727 ECU limits

[rr]

Put a larger value variable resister between pin 7 and v+. May
have to change the cap at pin 6 to get within the correct range.

BobR.

Bruce Plecan wrote:

> What's the quickest easiest way to extend the range of 555?.
> I'll need to about thriple it, so rpm goes to 12K......
> TIA
> Bruce
>
>
> > -> The software computes rpm in units of 25 rpm and stores this in a
> > -> byte. 255 * 25 = 6375.  There are other variables in other units, but
> > -> the 25 rpm one is the main variable.
> >  I get the feeling messing with that could become a nasty project.
> > -> The batch injector firing is still done in sync with the "RPM input"
> > -> (at every 2nd, 3rd, or 4th reference pulse.)
> >  Hmm... I could cut the number of reference pulses in half by modifying
> > the reluctor and the fuel would be good to 12,750, which would be great.
> > But I'd only get every other spark event.  Hmm... but maybe I could use
> > the 4-cyl code for a distributor engine, which would send four spark
> > signals per 720 degrees, except use the signals to drive two coil packs,
> > each of which fires two cylinders at a time?  I'll have to try to sketch
> > that out.  Might not work anyway.
> >  Thanks for the help, Ludis!
>
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