Revamped Renault are confident their Formula One power unit will be a lot better this season after struggling in a 2014 campaign dominated by Mercedes. "We knew what we had to do over the winter and we know what we have achieved," F1 managing director Cyril Abiteboul said on Wednesday ahead of the start of testing in Spain at the weekend. "We believe we have made a very big step in performance and will be more reliable. "We may not have erased all the gaps but we are confident that we have gone a long way to making up the deficit of last season," the Frenchman added. Red Bull Racing and Toro Rosso, both owned by the Austrian energy drink company, are now Renault's...
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