Christian Horner has hit back at Renault's imposition of a May deadline to decide its engine supplier for 2019. It is no secret that Red Bull installed Honda as Toro Rosso's engine supplier this year in order to open the door to a potential deal for the main team in 2019. Currently, Red Bull uses a customer Renault engine, but Horner thinks the French marque is hitting a performance limit with its current power unit. And relations between the two sides are strained. 'We will have to see how it goes this year, but whenever we have a power deficit, we have to try to compensate with the car,' Red Bull boss Horner told El Confidencial. It is suggested that Renault may advise its teams to...
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