Honda insists they face no serious problems with their engine and will only make small changes after testing.
The Japanese manufacturer enjoyed their most productive Formula 1 pre-season since returning in 2015 as both Red Bull and Toro Rosso ran flawlessly from a power unit perspective over the eight days.
Despite that, F1 technical director Toyoharu Tanabe confirmed the situation was not perfect ahead of the first race.
“We don’t have a serious problem with the current installation, but we found some issues because of the tight packaging,” he told Autosport, referring to the very narrow rear-end on both Red Bull cars.
“The shape was a little bit too aggressive, so we need to make it a little bit different. It’s not a big concern.”
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While both Red Bull and Toro Rosso have heaped praise on their engine supplier, Tanabe won’t accept it until they close the gap to Mercedes and Ferrari.
“[I’m] never happy, actually!” he said of the improvements. “Of course we have a target and a target through the year as well.
“We are not so confident with the current achievement [as there is] still a lot of areas we need to work on to catch up to the top competitors.”
