to work to get 100% from them, which I hope we can do in the coming races."
Team-mate Vitaly Petrov was also pleased with his performance after reaching Q3, the Russian finishing in 10th place.
"It's fantastic to get into Q3 because the times were very close today," Petrov said. "Unfortunately I made some mistakes on my fastest lap in Q3 so I could maybe have been even higher on the grid.
"In the race anything can happen so I will try and look after my tyres and make up some positions. There are a lot of new parts on the car this weekend and I have had to adapt my driving style, but I can feel a big improvement with the car."