Crossfire/747

[Kevin Reynolds]

Did you use the stock 350 prom at all? If so how did it run, and what
improvements were you able to get from rewriting the prom to fit your
application?
I'm just wondering how well the stock 747 350 chip works with the crossfire
and what short comings performance wise there are in the code to meet fed
regulations.
Also, did you say you are running the stock regulator with the 350 truck
injectors? I would love to not have to go external and keep the cleaner
look, but have heard that you couldn't get a smooth idle with the seriesd
setup.

----- Original Message -----
From: "Shannen Durphey" <shannen at grolen.com>
To: <gmecm at efi332.eng.ohio-state.edu>
Sent: Thursday, December 09, 1999 9:06 PM
Subject: Re: Crossfire/747


> Kevin Reynolds wrote:
> >
> > Those of you running crossfire injection; What have you done to the
actual mechanics of the system? Larger TBIs? Spacers? Matched injectors?What
size injectors? External regulator? Extrude Honing? What actual benefits
have you seen from them?
> Swapped carby to crossfire, big improvement.  Swapped to 350 pickup
> injectors, more improvements, especially idle.  Swapped crossfire ecm
> to 7747, idles like any TBI vehicle should.  No more annoying cold
> skip.  The regulator is a factory unit with an adjustment screw that
> was never welded, and I'm at 12 psi.  I'm using it on a 302 with a
> mild cam and headers, 3.90 gears, in a 57 Chevy pickup.
>
> >
> > Checked with my dealer today. Calpac 8$ (shows same part # for all V8
trucks in 747 years)
> 454 is a different part no.
> Shannen
>  and around 50$ for a prom depending on application(with any luck I
> can find the right boneyard ECM and not have to buy either).
>  Several yards have 747s available, so in the next few weeks I should
> be on my way to getting this thing running right.
> >
> > Now, any recommendations on prom burners/erasers etc?
> >
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