Sutton Images Enlarge Remi Taffin says the engine freeze imposed on manufacturers at the start of the season means it is highly unlikely Renault can make significant steps forward until 2015. After a difficult weekend on home soil at the Austrian Grand Prix last weekend Red Bull labelled Renault's performance as "unacceptable" as speculation grew about the team building its own engines for 2016. Engines were homologated at the start of the season, limiting changes to just reliability, safety or cost-cutting reasons, which Taffin concedes makes it tough for Renault to get too much closer to Mercedes this year despite Red Bull's frustrations. "The engine for this year, as...
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