Renault won't be bringing a major upgrade to its power unit until next year according to managing director Cyril Abiteboul, contrasting claims made by Red Bull team principal Christian Horner. Renault this year debuted a new concept it said would provide major development opportunities, but Abiteboul has said that will be delivered in minor improvements on a race-by-race basis and there would be no 'big' upgrade until 2018. That goes against what Horner recently said, with the Renault customer team boss suggesting a big perfomance boost originally expected for the Canadian Grand Prix would now come in Azerbaijan. That won't be happening, Abiteboul confirmed to the official...
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