12-05-2010, 11:11 PM
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#11 (permalink)
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Track Member
Join Date: May 2010
Location: Bay Area
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Quote:
Originally Posted by Nixlimited
I don't understand why you would have to retune a MAF based on different temperatures. One of the reasons OEMs use MAFs is because that type of metering is not temperature sensitive i.e. MAFs take into account the temperature change inherently. The trouble with MAFs on aftermarket setups is typically related to turbulent airflow across the sensor which really f's up the readings.
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the MAF's reads IAT also so that can also be throwing it off a bit. got this off the net:
Air intake temperature is used to correct fuel quantity (pulse width) since air temperature effects air density. (colder air is much more dense) Approximately 70°F is generally used for 0 correction, temperatures above will result in less fuel to compensate for the lower air density, and conversely temperatures below 70° will result in steadily richer (by volume) mixtures. Bad readings will effect ECM attempts to keep the air to fuel ratio proportional.
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