Toro Rosso believes that the Honda engine is close to Renault's performance of the former engine supplier and that the Japanese manufacturer will close the gap when it comes in mid-2018.
The engine supplier change between Toro Rosso and McLaren is believed to be 20 times higher than the ninth in the championship last year. The reason is that Renault's power unit is the best after Mercedes and Ferrari.
However, Toro Rosso technical boss James Key said the team was very pleased with Honda's performance and was surprised in a positive sense.
Key also noted that the performance gap between Honda and Renault was less than expected.
Speaking to Sky Sports, Key said, "I do not know what Renault is doing this year, but we thought last year that Renault was good, and it's not too far away, as we all know from the numbers you need to look carefully every time."
"There is no serious difference as it was last year, and it was even closer at the end of the season, as Honda stepped forward this year and this is a promising development." said.
Honda had suffered from performance and endurance difficulties for three years with McLaren, and as a result, McLaren had to cancel a profitable contract.
Key believes that the Japanese manufacturer has maintained its performance at the end of last season and that it will close the gap with Renault.
"Despite all the problems they experienced in the first half of the year, they had the capacity to make the right development at the end of the season, and this trend continues this year, and as long as it continues, there is no reason not to have caught Renault in the middle of the season."
For one of F1's smallest teams, Honda has given up one of its biggest teams, and Toro Rosso's approach to Honda gives its results.
Key, "We really wanted to work with them, our team boss (Franz Toost) knew them well, and I had the opportunity to work with them, and as a result we have a good relationship and understanding."
"We are trying to provide Honda with a free environment, first of all we want to get them the opportunity they need. said.