Renault's director of operations Remi Taffin has played down the chances of the French manufacturer engineering a surprise at the Canadian Grand Prix and says Renault must be 'realistic' with its expectations.

The engine supplier to Red Bull and Toro Rosso has come under heavy scrutiny in 2015 after multiple failures while also playing catch up to the likes of Mercedes and Ferrari.

Despite some solid results in Barcelona and Monaco, Taffin admits the Canadian Grand Prix will be a much trickier event due to the long, high-speed straights and the demands placed on the Power Units.

"We are realistic ahead of this race," Taffin said. "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.

Related Articles

"Knowing that power is critical, we have to try to repeat our Monaco approach, which was to optimise each sector individually. We are getting there, and hope we can be closer yet again in Montreal."

However, the French manufacturer can take confidence from last year's race when Red Bull's Daniel Ricciardo recorded his maiden Formula 1 Grand Prix victory and in the process broke the Mercedes dominance. Mercedes duo Lewis Hamilton and Nico Rosberg both suffered engine troubles midway through the race in Canada, enabling Ricciardo to fight back and take the win.

Taffin says delivering power smoothly from the Renault engine will be key if its teams are to enjoy more success at the Circuit Gilles Villeneuve.

"The straights are long so the driver needs strong acceleration, ideally reaching top speed towards the end of the straight," he explained. "The corners are tight and low speed, so the driver needs the power quickly to flick the car in and out of the chicanes, but smoothly through the hairpins.

"Giving the driver the power when he needs it is one of the key challenges of the weekend and we have worked particularly hard with the teams to develop engine maps and settings to this end."

Taffin added the Canadian Grand Prix is one of the toughest races to get right due to the heavy demands put on a number of components on the Power Units.

"The Circuit Gilles-Villeneuve also puts the internals under intense pressure. Over half of the track is taken at full throttle, with two long straights, and the heavy braking points at the end of those straights put the ICE under extreme load.

"Even the energy recovery systems will feel the pressure in Canada with the numerous heavy braking points and straights, so overall it's a very difficult race to get right."