Auto GP organizers declared the initial run of its revised 2013 car a success after its first day of testing at Barcelona.
In addition to the 2013 Auto GP car's raw speed, personnel at car builder's Coloni Motorsport expressed satisfaction with reliability as the new machine completed 42 laps without problem.
"I'm very satisfied with what we saw on track today," said series boss Enzo Coloni. "The 2013 car proved fast, as we expected, and we were able to test different components.
"We will be back developing it tomorrow. As we evaluate the improvement, we must also consider the weather conditions. The cold weather made the track about two seconds slower than usual."
The new car is based on this year's Lola-Zytek V8, which formed the basis of the last-generation F3000 machine and the A1GP racer, but features updated sidepods and front and rear aerodynamics. Series officials expect lap times to be improved by around 1.5 seconds.
Reigning champion Adrian Quaife-Hobbs set the fastest lap of the day on 1m32.857s, 1.182 seconds quicker than the best time recorded by the outgoing model during Thursday's collective test.
In his first experience of an Auto GP car, former Formula Renault 3.5 racer Vittorio Ghirelli was quickest among drivers in 2012-spec machinery during the collective test.
Virtuosi UK, which ran Pal Varhaug to the runner-up position in the 2012 series, assisted experienced Formula 3 man Andrea Roda in adapting to the additional horsepower of Auto GP machinery.
Antonio Spavone will aim for an improved showing on Friday, after suffering fatigue in the latter stages of the afternoon. The Italian arrived at Barcelona extremely late on Wednesday after his flight from Britain was delayed by snowfall. Italian Formula Renault Challenge driver Luca Defendi also conducted his first Auto GP test with Ombra.
Auto GP announced a x-race 2013 schedule last month that dropped this year's events in the U.S. and Brazil in favor of a Euro-centric calendar.