saturated vs. peak and hold injectors

[elcamino73]

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.


----- Original Message -----
From: "Bruce" <nacelp at bright.net>
To: <diy_efi at diy-efi.org>
Sent: Tuesday, September 19, 2000 9:37 PM
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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