Ross Brawn insists that Mercedes still has plenty of work to do despite an encouraging start to the 2013 F1 season.
Lewis Hamilton and Nico Rosberg have both taken a pole position after the opening for races of the season, while Hamilton has also secured two podium finishes thus far after his switch from McLaren over the winter.
However, the fact that both drivers were unable to turn their respective pole positions into victory has suggested there is work still do be done and Brawn admitted that making the F1 W04 quick over a race distance rather than just over a single lap was now a priority.
"It's not down to one lap,” he told Sky Sports
. “What we have to have is a car that is fastest over 50-odd laps, and that's the challenge. It's nice to have taken pole position at the last two races, but what really counts is the race itself, and I don't believe we're there yet.
"We've two drivers who have taken the equipment and done what they have on the last two Saturdays, but I don't think we have the equipment yet to be the strongest in the race. That's what we are working on."
Brawn admitted however that the results on the board already in 2013 were a sign that the team is moving in the right direction on the back of the extensive restructuring that has taken place at Brackley over the past year.
"From an engineering perspective, we know what we did twelve months ago is now coming through and giving us a reward," he said. "Changes were made back then which were painful at the time, and were part of the reason why we had a poor second half to last season. You have the pain for a while of those changes, which is what we had last year.
"We've now a very motivated group of people, and we're starting to put the things in place they need. When you do that the end result is you make progress. On the sporting side, we've two great drivers, and people I've worked with for a long time in the team. I know how they work, they know how I work.
"You can always look to add to it and tune it to improve, but you mustn't damage what you already have."