Ferrai admitted that their form was difficult to assess after a "challenging" day of practice at Yas Marina Circuit ahead ot this weekend's Abu Dhabi Grand Prix.
Charles Leclerc and Carlos Sainz concluded the evening session in eighth and ninth respectively, with both drivers suggesting that changes made to the track since last year's event had made it a difficult day.
"I quite like the new layout and it was fun to drive," Leclerc said. The track evolution was quite big over the course of the day, but that’s more down to the temperature as it becomes much cooler here in the evenings.
"This helps us to gain grip," he noted. "Tyre degradation is quite high but I think our car is reacting well to this circuit so far.
"We are lacking a bit there compared to some of our closest competitors and I hope we can put it all together for tomorrow," he admitted.
"In terms of pace, we did a good job with the race simulation and still have a little work to do to prepare for qualifying.
"It’s been a challenging day here in Abu Dhabi," was the summary from Sainz. "The new track layout and surface are making it very different to any other year we’ve driven here in the past.
"It’s been a very difficult Friday because since FP1 I wasn’t feeling at home in the car and I’ve been chasing the balance the whole day. That’s quite unusual.
"We’ve been starting on the right foot pretty much every weekend and today, I feel we have a lot of homework to do, going into Saturday.
"We will now sit down with the engineers, see where we can improve the car and hopefully find more performance for tomorrow."