Renault's director of operations Remi Taffin says the Monaco Grand Prix throws up completely different challenges on its power units which could work in the manufacturer's favour.

Taffin, who calls the Monte Carlo street circuit a 'special' event, says his engineers focus on engine mapping and slower speed configurations due to the nature of the track.

The tight and twisty circuit sees drivers only use full throttle for 42% of each lap, the lowest percentage at any track on the Formula 1 calendar.

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"For engineers, it's the challenge of working on parts of the engine or software that you don't normally focus on," Taffin said. "In Monaco we explore maps and settings to target driveability and performance on low speed and low rev settings.

"The average speed is the lowest of the year and the corners are so tight that power is not important; you need stability under braking and an engine that responds well out of the corners.

"For these reasons you may use levels you will not touch for the rest of the year and conduct work that is specific for just this one track. It's necessary as every hundredth of a second could be a couple of places on the grid and, as we all know, grid position in Monaco is crucial."

The under-fire French manufacturer will be hoping for some respite from criticism at a track which is easier on the power units.

Red Bull's Daniel Ricciardo is already on his fourth engine of the season and after last week's F1 Strategy Group meeting rejected the proposal for an additional fifth engine for 2015, Renault will have to nurse the Australian driver's machine for the remainder of the season.