Re: Mods to '85 GM TPI ECM

[romans@starstream.net (Romans, Mark)]

After spending the last 3 years messing with a my car. I learned some stuff.

 I would suggest that before you spend a lot of time with the stock ecm,
that you just jump to a 730 ecm, especially since you have a larger
displacement engine.  My 355 max's the code in the software at 255 grams/sec
at 4700 rpm's.  Your 383 will be even earlier and after the software (Notice
I am no longer saying the MAF is max'd!) is maxed the system is simply a
Alpha N which means it adds fuel simply based on rpm, no longer taking load
into consideration.
GO 730! (I bought two at a local pick and pull for $35.00 each)  (Cavalier)
Get a good serial port prom programmer.
Get Gme Pro
Get Diacom
Read the archives and stay with this list and you will literally be able to
"SUPERTUNE" your car!
Mark


----- Original Message -----
From: "Jim and Sharon Brady" <bradyiii@shore.intercom.net>
To: <gmecm@diy-efi.org>
Sent: Thursday, June 22, 2000 8:22 PM
Subject: Re: Mods to '85 GM TPI ECM


> Craig,
>      Great, we are working on a similiar project!  What has the experience
> been like with the EPROM's?  Did you have to buy an extra EPROM in case
you
> messed up your factory one?  Have you or can you do any manipulating to
the
> ECM itself?  Is there any real disadvantage to our slower ECM?  Tons of
> questions.  Look forward to learning a ton!
>
> Jim Brady
>
> > Hi Jim! We have something in common... I've got an '85 Corvette which
uses
> > the same ECM as you. First, like others mentioned, you need to find the
> ECM
> > and broadcast code from your EPROM. The code on mine is HLH3200, which
> > seemed pretty common on '85 Corvette's. If your ECM has a big 1226870 on
> it,
> > then you've got the slower ECM like me. The other ECM that has been
talked
> > about is the 1227165 that was used on '86-89 F and Y cars (and a bunch
of
> > others I'm sure) and is much faster at spitting out ALDL data than our
> '870
> > ECM. If you do have the '870 ECM, then the chip that you'll need to
> program
> > is a 2732A, cost a few bucks each. I use the Needham's PB-10 burner,
which
> > goes in an ISA slot and cost about $125. You'll also need an EPROM
eraser,
> I
> > use the DataraseII, about $50. You can download Tunercat from
> > www.tunercat.com, that'll help get you started with changing things.
> Anyway,
> > get back with the broadcast code, and you'll be able to get alot more
> help.
> > I'm really new at this, but I've been working alot with the '870 ECM, so
I
> > may be able to help you once we know what you've got.
> >
> > Craig M.
> >
> > > Hi, my name is Jim Brady and I just joined the list a few moments ago.
> My
> > > current project is my '87 Monte SS.  My Monte is equipped with the GM
> > > TPI(Tuned Port Injection) system consists of an '85 computer(I
> > > assume I have
> > > an '85 computer because it had a Bosch MAF burn-off box attached
> > > to it) with
> > > '87 hardware.  My original motor was a 305 and the system worked
> perfect.
> > > My new setup is a 383(stroked 350) with a T56 manual trans.  The only
> > > changes I have made to the system since I upgraded from the 305 to the
> 383
> > > is 24lb/hr injectors and a fuel pressure regulator.  Everything
> > > works great
> > > except full throttle.  I understand full throttle switches the ECM to
> open
> > > loop mode leaving the EPROM to feed the system pre-determined
> > > values.  Aside
> > > from improving my full throttle condition I would like to monitor the
> > > parameters of the running motor.  What do I need to approach this
> project?
> > > I assume an EPROM burner, cable for the aldl connector and software.
> What
> > > can I manipulate with the software?  How about the EPROM.  I am
> > > new to this
> > > and would appreciate any help you can give on this matter.  Thanks.
> > >
> > > Jim Brady
> > > '87 Monte SS 383 TPI 6 speed
> > >
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