Sequential vs Batch Fire

[Bruce Plecan]

> I didn't fully explain these details b/c I didn't feel they were
necessary.
> High impedance injectors (saturation) have an opening time of ~ 1.2-2 ms.

Odd, I've had them running at .9msec (OEM GMs), less then that, they go
erratic for an instant, then stop.

>I
> will be using Low impedance injectors (peak and hold) which have an
opening
> time of ~.3-1.2 ms (large variance due to a lot of different information I
> have gotten from manufacturers).

Can't see that as being a univerally true figure.

> As far as closing time is concerned, I never got a figure for that.
> Assuming .5ms, does the ECU stop the current to them .5ms early or is this
> just added on to the existing pulsewidth values of most ECUs, unbeknownst
to
> most people?

Hard to tell what most folks know <g>..  I haven't seen anything in GM stuff
where is says add this much time for closing delay.
They do use a operating voltage correction, thou
Bruce
>
> James Ballenger
>
> -----Original Message-----
> From: owner-diy_efi at diy-efi.org [mailto:owner-diy_efi at diy-efi.org]On
> Behalf Of Axel Rietschin
> Sent: Saturday, October 28, 2000 7:31 PM
> To: diy_efi at diy-efi.org
> Subject: Re: Sequential vs Batch Fire
>
>
> ----- Original Message -----
> From: "James Ballenger" <vtjballeng at yifan.net>
>
> > Assuming 1ms opening time -> Duty Cycle is (10ms-1ms)/10ms = 90%
> > Injectors = 13.75lb/hr/.9 = 15.3 lb/hr injectors
>
> One small detail: injectors don't close instantly. You have an avg of 33%
of
> flow during the opening/closing time (which is more like 1.5ms by the
way).
> This reaction time adds something constant (close to 0.5ms, for all
> practical purposes) to the pulse.
>
>
>
>
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