GP2 front runner Romain Grosjean continued the development work with the new GP3 car this week during a two-day test session at Le Castellet in the South of France.
Following a successful shakedown two weeks ago, the Frenchman spent the first day concentrating mainly on engine performance and 'implementing measures' while the second day was focused on tyre testing.
He completed 61 laps on day two on the 3D configuration track without problem.
"I am very glad that I can pursue this development task," said Grosjean. "Once more, I have been impressed by the reliability and the overall performance of this new car.
"The completed programme has given us enough data to prepare the next step. There is still some work to be done, mainly regarding understanding the tyres even better, but we are definitely working in the right direction. The GP3 car is already safe, fast and reliable."
Technical director Didier Perrin meanwhile was also pleased with the progress made during the test and hailed it another step in the right direction.
"After a trouble-free first day, we could really work on the performance of the car in race conditions," he added. "We started with a qualifying session followed by a race simulation. It was a fruitful session: a satisfying set-up of the car now enables us to start working on tyre testing with Pirelli.
"Our next step is to calibrate the performance of our car compared to a F3, our benchmark. As we will be testing at an extremely demanding track for the tyres, it will help us understand better how to use the compounds to their fullest."