Guest tony78_280z Posted September 10, 2005 Share Posted September 10, 2005 I know all kinds of possible side effects of running lean, but can running lean actualy hurt your gas millage? In my mind it makes sense, but I can't explain how. Supose you set your system to run just a little lean at cruise, it might actualy run better MPG, but if if is more than just a little lean at cruise, wouldn't that hurt milage? Somehow? Maybe a dumb question. And y'all prolly make me feel stupit fer axkin... Please explain how I am correct or incorrect. Thanks Quote Link to comment Share on other sites More sharing options...
Guest bastaad525 Posted September 10, 2005 Share Posted September 10, 2005 it'd have to be excessively lean. For best fuel mileage, you already want to run it pretty lean at cruise, like 14-15:1 air/fuel or even leaner. Running way TOO lean though would cost power, the car would feel sluggish or starved, it might hurt mileage because you'd be into the throttle more just to accelerate lightly, so might result in less mpg's, especially in traffic or going from one light to the next. But I'd be more worried about what it might do to the motor, lean=hot and hot is bad. Quote Link to comment Share on other sites More sharing options...
Guest tony78_280z Posted September 10, 2005 Share Posted September 10, 2005 it'd have to be excessively lean. For best fuel mileage, you already want to run it pretty lean at cruise, like 14-15:1 air/fuel or even leaner. Right, at cruise you'd want slightly less. But too much less? Running way TOO lean though would cost power, the car would feel sluggish or starved, it might hurt mileage because you'd be into the throttle more just to accelerate lightly, so might result in less mpg's, especially in traffic or going from one light to the next. exactly! or to keep at a constant high speed (70mph) cruise. But I'd be more worried about what it might do to the motor, lean=hot and hot is bad.Right, but for this discussion we are not including these problems. Thanks for the reply Quote Link to comment Share on other sites More sharing options...
Guest bastaad525 Posted September 10, 2005 Share Posted September 10, 2005 You might want to check on the Megasquirt section, there's lots of talk there on cruise a/f ratios, I think some people have set it as lean as 17:1 under cruise?? I would think that the lack of power would become obvious as you get leaner and leaner, well before you'd get a real loss of mpg's Quote Link to comment Share on other sites More sharing options...
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