Quote:
Originally Posted by aerohead
1) If you've altered the drag you've altered the road load horsepower requirement of the vehicle.
2) If the engine is not kept at a constant load, its BSFC will wander to a less efficient 'topographical region' of the engine's 'map.'
3 It doesn't matter if the throttle position, RPM, and stochiometric ratio are constant, you've altered the thermodynamic properties of the engine and they haven't been accounted for.
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All right, it's obvious you don't know much about engines. For example, for a given engine and fuel, the stoichiometric ratio
is a constant! (I think you mean air/fuel ratio.)
Don't worry about it. Maybe try doing some mapping of an engine from scratch, have your own chassis dyno, your own wideband air/fuel ratio meter, etc, etc, and then come back to me.
You know, experience and testing versus just theory (yet again!).