How about that massive lean area (stoichiometric) from tip-in to 3500/3900 rpms? Obviously this is intentional, but the first time I've seen it! Wonder what the reasoning is.
Manufactured are targeting the best fuel economy they can get... and that's the trick. Being able to run a turbo, which can give more hp per liter, but at the same time, not having the side effect of having to run a richer mixture which would normally decrease mpg. Typically turbo cars are 11.5:1 air-fuel ratio, and Natural Aspirated cars are 13:1 air-fuel ratio. There are a ton of technologies that are being used, including and most importantly, direct injection, to be able run a lean mixture (like as if it was NA) and use a small turbo engine (insteadof a 4cyl, v6, larger displacement, etc). What you want to avoid is overheating the combustion chamber to the point of damage, and keep it as lean as possible for the best mpg. Honda puts the exhaust manifold internal to the head to quickly cool the exhaust charge, with cooling jackets/water passages... which helps cool the engine, run a leaner mix, and simplify the turbo mounting. On the G16E, the turbo is part of the manifold, and that brings in the heat also so it can be cooled, among other tricks so that they can run as lean as possible... As a tuner, that looks scary to be that lean, and once tuned we find that, sure it's safe, but there is more power to be had by running the 11.5:1 air fuel ratio.
Not bad at all, comes out to about 18%. I’ll be curious about that also. I know a lot of guys seem to use the syvec controller and run it fully fwd or rwd
From my understanding, you don't need any kind of controller/engine management, [once on a 2wheel dyno] just pull the parking brake and go. I'm sure Toyota did this for ease of towing (look this up in the owners manual, under "how to tow"). Motive garage also stated that they pulled "the plugs" under the back seat, which I think they meant electrical connectors... and that's just as an extra precaution.
My guess is to also squeeze out some fuel economy.
Yup!