555 EFI

[rauscher at icst.com]

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.

If kept simple, just as a way of running a system, it might be
worth it. Maybe as a trunk 'backup system' for when the real
ECM dies too far from home?


BobR.


P.S. Bruce, for the TPS, no level shifting required. Just tie
one end of the TPS to +5v, the other end to +3.33v, Wha-la...

(get the 3.33v from a LM317 adj volt reg, or a resister divider).

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