Re: curious about sfi

["Swayze" <kswayze@bellsouth.net>]

I was thinking (also) of converting the pulse width to counts feeding the
count value to a latched circuit for each injector and firing the
injector(synched) using the latched counts. being able to fire the injector
driver (in the ecm) 8 times per engine cycle would have just made it easier
(it would  only have to count and sequence not store the value). (whats a
wile e. coyote smiley look like)
thanks
byE
Mike
Swayze
mswayze@truswood.com
kswayze@bellsouth.net
----- Original Message -----
From: "Ludis Langens" <ludis@cruzers.com>
To: <gmecm@DIY-EFI.ORG>
Sent: Friday, March 03, 2000 11:14 AM
Subject: Re: curious about sfi


> Swayze wrote:
> >
> > I understand that above 3000rpm I wouldn't be able to tell the
> > difference between sfi and batch. If however the circuitry is
> > relatively inexpensive..why not?
>
> The circuitry is _not_ relatively inexpensive.  You can't just route the
> ECM's injector signal to the desired cylinder like with DIS.  The
> injectors need to be able to stay on for far longer than one cylinder's
> worth of crank time.  At any given time, the number of injectors firing
> might be zero, one, two, three, on up to the total number of injectors.
> You need a timer chip in the ECM that works with two times the number of
> cylinders worth of on/off times.
>
> --
> Ludis Langens                               ludis (at) cruzers (dot) com
> Mac, Fiero, & engine controller goodies:  http://www.cruzers.com/~ludis/
>
>
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