Sauber pair Sergio Perez and Kamui Kobayashi both struggled today during practice for the Hungarian Grand Prix.

Kobayashi was only twelfth this morning in P1 on a 1 minute 24.394 seconds, and while he improved by around half a second this afternoon, he dropped down the order, finishing up 15th overall in the rain hit P2.

"The weather today was a kind of surprise. We had such a packed programme and I really would have preferred two dry sessions, because we still have a lot of work to do," the Japanese driver lamented. "For some reason we struggled in the morning. We don't understand our poor performance in dry conditions yet and have to investigate that.

"We were fast on the wet track but I think that is not worth anything when I look at the weather forecast."

Perez meanwhile also had a tough day and while he was slightly quicker this morning and posted the tenth best time, he couldn't improve in the afternoon in part because of a technical problem and then because of the rain, which arrived mid-session.

"It was a difficult day," he said. "I am not happy yet with my car. We need to look at the data now and we need a good third free practice session tomorrow. However, on the time sheets it looked particularly bad for me in FP2 because I didn't manage to go out on soft tyres after a brake problem needed to be fixed in the garage."

"Overall there's quite a lot of work for us to do with regard to performance as well as reliability," summarised Sauber's head of track engineering, Giampaolo Dall'Ara. "We had some reliability issues on Sergio's car, which cost him some running time.

"In completely dry conditions we are definitely not where we want to be with regard to the lap time, so we have to analyse all the data tonight and draw the right conclusions."

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