Nico Rosberg is demanding answers from his Mercedes team at the lack of information he received during the Malaysian Grand Prix, in which he finished third.
Rosberg was critical about the level of understanding he was given during the race, although that has been restricted by recent rules changes over what drivers can be told during races.
"The engineers are not in the racecar, and they have their computer and their wonderful numbers and everything, and I have nothing, so I just struggle to understand what's going on," said Rosberg.
"Even for motivation for the head, you know, to stay on it, it's important to have some details and I was missing that a little bit in the race today.
"We need to see what can be done there so I can have a bit of a better picture of what's going on."
Rosberg was especially critical of the stint when he took the hard tyre, compared to Hamilton on the medium.
"For example, I didn't understand straight at the first pitstop, I was closing on Lewis at some point, and then we made a pitstop, and I never saw him again and he disappeared into the distance.
"And how's that for motivation? That's not very good.
"Then it turns out he was on a different tyre, which I didn't know, so we need to look into all these things."