2 GM TBI units, one ECM

[andy quaas]

Excuse the ingnorance, but what is a cross-fire system, exactly?  Did
this come with a 747?  How are your injectors wired?  Parallel?  My
only big question is whether a 747 will be ok with 4 injectors!

Andy Q

---Bruce Plecan <nacelp at bright.net> wrote:
>
> 
> -----Original Message-----
> From: andy quaas <realsquash at yahoo.com>
> To: diy efi <diy_efi at efi332.eng.ohio-state.edu>
> Date: Monday, December 07, 1998 2:10 PM
> Subject: 2 GM TBI units, one ECM
> 
> 
> >I searched the archives and I am left with some questions.  On the
> >corvette cross-fire injection, what ECM is used? 
> 
> I wouldn't think about that ecm, use a 7747.   I've been running a 
> Cross fire of the 747 for years.
> 
>  How are the IAC(s)
> >done? 
> 
> Just wire em in parrarel.
> 
>  What is the big difference between a 8747 and 7747?
> 
> 8747 uses a MAT sensor, as I recall.
> 
>   I know the
> >older big-block's came with 90 lb/hr injectors, so does the 8747 have
> >larger inj. drivers?
> 
> Nope, all the TBI's that I know of use the same style P+H..
> Bruce
>   Thanks.
> >
> >Andy 
> >
> >
> >
> >
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> 

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