Felipe Massa says he's unsure why Williams suffered with poor race pace at the Hungaroring but is confident the team can limit it to a one-off.

The Brazilian driver endured a race to forget at the Hungaroring after struggling off the line and falling behind the midfield bunch to eventually finish a disappointing 12th.

Massa, who challenged for victory at Silverstone, was handed a five second time penalty for failing to line up in his grid slot properly - explaining he couldn't see his starter marker - which then forced a second formation lap. It went from bad to worse for the experienced driver who spluttered when the lights went out and slipped down the order.

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Despite his poor start Massa was unable to give a confident answer about why his Williams car couldn't fight back through the pack.

"The pace was really, really bad and I don't know why," Massa said. "Behind the traffic with the prime tyres I couldn't drive at all and was missing overall grip in the car.

"Then maybe the best stint was maybe the last one with the option tyres but even with that I was not quick. It was disappointing to see that we were not on the pace.

"I think something was not making the tyres work in the race, maybe the temperatures I don't know, we were out of the range."