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Re: TBI vs Port Injected



> >The engine was first optimized using single, and dual plane manifolds.
>
> What single plane were you using?

Wieand 7525..

> >I
> >doubt the is a EFI manifold that outflows a Weiand 7525 (both in stock
> >form).  The times/trap speeds were a wash, it was too close to call.  The
> >TBI had all the best manners in the world.  I know carbs really well so
> >when
> >I say optimized I'm including idle circuit, transistion, acclerator pump,
> >secondary air valve, secondary needles, and hangers, air cleaners, etc.
> >They were both tweaked as far as a *normal* person would go.
> >
> > > The following is the background for this preceding questions. I am now
> > > slowly gathering the parts for a "new" 4.3 for my truck(94 m5 s10).
> >Mild
> >=
> > > 96+ 4.3 heads 2.02/1.60 ported polished and coated, GM performance
> >marine
> > > cam in a non balance shaft block, compression ration is TBD, coated
> > > Edlebrock headers and catback exhaust. Currently it uses a 16184738
VCM
> > > (VCMs control both the powertrain and the ABS plus generate the signal
> >for
> > > the speedometer and possibly other gauges).  My options are;
> > > Retain the current fuel system and improve or replace the intake
> >manifold.
> >
> >Can you get a second one?.
> >What I did was gather several manifolds, and then step by step ground on
> >one, and alternated back and forth progressively getting wilder, then
when
> >I
> >went too far, backed up to the last manifold design, and then knew it was
> >nailed.
>
> This is a very interesting concept, which I will probably try.  My only
> question is that, if I do this with a stock 4.3 TBI manifold am I starting
> with a sows ear?  My guess is that I am.  This manifold is a single plane
> manifold with virtually no runners to the center cylinders and long
> convoluted runners to the front and back cylinders.  The most compelling
> reason for converting to CPI may be to get a decent staring point for
> manifold design.
>
> >
> > > Swap the ABS system to a stand alone unit and use a auto tranny
> >calibrated
> > > 16156647 on a CPI fuel system.
> > > Find a 1995 16193495 VCM and harness and use SCPI fuel system.  This
is
> >what
> > > I was planning on doing, but I am currently having difficulty finding
> >parts.
> > >   This VCM was calibrated for a M5 and utilized the earlier CPI
> >injection
> > > system.
> > > Use the 16184738 VCM to control a Sy/Ty fuel system.  Probably the
least
> > > practical solution.
> >
> >"Practical" whatz that?
> >Grumpy
> > >
> >
> >-
>
>---------------------------------------------------------------------------
-
> --------------------------
> >
> >Date: Tue, 21 Mar 2000 07:57:10 EST
> >From: Chipsbyal@aol.com
> >Subject: Re: TBI vs Port Injected
> >
> >Another option is to use the Chevy 1992 CPI ECM. It won't do your ABS,
but
> >it
> >isn't looking for a 4L60-E trans either. This ECM only controlled the TCC
> >on
> >auto applications. There probably also had manual units. Keep the factory
> >VCM
> >for the ABS.
>
> I think this ECM is the 16156647.  Howell and TPIS specialties both
offered
> to provide me a wirning harness to do this. I haven't done it so far,
> because I have not been able to find a manual trans bin yet and I don't
want
> to have two ECUs for sake of passing a visual underhood inspection during
an
> emissions test.

I don't count on anybody, other then myself as far as most vendors go, for
chips, and harnesses.  Slow and expensive usually are terms related to them.
For what it takes to get things right it's cheaper to has them out by
yourself, has been a common lesson around here.
Grumpy
>
> Rich V.
>
>
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