[Gmecm] Injector pins

[Bill - Comcast]

To handle the current.  The '749 has two pins for one bank but only one 
pin for the other bank.  When I retrofitted the injector drivers in the 
'749 to handle the 8 P&H injectors in my 928 I also commandeered an 
unused pin for the 2nd injector bank to help carry the current load. 
http://p-928.home.comcast.net/749mods.html

8 injectors @ 4 amps each running near full on (6500 rpm) is a LOT of 
current!

hth,

Bill


 Robin Handley wrote:
> I've been wondering about injector connections - i.e. why there are two, for
> each bank of injectors. Can anybody explain? (The background to this is I'm
> trying to understand if it's possible for _only_ one pin to change when
> different software is used - as is suggested by the 749-730 mapping on
> thirdgen.org.)
>
> I've looked at Ludis' schematic, but my electronics knowledge is weak, so it
> doesn't really help.
>
> >From looking at $8D and $58 code, it _looks_ like memory location $3FD0 is a
> PWM output which is used to turn on (all) the injectors in both codes. Can
> anyone confirm? If this is the case, then I would expect the $58 code to use
> exactly the same injector pins as $8D does on 727 hardware.
>
> Robin
>
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