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Old 01-15-2013, 02:59 PM   #217 (permalink)
christofoo
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Join Date: Mar 2012
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00C - '00 Toyota Corolla
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Quote:
Originally Posted by RobertISaar View Post
how does the scanguage calculate fuel economy?

two possible methods, one of which is significantly better than the other but requires more information.

method 1 is estimating fuel injected based on airflow readings from the MAF sensor and the target air/fuel ratio.

method 2 is calculating fuel injected based on injector pulsewidth, RPM, injector flowrate, number of injectors and injection scheme to create a fuel flowrate in gallons per hour.

guess which one is more accurate?
Scangauge uses MAF. MPGuino uses injector pulsewidth, and is more accurate generally, and significantly more accurate on lean-burn engines.
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