[Gmecm] '747 and multi=port

[Nick Cooper]

does anybody have an opinion on the differences in performance between a
factory tbi system and a tpi system set up with this ECM? If i'm
interpreting this correctly, it'll control very similarly to the batch fired
TPI.
Does the 7747 have a baud rate similar to the SD TPIs (7727/7730)?
I think the use of the longer TPI runners wil increase the torqe. Seems like
a much better idea for a truck anyway.

http://www.edelbrock.com/automotive/index.html, look for "Multi-point fuel
injection", then look for "Multi-Point Fuel Injection for '87-95
TBI-Equipped Chevys"

-----Original Message-----
From: gmecm-bounces at diy-efi.org [mailto:gmecm-bounces at diy-efi.org]On Behalf
Of David Haggard
Sent: Sunday, April 10, 2005 10:20 AM
To: Dave
Cc: gmecm at diy-efi.org
Subject: RE: [Gmecm] '747 and multi=port


This is great to know, as I was thinking about using bank fire multiport
injectors on my next build, a 350. I can't use Edelbrock's PROM, just modify
the one I already have. But if I could get their wiring harness for the
injectors it would save a bunch of work.

David




From: Dave [mailto:hernt at mindspring.com]
Sent: Sunday, April 10, 2005 12:32 AM
To: David Haggard
Cc: gmecm at diy-efi.org
Subject: Re: [Gmecm] '747 and multi=port


Yes. Check out their online catalog. Edelbrock provides a new PROM. I had to
toss it since the PROM did not accommodate the increased stroke (383 vs.
350) or different cam. Easy to install (I had the engine out on a stand).
Very good performance. Still tweaking, this is my first modified EFI.

David Haggard wrote:
Thanks.
Did that setup come from Edelbrock? I mean, connecting the injectors to the
'747?

David


-----Original Message-----
From: gmecm-bounces at diy-efi.org
[mailto:gmecm-bounces at diy-efi.org] On Behalf Of Dave Harvey
Sent: Friday, April 08, 2005 12:43 AM
To: gmecm at diy-efi.org
Subject: Re: [Gmecm] '747 and multi=port

David,
My 91 GMC pickup was originally TBI w/ 1227747. I installed
an Edelbrock multi-port injection sytem on top of an HT383
engine. The Edelbrock uses the '747 to bank-fire the
injectors. I'm 99% sure the injectors are wired in parallel
in 2 groups of 4. Pretty slick setup.

-- Dave

David Haggard wrote:


I seem to recall reading in past documents and messages

that a 1227747

can run multi-port injection in bank-fire mode.



Is this true? If so, should each bank of injectors be wired

in series,

or parallel? (I once had a dual 2-bbl TBI setup on a crossfire, and
those injectors had to be wired in series. They would not

fire at all

in parallel.)



David Haggard

   '88 Formula Firebird "SR-71 Black 'Bird"





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