Zynerji wrote: ↑28 Mar 2018, 20:15
I am interested in anyone's thoughts concerning this idea. Using the VLIM as a pressurised pre-chamber to cause an afterburn after the exhaust valves open could potentially help the spooling of the turbo, and also cause the cackle that only the Honda has.
If "cackle" means that brrr sound on partial throttle, Hasegawa himself answered about it back in 2016 (Mexico GP weekend).
http://www.as-web.jp/motorsports/shots% ... C%E3%81%B5
Here's the relevant part (translation by me)
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------- Also one question from me (photographer Mr Atsuta), when I was taking photos at the entry of a corner, I felt the sound of backfire was particularly loud from Honda engines only?
Current F1 engine is not good at lower speed range, so in such instance you often keep the throttle open bit excessively then cut fuel etc in order to adjust torque, therefore back fire gets bigger for that amount. I think other makers are doing the same too, but we are doing it in particular, more than any others.
-------- Is it about improving pickup or pedal response at lower speed range?
That's correct, you let engine take in a lot of air. Then inject fuel in there as normal/usual, then shift ignition timing, or stop some cylinders, in order to lower/control the output level. By doing that, there is excess/redundant fuel at the timing of mode shifting, which then comes out of / goes into the exhaust pipe.
-------- I remember there was not such thing at USA and Suzuka?
The basics are unchanged, but there are some fluctuations (depending on track characteristics).
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So nothing special, just a way of controlling and maintaining torque at low rpm range. You can hear other engines are sounding same/similar too, Ferrari in particular altho not as blatant or can I say dirty as Honda obviously, even Merc sometimes, Renault not much perhaps.