Quote:
Originally Posted by SiVX
So lean burn does not do this? If that is the case then why do WAI on the VX give us better FE? I would think the O2 is seeing "less" oxygen, thus reducing fuel... I am new to alot of the theory tho.
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Here is how I have come to understand the workings of a WAI (though this is off thread topic... but okay). The volume of the intake air increases because it is warmer and expanded, but it's lower O2 content relative to volume makes the ECU adjust the fuel downward by shortening the injector pulses. What saves fuel is the fact that in order to get the same power you need to open the throttle more, reducing your parasitic losses due to the engine's need to pump in air through the throttle. You are reducing so-called "pumping losses" and not really leaning-out the air fuel mix. That's the theory I have seen. But my car, on the freeway, runs very lean when I pulse and glide with the engine-on. I think that is partly about my ignition timing advance.