Red Bull and Toro Rosso engine supplier Renault says it has made big changes to its Formula 1 V6 turbo power unit for the 2015 world championship season. The French marque struggled as the new rules dawned last year, winning only three races compared to dominant Mercedes' sixteen. It prompted big organisational changes at Viry-Chattilon and also major upgrades for the 2015 engine, despite the fact the 32 performance ‘tokens' could actually have been deployed throughout the forthcoming season. 'We have used the majority of the tokens for the first race,' said technical boss Rob White, 'and our use of tokens during the course of the season will be relatively modest.' He said it is...
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