saturated vs. peak and hold injectors

[elcamino73]

>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>
To: <diy_efi at diy-efi.org>
Sent: Wednesday, September 19, 2001 6:36 PM
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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