Sauber upgrades ?not working?

Sauber admitted that its lack of performance during the Singapore Grand Prix weekend was due to its latest upgrade package failing to pay off, following a poor qualifying performance. Two weeks after Sergio Perez's near-victory in the Italian Grand Prix , Sauber has been off the pace throughout the Marina Bay weekend. Perez will start 14th, while his team-mate Kamui Kobayashi - who had expected a good weekend - could not make it beyond Q1 and starts 18th

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