Tanabe san interview(only part translation of the article )
https://headlines.yahoo.co.jp/hl?a=2019 ... 7-rcg-moto
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――What's the difference between Spec3 and Spec4,how is the improvement?
Tanabe san:Performance and reliability,i think we got a good balance,then we had a power gain,the new Spec engine is something like this.
――The Spec3 is mainly about a upgraded turbo,then some minor modification about ICE.So how is Spec4?
Tanabe san:Neither MGU-H nor Turbo,mainly ICE.
——Does it mean that the combustion efficiency has increased?
Tanabe TD: Improvement of combustion system.
——The reliability improvement is about ICE?
Tanabe san:Yes,as we did with Spec3,our development aims to use the PU as longer as possible when we release its maximum potential.So both performance and reliability must be better than Spec3.The Spec 4 is a reaching point.
——The imprvoment is bigger than Spec3?
Tanabe san:Secret(Smile all over his face).
――Your smile tells everything...
Tanabe san:haha(laugh).The upgrade we bring to this race,(the performance gain)is something we can see with our eyes.
――No new fuels?
Tanabe san:Just unable to introduce new fuels at the same timing.