Red Bull is setting its sights on F1's third-best team.

The 2010-2013 champions have already ruled out a tilt for this year's title, with engine supplier Renault taking most of the blame so far.

But Red Bull is also working hard on its chassis, with a big upgrade for Barcelona set to feature the stamp of now part-time technical chief Adrian Newey.

At centre-stage of the RB11's Barcelona upgrade is a new, ultra-short front nose.

"It (the package) should solve the problems we have had with the chassis and allow us to take a big leap in performance," team official Dr Helmut Marko told Brazil's Globo.

"I think we will be able to fight with Williams," he added. "That is, of course, if Renault do their part as well."

Indeed, Williams' FW37 is powered by the field-leading Mercedes power unit, with Red Bull announcing last week that it will have to compensate in the area of aerodynamics.

Marko would not go into detail.

"I say only that we are doing our part," he said. "If we have a car with a good engine, it will allow us to fight, sometimes for the podium.

"Adrian is 100 per cent focused on the project," Marko added.