The Japanese squad are testing a new suspension and a new aero package which was built to wrap around suspension.
The team are also running a shark fin engine cover.
Barrichello said after testing on Thursday that the upgrades were a step forward, but not very significant.
"The new aero package seems to be on the better side of the other one, although it's very, very difficult to understand fully because it's just too hot after the first run," Barrichello told autosport.com.
"The engine cover is just a plus and I think it will work on different tracks. It doesn't mean a lot for certain tracks.
"The new suspension is also an improvement, although not as big as we thought. But everything was a bit better. But slightly, not much."
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