2 GM TBI units, one ECM

[Don.F.Broadus at ucm.com]

Speaking of the 749 are you out there Ron Gregory   ?
I found a 749 ECM for you.           Don


	-----Original Message-----
	From:	Bruce Plecan [SMTP:nacelp at bright.net]
	Sent:	Monday, December 07, 1998 3:57 PM
	To:	diy_efi at efi332.eng.ohio-state.edu
	Subject:	Re: 2 GM TBI units, one ECM


	-----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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