[Gmecm] TBI conversion

[Frank McCracken]

Use a '7747 based TBI system. Chev Pickup and Van, late '80s early '90s. If
this is your conversion, get everything off the same doner vehicle. The Van
has the most stand alone wiring harness.
The only thing you really need to buy other than that is a VSS, [vehicle
speed sensor] that fits inline in your speedo cable. If you want to hot rod
it you'll want a Holley Throttle Body Injector [502-6?] and not use the
Rodchester unit that comes with the oem system.
There is much information about modifying your harness in the 'net. In
retrospect it is easy enough, but everything is once you know how.
Then you will need to get a prom [chip] burnt for your set up. You may even
want to get into data logging and burn your own chips fine tuning your
system.
Frank.






----- Original Message ----- 
From: "Jared Ryan" <jryan at caminofx.org>
To: <gmecm at diy-efi.org>
Sent: Thursday, November 30, 2006 10:12 AM
Subject: RE: [Gmecm] TBI conversion


> A Chevy V-8 has two coolant sensors.  There is one on the intake manifold,
> in or near the thermostat housing.  That is for the ECM.  There is another
> one in the driver-side cylinder head.  That is for the gauge in the
> dashboard.  They are totally separate.
>
> On Thu, 30 Nov 2006, Steve Ravet wrote:
>
> >
> >
> >> -----Original Message-----
> >> From: gmecm-bounces at diy-efi.org
> >> [mailto:gmecm-bounces at diy-efi.org] On Behalf Of Rick McLeod
> >> Sent: Thursday, November 30, 2006 10:59 AM
> >> To: gmecm at diy-efi.org
> >> Subject: Re: [Gmecm] TBI conversion
> >
> > www.jagsthatrun.com has a lot of EFI conversion parts like VSS, also
> > various mechanical bits, and plumbing elbows and straights for MAF
> > sensors.
> >
> >>
> >>
> >> Currently uses a 1226865, target using a 1227747/1228747 ECM
> >> (very common unit) Painless Harness 60101 (they engineered
> >> wiring based on a 90 Chevy P/U for the 1227747 as well as
> >> other similar ECMs) Holley TBI adapter 17-41 or (Painless
> >> 60118) (solves the bolt pattern match issue) Painless VSS
> >> Adapter 60115 (gets 2PPM from mechanical speedo cable), car
> >> may have an acceptable feed already since CCC may require one
> >> ThrottleBody from same size engine or modify cal on PROM to
> >> change inj size PROM from same size engine (I can modify to suit)
> >> Sensors/inputs: Knock, TPS, Temp, MAP, Spark, Speed
> >>    I would intend to make a plate to mount fuses, relays,
> >> MAP, etc onto to make installation clean
> >>    * Knock sensor exists
> >>    * TPS should be part of the TBI
> >>    * Coolant sensor (this is still an outstanding question,
> >> will the existing one suffice - I think so, if not acquire
> >> correct one)
> >
> > The computer and dash cannot share a sensor, so you'll probably need
> > two.
> >
> >>    * MAP sensor (this is still an outstanding question, will
> >> probabally have to acquire correct one) My sources show a
> >> valid 90 TBI 305 P/U part # as  OEM to be 16137939 but the
> >> parts houses show it to be 16137039, so am a little puzzled here
> >
> > MAFs for TBI and TPI normally aspirated are all the same, although they
> > come in different packages.  Any one of them would work for you.
> >
> > Get the factory service manual that corresponds to the donor ECM and its
> > calibration.
> >
> > --steve
> >
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