Quote:
|
Originally Posted by bwilson4web
I agree. The O(2) sensor and exhaust temperature gage should be controlling the mixture. As for timing, I would expect RPM to be the primary determinant.
<snipped>
Living about 700-800 ft. above sea level, more power doesn't help me and would have a negitive impact on MPG. If I lived in the high plains or a mountainous area, I'd be more interested in supercharging and valving changes.
Bob Wilson
|
exactly, Bob... when i first took my Prius to high altitude, (and after i understood the difference between compression ratio and expansion ratio
), i wondered why the TMC engineers didn't make it possible to just close the intake valves 'way earlier when the maximum intake charge was lower density; i.e., at high altitude.
now, i just assume that there's a range where this is feasible for changing the valve timing, and the high altitude rationale just doesn't fit in. if so, so be it.
but, again, an electric supercharger that would pump the intake flow "all the way up to" sea-level pressure certainly couldn't hurt the engine, though it obviously would affect gas mileage.... if you're at high altitude, and there's less air per intake stroke, and the fuel/sir ratio stays within narrow bounds, adding more air would result in more fuel. performance might go up, but mpgs would almost of necessity and physics, drop.
though the tradeoff might be nice...
or how about another dash switch...
