saturated vs. peak and hold injectors

[Bruce]

Those operating times, are different from what folks have realized around
here.  While size will have some effect on it, you generally can go down to
1 msec for operating times on a Saturated injector, and less then that for a
Peak and Hold.
Bruce



From: "elcamino73" <elcamino73 at mindspring.com>
Subject: Re: saturated vs. peak and hold injectors
> From what I have read in accel's eimac training manual and two other books
> on fuel injection the peak and hold rise time is slightly better, however
> the fall time is greatly improved because there isn't as much current to
> dissipate into the zener diode when the driver turns off. I am running
into
> a similar situation on my car. I am building a blown 377 sb Chevy which
> requires a large dynamic range for the injectors. This ecm is a
simultaneous
> double fire which cuts the on time in half compared to single fire set
ups.
> That ends up being less than 1.5 ms for idle in my car. Peak and hold
> drivers can open and close in about this time but it is not very
repeatable.
> They need to be on in the range of 2-2.1/2 ms to get a clean idle.
Saturated
> drivers need about 1.3/4-2 ms to cycle. Which means repeatable time would
> probably be 2-1/2 -3-1/2 ms.  If your idle on time is in that range I
would
> expect things to be okay. I'm trying to bridge two ecms to get eight peak
> and hold drivers allowing me to use 8 peak/hold injectors instead of eight
> saturated (two per driver).
>                                             Let me know how it fares for
ya.
> ----- Original Message -----
> From: "Rausch, Bernd" <br at rnt.de>
> Subject: saturated vs. peak and hold injectors
> > I have to replace peak and hold injectors with saturated injectors of
> > the same size (510ml/min, Bosch). What can I expect for topen-tclose of
> > the different injector designs ?
> >
> > Any help would be greatly appreciated.
> > Best regards,
> > Bernd


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