555 EFI

[Mike]

>rauscher at icst.com wrote:
>
>>Ya know' thinking about this, it just may work. Trigger the
>>555 from the distributor, divided by whatever to fire the
>>injectors the number of times per rev.
>>
>>Drive pin 5 (labeled 'control voltage' in the NS data book), from
>>a summing junction that has as input:
>>
>>    change in TPS (open more, short duration)
>>    RPM
>>    MAP
>>    CTS
>>
>>The only real downside, would be the VE. You would need to build
>>a non-linear function into the RPM/MAP areas.
>
>That's the trick.  I think that the injection duration is a rather 
>nonlinear function of all these variables.  Building an electronics pack 
>to properly "stir" them together might be very challenging.  
>
>Personally I'd go PIC/AVR with a multichannel A to D converter! :)
>

Was thinking the same thing. PIC16C672...8-pin DIP (or SO SMT pack),
4-channel A/D converter, interrupt on delta if memory serves. Pretty capable
part in a tiny package.


--
 Mike