Sauber driver Esteban Gutierrez says he is enjoying the feel of the new power units after he completed his running in the first test at Jerez.
Gutierrez conducted 53 laps at the Spanish circuit on Wednesday and says that he was enjoying the feel of the turbo.
"It's more enjoyable, more power, I'm enjoying the way the turbo feels and it’s interesting," he said.
"[There's] a lot more range [on the gearbox]: you can either use second or third in a corner, you can early shift and still get the power."
Gutierrez said that rear brake issues restricted his effort slightly but emphasised that it was important for Sauber to get substantial mileage.
"The [rear] brakes are a little tricky, we are having some issues there. We know where the problem is and to find a solution but we still need more mileage to get everything sorted."
"Overall its not very consistent, it caught me by surprise and I went off track," he said, referring to his spin into the gravel during the morning session.
"After that I kept running as it was important to get the mileage on the car, I wasn’t able to get the full feeling but the mileage is important."
"We are focusing ourselves on the new systems, the ERS [the Energy Recovery System], the priority is to manage [it], this is what we achieved today and we did a good amount of laps."
"Obviously it’s hard to really speak about the car in general [as] there’s a lot of aerodynamic parts missing still so to say about the car balance is difficult and we are having some issues we need to solve. We are pleased to look at them right now and to find a solution to what is coming next."
Gutierrez will hand over driving duties to Adrian Sutil for the remainder of the test.