James Calado says he's feeling much more relaxed going into his second season of the FIA World Endurance Championship after revealing his disappointment at the end of last season.

The AF Corse driver returns in the Ferrari 458 Italia in the GTE Pro class alongside co-driver Davide Rigon and with 12 months of endurance racing under his belt, the British driver is brimming with confidence ahead of the 2015 season opener at Silverstone.

"I feel more relaxed this year," Calado told Crash.net. "Every time I get in the car now everything is in slow-motion and I'm much more in control and not the other way around."

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The 25-year-old Briton made the switch from single-seater racing to sportscars last year after finishing third in the GP2 series with ART Grand Prix. Calado combined his GP2 season as Force India's Formula 1 test driver, but after failing to secure a full-time F1 race seat in 2014, he made the bold switch into the World Endurance Championship with AF Corse.

The Cropthorne-born driver says getting used to the switch took more time than he anticipated at the start of last year which he feels had an impact on his performances.

"I was quite disappointed with last season despite my positive attitude at the end of last season," Calado said. "I think I underestimated the jump between single seaters and jumping into GT and endurance racing. The car is so different to drive and the mentality of an endurance racer is also completely different."

Calado was forced to sit out the Le Mans 24 Hours race after suffering a heavy shunt during qualifying, with FIA medics declaring him unfit to drive.

"Naturally it took time for me to adapt and as a consequence I had my accident at Le Mans which cost us a lot of points. But since then in the last four races we were on the podium and were very strong and competitive."

Looking ahead to the new season the AF Corse driver says he better prepared for the tests of endurance racing with a year of experience and is aiming for the GTE Pro driver's title.

"I feel really happy with everything and hope we can retain our championships and do a good job for Ferrari this year," he added. "In the off-season my engineers and I have had a great winter at in the tests we seem to have found some performance from the chassis, the car and ourselves. We head into 2015 in much better shape."