Basic GM TBI injection questions.

[Joe Boucher]

When you say you are looking for data located in a PROM, do you mean a GM PROM
or the Holley PROM?  There is a utility available from the ftp site
(ftp://efi332.eng.ohio-state.edu/incoming) called spit.zip that has three
utility files to make three specific GM ecms cough up their inner secrets.

On the Syclone/Typhoon home page (www.syty.org) are a couple of utilities to
mess with those proms.  The T-Type folks probably have a similar setup.  But I
don't think those ecu's are using the 68hc11, are they?

mfwic wrote:

> I just joined this group also. And I have similar questions about the fuel
> maps used.
>
> We want to use an existing fuel map as a starting point for a digital
> controller that we are
> building as part of a graduate student project. We have a target vehicle
> and some preliminary
> electronics.
>
> The vehicle has a 350SBC with a throttle body from the Chevy dealer and a
> Holley
> Pro-Jection brain from the flea market. It has a turbo from a Buick
> Grand National along with a new cam for the turbo. We want to replace the
> Holley brain
> with a digital controller of our design.
>
> We have watched most of the signals and we are starting to collect
> real-time data via
> a 68HC11 evaluation board(EVB) and a laptop running Labview.
> The EVB will probably not remain as part of the final design but is easy to
> use at this stage.
> We also have a Motorola DSP 56K EVB and a PIC BASIC Stamp that will be part
> of the initial development.
>
> We want to modify the fuel map with a neural network.(this is the actual
> graduate student project). Any
> suggestions for the neural network would be appreciated but what we need to
> know at this point concerns
> the PROM's.
>
> Where can we get info on what data is located where in a PROM ?
> How many inputs/outputs in the look-up table(s)/map(s)?
> We have the capability to read/program any PROM up to 28-pins.
> We have been reading what we can find on GM controllers but haven't found
> very
> much specific information.
>
> Any help or direction would be greatly appreciated.
>
> Rich Klinger
> Cone-shaped hat with oak-leaf clusters
>
> ----------
> > From: Carl Summers <InTech at writeme.com>
> > To: diy_efi at efi332.eng.ohio-state.edu
> > Subject: Re: Basic GM TBI injection questions.
> > Date: Monday, March 09, 1998 6:30 PM
> >
> > Mike Dillon wrote:
> > >
> > > I just subscribed to the group and looking for some referances on
> > > GM TBI injection systems. The particular one I am working with
> > > is from a 89 caprice with a 350 engine. The plan is to give it a new
> > > home under the hood of an 83 Jeep Wagoneer (The big one) with a 360
> > > AMC engine. I can work out all the mechanical problems without to
> > > much difficulty, but I would like to be able to retune the ecm's
> > > PROM based on learning mode base table offsets.
> > >  I am hoping that someone on this group can fill answer some
> > > basic questions about the ecm and proms.
> > > 1) What processor does GM use in there ecm ? I looked at my ecm and
> > >    all the chips were labled with Delco numbers (No help to me)
> > > 2) Does the PROM carry both the control software as well as the
> > >    calibration data ?
> > > 3) I see referances to 747, 730 ... is one better than the other(s) ?
> > >    does one have more functionality than the other(s) ?
> > > 4) Has someone other than a few companys broke the PROM code ?
> > >
> > > Thanks Mike
> > >
> > Hi Mike,
> >     The computer you are looking at should be a 1227747 and takes a
> > 2732a chip....but if you used the one from the caprice it has air temp
> > correction the 747 has not,,,,not that it's that big a deal but air temp
> > correction is all about smog and yes the 747 has only lookup tables and
> > not very much code....but finding the fuel table shoudn't be so
> > difficult to modify......let me know if you need help.....and the code
> > isn't always in the chip................c-ya
> > -Carl Summers