Sunday, June 20, 2004
Williams adopted a medium-downforce configuration adding the full-width additional wing on top of the rear axle, as seen in previous races. According to their engineers, impact on straight-line speed was minimal. The team also increased chimney size due to the humidity and high temperatures at Indianapolis.
As seen in Canada, a single-element front wing, to keep drag low, but this time with the addition of a saw-tooth profiled flap to add downforce. The additional cuts into the outer rear edge of the wing element improved airflow close to the endplates, reducing drag on the straights.