GM ECM injector driver capacity

[Ken Kelly]

Brock,

	I think the injectors may rely on the fuel flow for cooling. It would probably
not hurt to run a short test dry, but I would worry about a long test with dry
injectors. you may be able to just put the injectors in a non-flamable, low
conduction liquid to allow longer tests. If you know which device is the driver
in the ECM, it would be a good idea to monitor it's temperature rise with 8
injectors, and then with 16. If the driver can handle 16 at reasonable
temperatures, you could mount a larger heat sink or small fan on it to get
through the higher ambient temperatures found in the car.

		Ken

Jennifer and Brock Fraser wrote:
> 
> > Do you know of any online reference that gives the Injector
> >specs? I will look at it to see if I can figure out a
> >reasonable load. The one problem that may be difficult to
> >model is that releasing the injector can actually create a
> >voltage spike from the plunger returning to its seat.
> 
> Thanks for the help, Ken and Bruce.
> 
> I think the best and most error-proof course of action is to scrounge up 16
> injectors and hook'em up to Bruce's bench.  We can just pulse them dry
> (without fuel), if just for a short period of time.
> 
> I know I've got at least 12 spare stock GM injectors, so let me see if I can
> round up a full set of 16.
> 
> Bruce-  if you'd be willing to test the rig, I'd cover the cost of a
> computer if we smoked the drivers in yours.  Do you have a 730 or 165
> computer for the experiment that can be used on your bench?  I don't have
> one-  I'm still in the feasibility stage of this project, which is why I'm
> asking the question...  A batch of 16 injectors clattering are really going
> to be "whistlin' dixie" on your bench...  You might feel like tap dancing.
> 
> Is the consensus to gang the two drivers together (as is stock), and then
> run the 16 injectors in parallel from that point to ground?  I'd need to rig
> up some wiring for this experiment.
> 
> -Brock
> 
> PS-  Still no replies on my Caddy 4.1L v8 DIS for 165/730 ECM soundbite...
> I can't believe it!