The team rented a workshop in Austin leading up to the event to modify its VF-23s to become the final team to converge around the downwash sidepod concept pioneered by Red Bull.
Haas debuted new sidepod inlets, engine cover bodywork and floor for its home race in a bid to address the major in-race tyre wear issue caused by an aerodynamic imbalance.
But the verdict from drivers Kevin Magnussen and Nico Hulkenberg following the Saturday sprint race at the Circuit of the Americas was that progress was not immediately obvious.
Magnussen, who finished 18th following a scrappy battle with Zhou Guanyu, said: “It didn't look too good, honestly. But we'll investigate and see what we think.
“It's just frustrating. [The tyre struggles] looked a little bit similar… It wasn’t a great sprint.
“The pace dropped off a lot… I got a decent start and a decent first lap, then stayed there for a few laps before the well-known cycle of getting overtaken and the tyres dropping off started.”
Source: Autosport