https://sportiva.shueisha.co.jp/clm/mot ... ndex_3.php
HRD sakura boss Asaki think Honda's spec4 power unit is very close to Mercedes now.
"The combustion concept we found in last year's spec3 has evolved to this year's spec3,the spec4 is also its extension. Its not the end,there is still room for improvement.The target was to be equal to Mercedes this year. We dont have a clear image in qualifying this time so i dont know yet,but I think that the possibility is not zero with this spec 4."
Hope they can fix the rev limiter problem soon.