Williams driver Felipe Massa reckons that the FW36 is lacking downforce ahead of this weekend's Malaysian Grand Prix.
Williams has demonstrated good pace in 2014 but Massa revealed in Malaysia that upgrades were not ready in time for the second round of the year.
"We are missing a little bit or rear downforce and we are working on that to improve," said the Brazilian racer.
"Pieces were not ready for this race, so we have the same car, more or less, as we had for Australia. This is a different track so we need to see how the car behaves here, but we are definitely working 100% in the factory to improve. There are some areas we need to improve and I'm sure...
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