GM ECM injector driver capacity

[Matt Smith]

I kinda jump in the middle here with out all of the information:
If the injectors in parallel, the inductance will go down.  This should also
provide less back emf...right?

If they are run in series, then the inductance will go up.

I don't know if the drivers can source enough current to all of the injectors.
If not, I would probably break the set up and run say 8 groups (of 2 inseries)
all in parallel, or 4 groups of 4 in series in parallel with each other.

Just my $0.02,
-Matt

Sandy wrote:

> I don't know about the nubers, but it relates to the heat dissipation of
> the flyback diode. Look at the LM1949 datasheet, it has some rough
> calculations for power dissipation of that. Like I said, might be fine, but
> you now have 9 times the current going back into that diode, and although
> the numbers seem low, I would imagine that it will more 9 times more heat
> as you are dumping much more back emf them one injector. The real question
> is, since they were peak and hold, and the impedance of the injector is
> much lower, thus drawing lots more current the EMF from that type of
> injector will be much higher, how much, I doubt 9 times, but might just
> work fine. The bigger problem _again_ is that if the injector is a peak and
> hold type, and it goes into hold mode will you be driving 10 injectors with
> 1/4 of their required current. 10 saturated injectors = 10 amps in parallel.
>
> Anyone that knows electronics jump in at any time ;-)
>
> Sandy