A/F ratio and high altitude
02-21-2003, 03:55 PM
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Staging Lane
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A/F ratio and high altitude What is the effect of high altitude (5,000+ ft.) on A/F ratio?
Common sense tells me that because the air is less dense (less oxygen) that it would cause a car to run more rich.
Or does the pcm "re-learn" when going from low to high altitude keeping the A/F the same as before?
Common sense tells me that because the air is less dense (less oxygen) that it would cause a car to run more rich.
Or does the pcm "re-learn" when going from low to high altitude keeping the A/F the same as before?
02-21-2003, 05:13 PM
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Staging Lane
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Re: A/F ratio and high altitude </font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by jimmyblue:
<strong> MAF measures the true amount of air intake so
first order, it doesn't matter. This is unlike
carbs. </strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">So when moving from IA (1200 ft) to CO (5000 ft) the MAF can tell there is less air and adjusts the amount of fuel accordingly therefore keeping the A/F the same?
<strong> MAF measures the true amount of air intake so
first order, it doesn't matter. This is unlike
carbs. </strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">So when moving from IA (1200 ft) to CO (5000 ft) the MAF can tell there is less air and adjusts the amount of fuel accordingly therefore keeping the A/F the same?
02-22-2003, 02:43 PM
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Re: A/F ratio and high altitude PCM takes care of A/F ratio at least at stock levels. Also because of the altitude and making less power we don't max out things like injectors quite so easy <img border="0" title="" alt="[Frown]" src="gr_sad.gif" />
