Renault’s new engine upgrade has no “clear target” of when it will be introduced because of concerns over its reliability.

The news is sure to frustrate customers teams Red Bull and McLaren, but Renault are currently not seeing the right dyno figures come back with the MGU-K element of the power unit.

“It’s clear we have to work on the weight and this is one solution,” Renault Sport engine technical director Remi Taffin told Motorsport.com.

“That’s why we did not rush into running that solution. There is no clear target of when. I would more say when it’s ready we will get into it.

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