Quote:
Originally Posted by KamperBob
Usually thinner air at elevation leads to richer mixture and less efficient. The rule I recall is a normally aspirated engine loses 2% max power per 1000' elevation. So 6500' should pay a 13% handicap compared to sea level by all rights. Then again, maybe you know something others don't... 
Cheers
KB |
Quote:
Originally Posted by winkosmosis
The engine adjusts gas according to how much air is going in though... not volume but actual mass... right? That's the basis for hot air intakes.
When I had a Grand Cherokee I got much higher gas mileage driving around Montana and Wyoming than Texas.
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The way I understand it is that the closed loop mode is called closed loop because it uses sensors to get feedback on the A/F ratio, among other things. That is the main purpose of the oxygen sensor. It lets the ECU know how close to stoich it is running, so it can correct the amount of fuel injected. (sorry, I had to explain)
Thus, if you take an engine up high, with low air pressure, there will be less oxygen and the O2 sensor will pick up on it, then the ECU will just put in less fuel. This argument only holds true for fuel injection (and electronic at that) because a carburetor doesn't adjust itself
