Renault's director of operations Remi Taffin says his team has been working 'flat out' to solve its early season problems and expects an immediate improvement at this weekend's Spanish Grand Prix.

The French manufacturer's well publicised issues with its 2015-spec turbocharged V6 power unit has seen Renault come under heavy fire from Red Bull. Renault has suffered multiple engine blow ups and targeted reliability with an extremely conservative strategy in Bahrain. The plan paid off as the Red Bull duo of Daniel Ricciardo and Daniil Kyvat both finished in the points.

Neither of Toro Rosso's Max Verstappen or Carlos Sainz Jr made it to the chequered flag in the Middle East but to Renault's relief both DNFs were due to separate issues. Sainz had to pull out of the race after leaving the pits with a loose wheel while Verstappen stopped with an electrical problem.

Related Articles

However, doubts still exist as Ricciardo's RB11 crossed the line in Bahrain with a worrying white plume of smoke coming from the exhausts.

"The three week gap has given us an opportunity to look at all the information from the start of the season," Taffin said. "We have been flat out to counter the issues encountered early on and we will have a modified spec of engine for this race that should give improved reliability and driveability."

Taffin rates the Circuit de Catalunya as 'medium difficulty' on the power units and is hoping to see a noticeable increase in performance this weekend.

"Barcelona is much more of a traditional circuit than the first four tracks we have visited so far this year," he explained. "The layout flows a lot more, with high and medium speed corners rather than tight, slow hairpins and long straights. It also has changes of altitude as the track follows the contours of the hills.

"As such, the circuit represents medium difficulty for the Power Units, which subsequently have to deliver good all-round performance across all the parts. We are looking forward to Spain to see our hard work in action."