Nash won race two at the Salzburgring in his Chevrolet Cruze to give bamboo-engineering their first win in the series.
"The victory has finally come," the driver, who was second in race one, said. "I had to work for it, though – Norbi [Michelisz] didn’t let me go and so it became a case of managing the gap and the tyres.
"Over the last few laps, with Yvan [Muller] approaching pretty quickly I started to lean on my tyres and made a few errors.
"I’m a bit disappointed with that, but we had a big enough gap and so we were able to keep it together. When he passed Norbi, for the first time I looked at how many laps there were to go.
"I always have high expectations of myself and I know what the car is capable of. I’m not achieving the capabilities of the car and that’s down to me and I really need to get to grips with it.
"This win today has given the confidence to move forward and look at my ability and I know I can do it."
Michel Nykjær hailed his "perfect race" in winning the opening contest on Sunday.
"It was nice, a perfect race for me," he said. "James was always right behind me in the slipstream and every time we came to Turn 9 he was right on my bumper, but I managed to block him.
"I’m always a little bit nervous on this track because of the tyres but we managed to pass the finish line in first place and so my second victory this year is fantastic for both me and the team.
"It’s going to be tough this season between me and James in the Yokohama Trophy, but I’m hoping to be near the top each time to pick up points and that’s how you win a championship.
"It’s going to be difficult to beat Muller and [Gabriele] Tarquini, but we will try. I just hope to be able to take the trophy at the end of the season."
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