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Old 01-23-2013, 04:39 PM   #7 (permalink)
RobertISaar
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Join Date: Jul 2012
Location: camden, MI
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MC SBX - '95 Chevrolet Monte Carlo LS
Last 3: 29.75 mpg (US)
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because i know what my injectors are rated for in lb/hr, no idea what they're rated for in volume/hr.

what i entered:

7*(1/3,600,000)*16.36*2*2263*60*1

2 because with a modern 4-cylinder, it's SFI and will fire 2 injectors per revolution(since a 4 stroke cycle takes 2 revolutions).
1 because it's SFI and only fires the injectors once per 4-stroke cycle.

makes 8.6386 Lb/Hr

/6.073

makes 1.4225 Gal/Hr

25/1.4225 = 17.5751 MPG


i don't suppose those numbers you stated are average numbers? or are they just a single frame of data? for some reason, i can never get this equation to work correctly with averages... works perfect with single-sample data though.

anyways, 17.5MPG at 25MPH with an estimated 17.5% throttle position(based off of .5 volts being idle and 4.5 volts being WOT), seems believable.
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