Australian Webber spent two years with Williams

The Australian spent two unhappy years with Williams, who have endured poor results recently and have changed to Toyota engines for this season.

"There will be denials but there is a feeling that a B team is how it is," he told the Sydney Morning Herald.

"They'll work hard to beat Toyota, but Toyota in Japan will prefer any success to come to the factory team."

There's no real reason why the results should be any different for them this year Mark Webber

Williams finished a distant eighth in the 2006 constructors' championship, with team chief Patrick Head admitting he was "ashamed" of their performance.

One of the few highlights was the emergence of driver Nico Rosberg, and this season he will be partnered by Alexander Wurz, instead of Webber.

But Webber said he did not expect too much of a change of fortune for his former team.

"They might have new engines, but not a lot has changed in the structure," he said.

"There's no real reason why the results should be any different for them this year.

"I thought I would go to Williams and then finish my career at Williams.

"But it was a tough gig for the credibility of a lot of people. That's what happens when there's such a huge drop in form."