[Gmecm] Injector pins

[Bill - Comcast]

The '749 had 2 applications originally,  one TBI application and one TPI 
application.  The TBI app used 2 injectors,  one per driver.  The TPI 
app used 4 injectors on one driver.  The current for the 4 injectors was 
split across 2 pins.  (from memory,  so don't shoot me if some details 
aren't exactly right! :-)

Bill

Robin Handley wrote:
> Thanks Bill.
>
> Why does the 749 have 2 pins for one bank and 1 for the other!?
>
> I only need to run 4 high impedance injectors, so plan to just use one ECM
> pin for the -ve side of all the injectors, and another ECM pin for the
> ground connection. I'm trying to be sure which pins to use on a 727 when
> running $58 code. :-)
>
> BTW: Should the ECM pin to ground connect to the battery -ve terminal or the
> engine?
>
> Robin
>
> ----- Original Message -----
> From: "Bill - Comcast" <b.shaw at comcast.net>
> To: <gmecm at diy-efi.org>
> Sent: 03 August 2006 14:03
> Subject: Re: [Gmecm] Injector pins
>
>
>   
>> 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
>>     
>
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