DIY EFI on 400ci smallblock?

[Len Sabatine]

     Most likely , you're going to need to do the timing tables from 
scratch , especially
     in the light of 3.75 stroke and rod ratio differences in a 400 SBC 
variant. F car
     code is more user friendly than Y car , which communicates thru the 
CCM. IMHO.
     Simpler is better.
     Len

>I'm going to convert to EFI a similar engine: 10:1, 64 cc  AL heads, 404 ci,
>home made PFI. I had been looking at the AUJP as a base but considering that
>a Vette engine had AL heads and such, I'm now thinking the ANHT. Mainly for
>the timing tables. Oh yeah, and for the limp mode as I need a calmap anyhow.
>
>Hector
>http://soflaspeed.freeservers.com
>
>
>----- Original Message -----
>From: "Len Sabatine" <sabatine at epix.net>
>To: <gmecm at diy-efi.org>
>Sent: Monday, June 18, 2001 11:20 PM
>Subject: Re: DIY EFI on 400ci smallblock?
>
>
> >      Starting with *8 Injectors [ Port ]  , an 8262 ECM , and AUJP as a
>base,
> >      will produce much more satisfying results IMHO.
> >
> >    Len
> >
> >
> > >List,
> > >
> > >I have been trying to grasp DIY EFI by reverse engineering the code
> > >my P4 ECM out of an 88 4cyl fiero, and so far it has been quite
> > >frustrating/unbeneficial.  I understand the assembly code just fine,
> > >but not the ability to truely reverse engineer it and understand what
> > >it's actually doing - it's difficult to recognize the purpose of most of
> > >the subroutines and code.  I've kind of given up on this project for
> > >now.
> > >
> > >That doesn't mean i'm out of projects, yet.  :)  I am in a buildup
> > >process of a 400ci smallblock chevy bound for a 71 camaro, and
> > >i'm wondering about the prospects of converting it to a '747 TBI
> > >setup.  I'm thinking a project like this should be a LOT easier, given
> > >the large amount of knowledge and work already gone into the '747
> > >ecm, as opposed to some 4cyl ECM nobody cares about!  :)
> > >
> > >Question is, how much motor can the 747 ECM be made to deal
> > >with?  Here's what I've got, if anyone with some knowledge of what
> > >the 747 can and cannot do (or good/bad uses of it) could let me
> > >know if i'm barking up the right or wrong tree, would be greatly
> > >appreciated!!
> > >
> > >10:1 400ci smallblock chevy w/ 5.7" rods
> > >
> > >GM's 'fast burn' alum heads (the 210cc intake runner heads) in as-
> > >cast configuration with stock valves (2.00/1.55) with valvesprings
> > >appropriate for my cam choice
> > >
> > >exhaust will be headers with 1 3/4" primaries, full length tubes, to a
> > >2.5" dual exhaust with full tailpipes and crossover pipe
> > >
> > >performer RPM air gap for the vortec head bolt pattern
> > >
> > >cam is mech. roller, 232/240 @ 0.050", 0.505"/0.523" net lift, 112
> > >degrees lobe sep angle
> > >
> > >and all the necessary high quality fasteners, machine work,
> > >attention to detail and clearances, etc. to make it a reliable
> > >street/strip motor...  oh yeah, the car is a manual tranny car, 4spd
> > >for now, oneday to be a 5spd or 6spd but definately always a
> > >manual.
> > >
> > >Basically, it's a ZZ430 crate motor with 50 more cubic inches, a bit
> > >better intake, and a bit bigger cam.  If the ZZ430 was capable of
> > >430HP   out of 350ci, I reasonably anticipate an honest 450HP if not
> > >a bit more out of this 400.
> > >
> > >So, anyhow.  Is this a good candidate for a '747 TBI setup?  Can a
> > >'747 run a 4bbl TBI?  Can the '747 deal with a moderate cam that
> > >may not idle like a swiss timepiece?
> > >
> > >Any comments greatly appreciated!!!!
> > >
> > >nick
> >
>
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