Re: "Wide Open Throttle"
My knowledge is far from exhaustive (sic!) but on diesel, you maintain a constant air input and modulate the fuel, if its non turbo, and a bit more complex but similar if its blown.
What that means is that the cruise and low power mixture becomes extraordinarily weak. Rather than the full throttle mix rather rich (although that too is a feature of older non turbo diesels that smoke under hard acceleration).
The problems AIUI is that ultra lean burn is desperately good for fuel efficiency and particulate emissions as everything gets burnt, but desperately bad for NOx emissions as even the nitrogen gets 'burnt' ...And there is no currently deployable technological quick fix way out of that. Up the fuel ratio to 'cool' the burn and richen it and you will see more smoke and unburnt fuel.
I am wondering what the implications would be of 11 million cars that can never meet the US emissions regulations.
Biting the hand that feeds IT
