Jul.5 (GMM) Sauber must improve its qualifying pace, team boss Peter Sauber insists.

The two C29s qualified poorly at Valencia a week ago, but in the race Kamui Kobayashi featured strongly and his teammate Pedro de la Rosa also finished in the points.

"So the crucial question for our team is: why is the car fast in the race but too slow in qualifying?" Sauber wrote in a column for the Swiss Sunday newspaper Sonntagsblick.

"Our engineers as well as the drivers need to get to the bottom of this as fast as possible," he added.

Sauber said the Ferrari-powered C29 has "much potential" that only works "within a very narrow window".

A new aerodynamic package debuted in Valencia, and de la Rosa thinks the car will work even better at fast Silverstone this weekend.

"I'm very much looking forward to the British grand prix," said the Spaniard.

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