Sebastian Vettel extended his championship lead on Sunday by winning the Malaysian grand prix.
German Vettel's win was despite apparent reliability problems for the KERS system aboard both RB7 cars.
Lewis Hamilton faded in the last part of the race and was further slowed with a hit from behind by Fernando Alonso, but with Button within sight of the winner, McLaren is confident for the coming races.
"We will run a new floor in China on Friday," revealed team boss Martin Whitmarsh.
Said Button: "The step we've made from the last race to here is very impressive."