Renault is expecting the Canadian Grand Prix to be difficult for its teams after having focused on reliability rather than on improving engine performance.
The French manufacturer, which won last year's race with Daniel Ricciardo and Red Bull Racing, will introduce reliability upgrades for the Montreal event. It has focused on a revised piston design, to solve the main problem it has endured since the start of the season.
The focus on reliability, however, has meant that no significant improvements have been made in terms of performance for its teams Red Bull and Toro Rosso.
With the Montreal circuit's straights rewarding a powerful engine with strong torque and driveability out of the slow corners, Renault's director of operations Remi Taffin believes the weekend will not be easy.
"We are realistic ahead of this race," said Taffin. "We've put in a great deal of work on reliability and have improved our record in the last two races, but we know that Montreal will be tough for us performance-wise.
"Knowing that power is critical, we have to try to repeat our Monaco approach, which was to optimize each sector individually.
"Unlike Monaco, however, we also need to assess the right drag/downforce compromise to allow good performance in qualifying and the race.
"We are getting there, and hope we can be closer yet again in Montreal."