Red Bull team boss Christian Horner criticised the performance of engine supplier Renault as 'unacceptable' after the Austrian Grand Prix. Red Bull's home race was their worst of the season - Daniel Ricciardo finished eighth and Sebastian Vettel retired after being delayed by an engine problem. Horner said: 'The situation just isn't improving. The reliability is unacceptable. The performance is unacceptable. Please turn on JavaScript. Media requires JavaScript to play. // Watch Sebastian Vettel spin off in Austria GP practice require( ["sportui/empswitch"], function(empswitch) { empswitch.init(); } ); 'There needs to be change at Renault. It can't continue like this.' Renault's...
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