idea..

[Clare Snyder]

>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>
>

Nor will a simple duty cycle meter.
You must measure injector open time over a given distance, not time, to
accomplish this, as I have said before.

>-----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
>>
>>
>
>Attachment Converted: D:\TEMP\REidea1.
>
Delete the R from my address(last name) to reply - gotta try to beat the
spammers!!!
clsnyde at ibm.net