"The ECM has power transistors (also called injector drivers) in it to
control the switching of the injectors ON and OFF. These injector
drivers can only handle a certain amount of power or they will fail.
This power is related to the injector impedance. A high impedance
injector will result in lower power passing through the injector
drivers. As injectors get larger, their impedance drops and the power
increases. Make sure the ECM can handle the impedance of the injectors
you install or you could fail the ECM. "
The injectors on our trucks are "High Impedance" - range = 12-16ohm.
("Low Impedance" are from .9ohm-4ohm).
When you change the resistance, you're also changing voltage. (Ohm's
law)
- Bernd
-----Original Message-----
From: owner-dakota-truck@bent.twistedbits.net
[mailto:owner-dakota-truck@bent.twistedbits.net] On Behalf Of Tony
Cellana
Sent: Wednesday, August 20, 2003 7:47 PM
To: dakota-truck@dakota-truck.net
Subject: Re: DML: RE: RE: injectors
And the difference in impedence affects them how?
TonyC
-----Original Message-----
From: Bernd D. Ratsch <bernd@texas.net>
To: dakota-truck@dakota-truck.net <dakota-truck@dakota-truck.net>
Date: Wednesday, August 20, 2003 8:44 PM
Subject: RE: DML: RE: RE: injectors
>
>Not mistaken:
>
>Impedance
>Factory Injectors: 12 +/-1.2ohms (Factory Spec - '97-'04)
>FMS "High Flow": 14.3-14.5ohms
>Design-III: 15.2-15.3
>
>While you can run different impedance injectors, going to far from
>factory will cause issues. We tested the Design-III's (Orange) on my
>'97, a '98 5.2L, and on a '99 R/T. All of them showed the same problem
>- worked with Bruce Holt on that as well as he didn't know (at that
>time) if they would work properly or not. (This was over 1 year ago.)
>
>- Bernd
>
>-----Original Message-----
>From: owner-dakota-truck@bent.twistedbits.net
>[mailto:owner-dakota-truck@bent.twistedbits.net] On Behalf Of Bob
>Mankin
>Sent: Wednesday, August 20, 2003 10:15 AM
>To: dakota-truck@dakota-truck.net
>Subject: RE: DML: RE: RE: injectors
>
>
>
>I think you're mistaken. If anything I would expect the Design III to
>perform better. Better atomization and resulting mileage. Impedance is
>close enough. If you want to argue that it's not exact match then your
>suggestion of Accel or FMS won't fly since they are not an exact
>impedance match either.
>
>Bob
>
>
>
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