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Is it even possible to calculate? If so, how would I go about calculating it? I've already got a OBDII scanner that I built from scratch, so building a MPG calculator shouldn't be too much more difficult, right?
You've built an OBDII scanner eh? Interesting. Is it just a generic code reader? (I'm assuming so) I'm curious, how'd you get the connector for the OBDII port? Or did you just ghetto rig something? :lol: I guess it is possible to create a MPG indicator kinda thing if you were to have it calculate MPG based on speed, throttle position, engine rpm and engine load. But I'd think you'd have to do some testing and benchmarking to come up with a table for comparison, but that seems like alot of work. Just figure it like this, HIGHER RPM = POOR FUEL ECONOMY, LOW RPM = GOOD FUEL ECONOMY. :lol:Originally posted by Nomadic_Dragon@Jun 13 2004, 01:28 AM
Is it even possible to calculate? If so, how would I go about calculating it? I've already got a OBDII scanner that I built from scratch, so building a MPG calculator shouldn't be too much more difficult, right?
There you go. Sell Taurus. Buy Volvo.Originally posted by mikehawk@Jun 13 2004, 10:34 AM
My mom's 02 volvo s60 can tell you instantaeous mpg, average mpg, how many miles till an empty tank, it can download messages from volvo, and it will give you an alert message if a head light or tail light is out, etc, etc, all on this little display screen on the dash. It's pretty cool, you scroll through it with something that looks like windshield washer controllers.
I have no idea how you'd make one for the taurus though.
There you go. Sell Taurus. Buy Volvo. [/b][/quote]Originally posted by eCarâ„¢+Jun 13 2004, 09:38 AM--><table border='0' align='center' width='95%' cellpadding='3' cellspacing='1'><tr><td>QUOTE (eCarâ„¢ @ Jun 13 2004, 09:38 AM)</td></tr><tr><td id='QUOTE'> <!--QuoteBegin-mikehawk@Jun 13 2004, 10:34 AM
My mom's 02 volvo s60 can tell you instantaeous mpg, average mpg, how many miles till an empty tank, it can download messages from volvo, and it will give you an alert message if a head light or tail light is out, etc, etc, all on this little display screen on the dash. It's pretty cool, you scroll through it with something that looks like windshield washer controllers.
I have no idea how you'd make one for the taurus though.
The trip computer is STANDARD on the new TaurusOriginally posted by HenrySel@Jun 13 2004, 08:59 PM
Oh the '04 Taurus does have it as an option, don't think it's that much either. Sell old Taurus, buy new Taurus...
You'd be off anytime the a/f ratio goes rich or lean, which is a lot. WOT, decel, even pressing the accelerator down a bit causes the a/f ratio to go rich for a split second. It's simulating what an accelerator pump used to do for a carbeurator.Originally posted by Nomadic_Dragon@Jun 13 2004, 10:34 PM
I might do that. Sell my '03 Vulcan for a '04 Duratec.But for at least a few more years, its the '03, so I want to get some fun stuff on it.
Here is a question...I know the air/fuel mixture should be 14.7 lbs air per 1 lb fuel. My scanner can read the mass air flow in lbs/min, so I should be able to figure out lbs of gas per minute, figure in vehicle velocity at that moment, to get instantanious MPG. Would this work, or are there other _significant_ variables?
I'm not very familiar with "fuel trim". I thought it was kind of a learned correction factor to compensate for the fact that no two cars are going to be exactly the same (even if they are built with the "exact" same parts).Originally posted by Nomadic_Dragon@Jun 14 2004, 03:29 PM
Might need a good programmer's help, but the way I figure it, we'd just query the ECU for vehicle speed, mass air flow, and fuel trim, every second.