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post #11 of (permalink) Old 11-22-2002, 10:28 PM
Mud in my Veins
 
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Re: mpg gauge?

That's what they use on factory economy gauges - just a vac gauge of some sort. The $6 mechanical one I got from JCW has markings for mileage on it, but the're pretty meaningless - it's good for showing how far open the throttle plates are, which is a good indication of your mileage.

If you wanted to do a true electronic one, you'd have to have 2 flow meters - one to see how much fuel was going to the rail and one to see how much was being returned to the tank. [img]images/graemlins/wink.gif[/img] Remember, EFIs use a looped fuel system.
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post #12 of (permalink) Old 11-22-2002, 11:20 PM
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Re: mpg gauge?

</font><blockquote><font class="small">In reply to:</font><hr />
Remember, EFIs use a looped fuel system

[/ QUOTE ]
Thats why I was thinking you would need to measure the pulse width &amp; fuel pressure. I didn't think of measuring the fuel in the return line and subtracting it from the fuel in the feed line. How much would an inline "fuel flow meter" be? And what type of signal would it send? Analog sygnals suck because the input voltage can effect the reading. A digital signal would be more acurate and easier to program for but I'm sure the sensor(s) would cost more.
post #13 of (permalink) Old 11-23-2002, 10:08 AM
Mud in my Veins
 
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Analog

You do the same thing as with the fuel flow - don't use the absolute signal; use the DIFFERENCE in the signal and the reference voltage. That's how the EFI fuel, temp, and oil pressure gauges work with no cluster voltage regulator - they have 3 terminals instead of 2. [img]images/graemlins/grin.gif[/img]
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post #14 of (permalink) Old 11-23-2002, 12:08 PM
 
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Re: Analog

Ha ha Muddy 30mpg !

That's a good one ! Make that downhill with a tailwind ! The vacuum gauge is a far less accurate indicator than what our man's looking for. Hope he comes up with something, I'd be interested.

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post #15 of (permalink) Old 11-23-2002, 06:50 PM
 
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Re: Analog

What about pulling one from a vehicle that has one. My buddy has a early 90's Cougar. The gauge is in the cluster, but maybe it's an individual component and you could follow the harness to the various sensors that it may have. Just find a vehicle that has a readout that you like. There always seems to be a place to mount something when you need it. [img]images/graemlins/grin.gif[/img]
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post #16 of (permalink) Old 11-23-2002, 07:26 PM
 
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Re: Analog

see all you got to do is look at where the key is at in your ignition. OFF position uses very little fuel, while ON position uses to much so when you go down hill you turn it to off and coast.
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post #17 of (permalink) Old 11-24-2002, 03:54 PM
 
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Re: Analog

Yeah I had a friend one time who thought he'd try to save gas one night on the foothills. He decided to turn the ignition off and "save maximum gas," it got real scary once the steering wheel and brakes locked up. I thought we were going to die for sure and thats not the first time. This guy totaled 5 cars before he even got out of high school.
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