Williams has not won a race since 2004, but its winter testing times were ferociously fast.
Winter testing has indicated that 2010 could mark a return to challenge for the title for the Italian team.
The Formula One teams had also planned to hold a winter testing session in Bahrain next week.
Fernando Alonso of Spain and McLaren Honda receives medical assistance after crashing during day four of Formula One Winter Testing at Circuit de Catalunya on February 22, 2015 in Montmelo, Spain.
It was reasonably fast in winter testing.
Winter testing starts on Feb. 5 in Spain.
Now, however, they appeared to be behind in winter testing and admitted problems with the car.
If so, they win the Golden Sandbag for downplaying their winter testing performance.
The new car looked good in winter testing, and Ross Brawn, the director, is optimistic.
Through the winter testing, the new car was frequently at the top of the time sheets.
During winter testing, Raikkonen set the fastest lap time of all the cars and drivers.
