AFR change in summer??
06-20-2014, 12:27 PM
#1
Staging Lane
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AFR change in summer?? Just a few weeks ago i had my afr reading12.6 12.7 wot now For some reason its leaned out to 14.3 14.6 im wondering if the heat/humity change could have something to do.with it. Do i need to adjust my PE tables to add fuel because of the temp diffrence. Its like 98+degrees out now with high humidty im thinking it may have something to do with afr being lean. Please help. Pump is walboro 255 not more than 3months old hardly ever got below 1/4 tank maybe 1 or 2 times for short period of time. Afr is still 15.0 15.8 at idle.
06-22-2014, 06:07 PM
#3
Intake air temps will affect AFR, but it's usually means the other way...as in richer AFRs during the summer and leaner in the winter. But even then it's a negligeable amount.
What you're experiencing sounds like a fuel delivery problem if you all of a sudden went from mid 12s to 14s at WOT. That is not because of the air being hotter outside.
What you're experiencing sounds like a fuel delivery problem if you all of a sudden went from mid 12s to 14s at WOT. That is not because of the air being hotter outside.
06-24-2014, 08:41 PM
#4
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No didnt notice any change in anything that would make me think its starving for fuel. Crusing around it still stays in the 14.8 15.5 range, Just wot has changed. The last time i dailed in my WOT afr was with a mixture of 110 &93 octane (Majority 110) for nitrous purposes and it was at 12.6 12.7. Now im thinking since all the 110 is gone and its on 93 would that have leaned it out that much?
