Williams will evaluate a new front wing and diffuser changes in Friday practice at the Singapore Grand Prix as it strives to improve its performance.
The team is currently ninth in the constructors' championship, with just three points finishes to its name all season. Rubens Barrichello's ninth places in Monaco and Canada are its best results of 2011 so far.
Technical director Sam Michael will leave the team after Singapore, ready for a new role as McLaren's sporting director from 2012. He said Williams was continuing to push forward with developments to try and get out of its current plight.
"We have an upgraded diffuser and a new front wing assembly for the first of the flyaways," he said. "We'll test both of them on Friday."
Pastor Maldonado was able to run sixth in the last race at Monza following a fast start and a safe passage through the first-corner collision. But his pace was not strong enough to hang on to that position and he fell to 11th. He hopes that the revised car will allow him to be more competitive in Singapore - especially as he has a reputation as a street circuit specialist.
"I really like street circuits so I think I can be quick there," said Maldonado.
"We have some upgrades for this race that we hope will be a big improvement and help us better our last result."