Williams has promised not to get carried away and believes it can challenge for wins at every track now, despite Pastor Maldonado's dominant performance at the Spanish Grand Prix.
The Grove-based outfit ended an eight-year victory drought at the Circuit de Catalunya, with Maldonado brilliantly holding off Fernando Alonso for his maiden F1 triumph.
But despite strong performances at the Barcelona track often being an indicator that a car will be good for the remainder of the campaign, Williams thinks the unpredictable nature of this season means there is no guarantee or more success in the future.
Williams board member Toto Wolff told AUTOSPORT: "I can get used to this kind of stuff, I like it. But I think we cannot expect results like this to happen on every occasion, or that we will be there now as a top contender.
"We have seen Sauber run very competitively in Malaysia, and we have seen [Nico] Rosberg having a tremendous race [in China], while here it was us. So it is a tricky situation which the engineers need to understand.
"But it definitely gives the team a boost of confidence and a boost of motivation. It is going to boost Pastor and it will boost Bruno [Senna]. So let's live with the euphoria now before we go back to work."
Wolff, who is playing a more active role at the team following the departure of chairman Adam Parr recently, says the team never expected to be so strong when it arrived at the Spanish GP.
"If you are realistic you cannot dream of the victory," he said. "We have seen that various teams won various races, and you see the Mercedes has gone up and down.
"Whether it is about finding the right window for the tyres to work, or if it is a combination of other things, it is still to be analysed.
"But I didn't dream about the win, and I didn't dream about it after qualifying either. Our aim was to keep it calm and score solid points. This is what Pastor's target was in the morning, so he was not going flat out and crazy for the win."