Robin Frijns says his inaugural Friday practice when as planned as he completed the full program that Caterham had asked of him.
The 22-year-old was in action for Caterham in Friday's first practice for the Bahrain Grand Prix and complete 35 laps.
His best time for the session, a 1:42.417, was three-tenths quicker than regular driver Marcus Ericsson with Frijns revealing that the car had progressed since he last ran it in the pre-season.
"It was good to get my first FP1 done, and especially good for the team that we had our first problem free first practice session of the season so far," Frijns said.
"35 laps is exactly what we'd targeted and we completed a program that was all about preparing for Sunday, working with Renault on the power unit and not really looking at times.
"The car felt better balanced than the last time I drove it here in Bahrain in the pre-season test, and it's clear that Renault have made a lot of progress since then - we showed in last week's race in Malaysia that our race pace is strong and I think the work we've done today will help us build on that in Sunday's race.
"There's clearly performance to come from optimising the setup and more work with Renault, but I've done my bit today and I'm happy with what we did."
The Dutch driver will be back on the car on Tuesday when F1 begins a two-day test at the Sakhir circuit.
He added: "I'm back in the car again on Tuesday for the first day of the test when we're working with Pirelli, and if we can have similar reliability then I think we can help them and us make some more good progress."