Jenson Button said he exaggerated when he said he feared McLaren may not score points at all in 2015 following a dismal Spanish Grand Prix.
The Briton finished in 16th position in the Barcelona race after what he described as the "scariest 30 laps" of his life as he struggled with the handling of his Honda-powered car.
McLaren is yet to score a point in five races, and Button was downbeat after the Spanish event.
But the former world champion says his emotions were running high after a very difficult day, and admitted he was feeling much more positive following the two-day test at Barcelona after the race.
"I was very outspoken but emotions are running high and you always exaggerate things," said Button. "It was a tough race for me in Barcelona but good to have the test three days later to put everything right.
"The car felt much nicer to drive, much more consistent especially on long-run pace. We had new parts to test, for this season but also specifically for here, so it was a good test.
"So I really ended the test happy and you can see how far we have come from February. As a whole team but especially Honda and the Japanese side of the team.
"So I've much more confidence within. I was happy to complete the amount of laps we did but also very useful work.
"Hopefully we can carry that through to this weekend."