Williams chief engineer Rod Nelson believes the Grove outfit will have a reliable car in the 2014 Formula One season, although he admitted that he is unsure about the car's race pace.
Williams has been one of the surprise packages during pre-season, with both Felipe Massa and Valtteri Bottas challenging title favourites Mercedes for pace at Jerez and Sakhir.
"I think it is more a reflection of our determination to have a good solid reliable car, and we are absolutely determined that that was going to be the case.
Touch wood that will carry on," Nelson told Autosport when asked about the team's table-topping pace in Bahrain over the weekend.
"We lost a day in Jerez, and lost a day here [in Bahrain] last week and we know that it will be pivotal to be as reliable as it can be.
"It wasn't any braveness or bluster of anything. It is just we had our homework to do and I wasn't going to sleep until we'd done it.
"We will have to see.
"Everyone else could be running 20kg of fuel and we would look stupid in Australia - I would rather wait."
Nevertheless, Nelson refused to be drawn into discussions about possible targets for the Australian Grand Prix, even though the FW36 car has performed admirably throughout winter testing.
"I wouldn't say that [I'd be disappointed by a non-points scoring finish]. I say we will do the best job that we possibly can," he continued.
"If we can look ourselves in the mirror and say we did the best job we could, we should be happy with that."