Yu Kanamaru was fastest during the first morning session of Formula 3.5 V8 post-season test, the first since parting ways with Renault this week.
The new championship, which is still endorsed by RPM Racing, made its début with the Japanese driver leading the way. Kanamaru became a regular fixture in the final FR3.5 season, competing with Pons Racing but set a fastest lap for the first time this morning over the twists and turns of the Spanish circuit, Jerez.
Newly-crowned Formula Renault 2.0 Eurocup champion Jack Aitken was second fastest at the helm of his Fortec Motorsports challenger with Matthieu Vaxiviere third. The Frenchman is competing with new team Spirit of Race but is not expected to sign a contract for the 2016 season.
Strakka Racing duo Jake Hughes and 2015 series regular Gustav Malja were fourth and fifth respectively while FR2.0 NEC champion Louis Deletraz was sixth in the second Fortec. Russian racer Matevos Isaakyan was seventh for Pons Racing with Alfonso Celis Jr, Nikita Zloblin and Egor Orudzhev completing the top ten.
Meanwhile former BRDC McLaren winner George Russell was 12th for French outfit Tech 1 Racing.