Red Bull says it will begin to step on the throttle in the forthcoming Formula One test at Barcelona.
The camouflaged Renault-powered RB11 did not feature highly on the timesheets during the first test at Jerez, leading to suggestions that Red Bull is not as fast as it hopes.
But Red Bull's Helmet Marko has played down the Jerez times, however, saying the goal was never to show strong pace.
"At the first test, it was all about getting the car running," Marko told German correspondent Ralf Bach's blog f1-insider.com.
"We ran very conservatively in every respect, and haven't really even worked on the set-up yet.
"We were using a mix of old and new parts and were driving with reduced engine power," he added.
More pace needed at Barcelona
Marko says Red Bull will have to start to show stronger form at Barcelona if it is to be competitive when the season kicks off in Australia.
"We must begin now to make the car faster," he said, "or there will not be enough time before the first race in Melbourne.
"We believe we have built a really good car."
The RB11 will also get a further boost from "the third round in Shanghai at the earliest", Marko added, when the first stage of Mario Illien's input on the Renault engine side will hit the track.