Makes a little more sense now.
Next question: what will the lower voltage (due to higher impedance) do to
the injector in terms of cycles per sec, reaction time, etc?
Or is it a matter of the additional voltage required to drive them causes
additional heat in the PCM circuitry, and therefore a higher
percentage/shorter period to failure in the PCM?
Tony
-----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 11:35 PM
Subject: RE: DML: RE: RE: injectors
>
>
>"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
>>
>>
>>
>
>
>
>
This archive was generated by hypermail 2b29 : Fri Feb 06 2004 - 11:46:48 EST