Toro Rosso technical director James Key says his team has a "heavy responsibility" to help its engine partner Honda make progress this year.
The new partnership was born out of McLaren's decision to split with Honda last year and has made Toro Rosso a works team for the first time in its 13-year history. During its first week of testing the new partnership resulted in a marked improvement for Honda over the last three years of its turbo-hybrid project, with no major engine failures and the most mileage of any team.
Toro Rosso has completely revised its gearbox and the rear of its chassis to accommodate the Honda power unit, which requires different packaging to the Renault due to its split-turbo design.