Red Bull hope for new diffuser in Monaco
Red Bull hope to have an upgrade to their car in time for the Monaco Grand Prix as they bid to make up ground on championship pace-setters Brawn.
Red Bull's Mark Webber and Sebastian Vettel were third and fourth behind the Brawns in Sunday's Spanish Grand Prix.
And design chief Adrian Newey said the team were racing to have a new 'double-decker' diffuser for Monaco on 24 May.
"It's very tight for our production facilities but we're pushing hard," he said. "It could be a real benefit."
Brawn are one of three teams, along with Toyota and Williams, who started the season with the controversial split-level 'double-decker' diffuser - which gives greater aerodynamic downforce and thus more speed.
Webber delighted with Red Bull strategy
Red Bull were one of the teams who protested against the design, believing it to be illegal.
But their protest was rejected by governing body the FIA last month, leaving the rest of the field to produce their own versions of the design.
"We've been trying to look at that," said Newey. "It's not easy for us to put a double diffuser on our car.
"It's not designed for that in the first place with the pull-rod rear suspension and some of the aerodynamics of the car so we've been trying to work out how to do that.
"We have a solution which we believe may be able for Monaco."
Australian Webber took the final podium place behind winner Jenson Button and Rubens Barrichello in Spain after a clever strategy switch vaulted him ahead of team-mate Vettel.
Vettel - the only driver to deny Button victory in five races this season when he led home a Red Bull one-two in China - started second in Spain with Webber fifth on the grid but the German was passed by Ferrari's Felipe Massa at the start and was stuck behind him for almost the entire race.
Rather than try to think about championships, we're doing everything we can to develop the car as quickly as possible
Red Bull design chief Adrian Newey
The German finished fourth, passing Massa when the Brazilian began to run out of fuel in the closing stages, while Webber vaulted up to third by running a longer middle stint, which gave him extra laps to make up time on the cars in front of him.
Newey, who was talking to BBC Sport, said he believed Red Bull could have beaten Brawn in a straight fight had the cars not been held up by Massa at the start
"From what we can see our pace in the race was probably actually quicker than Brawn," Newey said.
"So it's been slightly frustrating that in the last two races we've had a car that's probably been the quickest car in the race, but we haven't had a win out of either of them.
"So we've obviously got to learn from that."
Former Honda team Brawn lead the constructors' championship by 29.5 points from Red Bull while Vettel lies four points behind second-placed Barrichello - and 18 behind Button - in the drivers' championship, with Webber seven and a half points behind him.
"It's still sufficiently early in the season that it's best to take it race by race," said Newey.
"Rather than try to think about championships, we're doing everything we can to develop the car as quickly as possible and stay ahead of that development race if we possibly can.
"At the end of the year, we'll see where that's taken us."