saturated vs. peak and hold injectors

[Bruce]

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Bruce

From: "elcamino73" <elcamino73 at mindspring.com>
Subject: Re: saturated vs. peak and hold injectors
> If you have hands on experience with times that low I will feel better
about
> what I'm doing. But what you are telling me does differ from every source
I
> have talked to. But once again I am on my first EFI system, and only at
the
> beginning stages of that.

> From: "Bruce" nacelp at bright.net
> Subject: Re: saturated vs. peak and hold injectors
> > 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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