Renault insists it has made progress with its 2014 F1 engine despite another troubled week of running in Bahrain.Although Red Bull, Toro Rosso and Caterham were able to complete more mileage than in Spain during the opening test of the year, none were able to challenge towards the top of the time sheets and continued to encounter some issues with the all new power-plant.The Bahrain test also saw Lotus hit the track for the first time alongside its rivals and while Pastor Maldonado was able to post the quickest Renault-powered time, it was more than five seconds off the pace set by Nico Rosberg for Mercedes.Despite that Renault's deputy managing director (technical) Rob White said he felt...
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