Red Bull managed just 21 laps at Jerez. Red Bull/Getty Images
Renault's technical deputy managing director Rob White has conceded that the French's company's performance at the Jerez test was not acceptable.
The three teams powered by Renault at Jerez managed just 151 laps, compared to the 444 completed by rivals Ferrari and 875 by Mercedes powered outfits.
Renault's cars were also significantly off the pace, with Jean-Eric Vergne's time of 1.29.915s being their fastest time of the week, some 6.6s slower than Thursday pacesetter Kevin Magnussen.
"We have not run enough laps, and when we have they have not been run at an acceptable performance level," said White.
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