Renault admits it has numerous problems with its new power unit and that it underestimated how it would perform on track.After issues throughout the first test at Jerez, Renault-powered cars completed just 151 laps compared to 444 for Ferrari and 875 for Mercedes, while the fastest time by a Renault engine was over five seconds slower than the best Ferrari-engine time and almost seven seconds off the quickest Mercedes-powered lap.Renault Sport F1 deputy managing director (technical) Rob White conceded the engines had not been reliable enough to extract the required performance from them.“We have not run enough laps, and when we have they have not been run at an acceptable performance...
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