Red Bull Formula 1 chief Christian Horner says engine partner Renault must do its talking on-track when it comes to improving its power unit performance and cutting the gap to Mercedes and Ferrari at the front of the pecking order. Red Bull has made significant gains on the two front-runners in F1 this season, taking a victory on merit in Malaysia three weeks ago, but has long-stated its frustration with Renault over the performance gap with its engine. "As soon as you put a little bit of scrub the engine doesn’t pull through," Horner said of Red Bull's straight-line struggles at Suzuka. "It is very sensitive with acceleration at that point whereas if you’ve got the...
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