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Calculating MPG

 
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cbernhardt



Joined: 18 Apr 2008
Posts: 84

PostPosted: Sat Jul 11, 2009 5:45 am    Post subject: Calculating MPG Reply with quote

I am using ScannerPro 5.0581 with an MEFI4a controller (GM Ram Jet 350 crate engine). I am able to read instantaneous fuel consumption in gallons per hour directly from the controller. There is also provision for reading the vehicle speed in miles per hour, but I do not yet have a vehicle speed sensor connected. Assuming that I could successfully connect a VSS, is there a way to create a new ScannerPro item that will calculate and display miles per gallon?

Thanks,
Charles
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JP86SS



Joined: 22 Apr 2004
Posts: 217
Location: Strongsville, Ohio

PostPosted: Mon Jul 27, 2009 6:25 pm    Post subject: Reply with quote

There is a calculation in Mark's $6E that I used in the S_AUJP V4 Definition. Either one can show you how.
If you make a constant for "injector size" you can do the calc.

It doesn't account for the voltage correction to PW done by hardware but is fairly close.
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cbernhardt



Joined: 18 Apr 2008
Posts: 84

PostPosted: Tue Jul 28, 2009 2:07 am    Post subject: Reply with quote

Thanks for the reply. I was able to successfully connect the VSS to my Ram Jet controller so I now have a vehicle speed reading. The controller already has a readout for gallons per hour, so all I had to do was create an MPG item that consisted of the vehicle speed divided by the GPH.

Charles
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