Red Bull Racing brought a revised RB13 to Barcelona last weekend and the changes helped its drivers inch closer to front-runners Mercedes and Ferrari.

But the Milton Keynes-based outfit still remains at a fair distance from its rivals, forcing it to sustain its development efforts as rivals also evolve.

There will be only minor upgrades for Monaco, while a special low downforce package will debut in Canada.

So Red Bull has now scheduled its next big RB13 upgrade for its home race in Austria in early July, with the team also hoping that a planned update of its Renault power unit shall also be available by then.

"If we could turn the power up full, we would not be far from Mercedes and Ferrari," an unnamed team member said.

"But because of reliability, we can't do it yet."

The team's performance deficit this year has brought Adrian Newey back into the paddock after the famous F1 designer spent much of his time in the last two years on non-F1 projects.

"Adrian wanted the feedback from the drivers to better understand the car and determine the direction for the future," team boss Christian Horner told Auto Motor und Sport..

"We are looking at which of our tools we can rely on and which we cannot. The wider tyres have a greater impact on aero than we thought."

Win the ULTIMATE TRACKDAY with F1i.com!



GALLERY: All the action from Barcelona on Sunday

Keep up to date with all the F1 news via Facebook and Twitter