555 EFI

[Steven Ciciora]

> Hey, If you can show me plans for EFI reduced to a 
> 555, I'll be the first to build it and withdraw the joke

> Bruce Roe, With 79 Cadillac injection, ANALOG
> ECU, and no OX sensor or closed loops at all

Didn't some guy from Superchips, Hyperchips, or something like that post
how he used a vortex shedding flowmeter (from a junkyard) and a 555 for a
fuel injection setup?  A vortex shedding flowmeter puts out one pulse for
every x grams of air, so for every pulse, it fires a 555 oneshot, long
enough to put out (1/14.7) grams of gas through the injectors.  The flow
meter didn't have a perfect linear output, but you can 'tune' for the
range of interest.  And it worked.  Didn't that post spawn off a seperate
group on building a 555 injection setup?

<snip>
<a different post>
> 
> PS. Thanks for your thoughts Bruce, but we want to keep it simple and try 
and use just a single 555 for the main circuit. We would be happy for
your 
design to use the low power CMOS 555 variant - we are always looking to reduce 
our fossil fuel reliance.
> 

Umm, your kidding about wanting to use CMOS parts, right?  I bet the turn
signal uses 100x the power of a non-cmos 555.



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