[Diy_efi] Re: diy_efi Digest, Vol 6, Issue 9

[Bill Shaw]

Hey Lou,

The 749 should be able to handle the 4 injectors just fine,  in fact it runs
6 in the SyTy.  We only have trouble when we get to 8.

Are they low impedance or high?  I'm guessing low since you're talking about
p&h mode.  The injector jumpers wire in the current sense circuit that
enable p&h mode.  The Sunbird uses them,  the SyTy doesn't.  Oh yes,  the
Porsche uses them also  :-)

Bill
'84 928s 5 sp (FrankenPorsche)

> From: lou trapane <lout at epix.net>
> 
> hello all
> 
> I just got my truck out of the garage and need some advice.  I am using
> a 749 sunbird ecm to fire 2 injectors in my GM TBI.
> 
> first...the GM tbi uses the P&H style injectors corrcet?  I am only
> driving two(of course)injectors-- one from each injector output.  Am I
> overheating or destroying anything?
> 
> second...i am going to use two tbi's to feed my roots blower so i need
> to drive 4 total--can i just wire 2 injectors to each of the ecm's
> drivers?  I have the parts to build an injector driver board sitting on
> my bench  will i need this?  I read a few places where the 749 can drive
> 4 P&H injectors stock..is this for real?
> 
> third...what do the injector jumpers on the 749 do for me?  it shows in
> the 749 pinout to have them connected together.   I currently have them
> connected togther(the proper wires together of course) and the whole
> thing seems to run just fine.
> 
> thank you for your time
> lou trapane

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