Apr.18 (GMM) Pedro de la Rosa qualified just seventeenth in Shanghai.

"We lack top speed," said the Sauber driver.

After innovators McLaren, the Swiss team had been the first to implement an F-duct solution, but it was not running on the C29 in China.

"We had to put the standard wing back on. It worked on Friday but not today," the 39-year-old told Spain's Marca newspaper on Saturday.

After Ferrari, Mercedes and Williams also experimented with F-duct solutions in China, it is expected that the bulk of the remaining established teams - Renault, Red Bull and Force India - could debut wing-stalling systems in Spain next month.

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