idea..

[Gary Derian]

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Even though vacuum is proportional to fuel flow in a given gear, it =
cannot be used to optimize driving style to maximize fuel economy or =
answer questions such as which gear is most economical to climb a hill =
or is it better to accelerate quickly and get in to high gear sooner or =
accelerate slowly and stay in the low gears longer.

Gary Derian  <gderian at cybergate.net>

-----Original Message-----
From:	Clare Snyder [SMTP:clsnyde at ibm.net]
Sent:	Tuesday, October 07, 1997 9:10 PM
To:	diy_efi at coulomb.eng.ohio-state.edu
Subject:	Re: idea..

>This mechanical engineer had an idea related to this thread and I
>haven't a clue a clue how to implement it.  Would it be easy to use one
>or more of the standard IC's to make a visual instantaneous fuel usage
>meter?  If the fuel pressure to the injectors is constant, then the
>variable of fuel delivery is injector pulse.  If you knew what the
>longest potential injector pulse length is, then could you make a
>display of ten LED's and have the LED's light up as the pulse length
>goes up?  I realize the pulse length is rather small in relation to the
>respomse of the LED's and your eyeball, but it seems like a resonable
>project.  I'm more interested in if it could be done easily rather than
>begging someone to do it.
>
Yes, it can be done. The pulse width (duty cycle) needs to be changed to =
a
voltage, which can read out on a meter, bar-graph, or digital readout. =
It
will not be MPG, but instantaneous fuel flow. By keeping it as low as
possible, you get your best mileage. A vacuum guage does the same thing =
at
less cost and with less complexity.


>Joe Boucher
>'70 RS/SS Camaro   '81 TBI Suburban
>
>

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