2 GM TBI units, one ECM

[Bruce Plecan]

-----Original Message-----
From: andy quaas <realsquash at yahoo.com>
To: diy_efi at efi332.eng.ohio-state.edu <diy_efi at efi332.eng.ohio-state.edu>
Date: Monday, December 07, 1998 4:45 PM
Subject: Re: 2 GM TBI units, one ECM


>Excuse the ingnorance, but what is a cross-fire system, exactly? 

Two single TBI units, with a connecting linkage.  Sorta like a Smokey
Ram, or Cross Ram.  

 Did
>this come with a 747?

Nope

  How are your injectors wired? 

One per injector driver.

 Parallel?  My
>only big question is whether a 747 will be ok with 4 injectors!

Use a 749.
>
>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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