Red Bull F1 boss Christian Horner says Renault has to "throw caution to the wind" after admitting his team in nowhere near a return to winnings ways.
A Red Bull car is yet to finish higher than sixth after the first five races of 2015, and the team lies fourth in the standings, more than 170 points behind leader Mercedes.
Although reliability has added to Red Bull's frustrations, Horner believes Renault has to start taking more risks in order to move closer to the front, even if it means using 20 engines.
We just have to go for it, even it means we end up using 20 engines.
"I think we are nowhere near winning a grand prix," said Horner after the Spanish Grand Prix. "You can see we got lapped today. It's better to focus on getting performance, because we are on the backfoot anyway.
"You have nothing to lose by throwing to the wind. We are not in Formula 1 to make up numbers. We are in it to try to compete at the front.
"If that means taking some risks that's always been our philosophy and that's what we would encourage for Renault to do as well.
"We are so far on the backfoot with the reliability anyway. This year is pretty much a write-off.
"We just have to go for it, even it means we end up using 20 engines."
In contrast, however, Renault's director of operations Remi Taffin said after the race that the French manufacturer must stay conservative.
"We were less conservative in qualifying and showed that the potential is still there, but we took a safe approach in the race. We now need to maintain this platform and build on it for the next races," Taffin said.
"In parallel we are aware we need to raise our game in performance but we need to do this without taking any risks with the reliability."
No significant step until second half of 2015
Horner fears Renault has no immediate solution to its power deficit and will take at least until the second half of the season to make a significant step forward.
"I think they know what the deficit is," Horner added. "The question is how they are going to make that up. I think that's the bit that they don't know at the moment.
"They've got things in the pipeline and things for later in the year, but it's a work in progress. Obviously from the team's point of view we want it as soon as possible.
"I think it will certainly be the second half of the year before we see anything significant.
"Things in the engine world seem to take an awful lot longer than on the chassis world."