Daniel Ricciardo believes McLaren took a step forward during the second practice session on Friday, but he knows more is needed if he is to deliver in qualifying on Saturday.
The Australian could only manage the 14th fastest time in the morning and followed it up with the 15th fastest time in the afternoon. Ricciardo believes McLaren have addressed some of the issues that plagued him earlier in the day, but he knows things don't look good on paper at this time.
"I don't think it was the aero package or anything," Ricciardo told RacingNews365.com and other members of the media. "I think this morning I struggled just getting comfortable, so I was always a bit off and just chasing some rear grip, not really having the confidence to push it.
"I think we addressed it this afternoon. I do think the car was better and we made a step. Clearly a step is not enough and we've got to make another one. On paper it doesn't look great but it certainly was better this afternoon."
Ricciardo made a surprise exit in Q1 during qualifying for the Portuguese Grand Prix, and he knows he needs to find more pace to avoid a similar fate in Spain given how close the grid is.
"We were 15th but I think it's a second to first, so it's so close," Ricciardo continued. "It just shows you know F1 is very close this year amongst all teams, but it's a track everyone knows so well so it's just those small margins.
"We certainly got to go to find some more tomorrow because if we're a second off, we might be back here. So certainly some tenths to find."