ECM 1227748, creating a new ECU file?

[Nick McAlpin]

I would be greatful for anything you have!

i know it's not a popular ECM or anything but hey it's what's in my 
car...

anything you have would be great!

thanks,
nick

On 20 Feb 2001, at 21:49, TK wrote:

From:           	"TK" <terryk at foothill.net>
To:             	<gmecm at diy-efi.org>
Subject:        	Re: ECM 1227748, creating a new ECU file?
Date sent:      	Tue, 20 Feb 2001 21:49:19 -0800
Organization:   	Send reply to:  	gmecm at diy-efi.org

> I've done some work on the 748 code for the 4 banger Fiero/Grand Am. Why, I
> don't know ........
> 
> I can upload it to incoming if anyone cares.
> 
> TK
> 
> 
> ----- Original Message -----
> From: steve ravet <sravet at arm.com>
> To: <gmecm at diy-efi.org>
> Sent: Tuesday, February 20, 2001 12:05 PM
> Subject: Re: ECM 1227748, creating a new ECU file?
> 
> 
> > Nick, I have the same ECM and am hoping to put it on a boat some day.  I
> > have looked through a few bin files and there are 7 or 8 or so 3d tables
> > that jump right out at you.  That's the extent of my work, though, I
> > don't know what the tables do.  Tunercat doesn't seem to support 1227748
> > although he might be talked into it.  I doubt Terry K has an editor
> > either, just because it's not that common an ECM.  but who knows, as
> > him.  I'd be interested in swapping info on this ECM if you come up with
> > anything.
> >
> > Nick McAlpin wrote:
> > >
> > > What does it take to make a new ECU file from scratch?
> > >
> > > I'm the one with an 88 coupe who got some help from the list over
> > > the past few days (thanks all!) and i am interested in working with
> > > the EPROM code/tables a little bit but being a less common ECM,
> > > the ECU doesn't seem to exist.
> > >
> > > So, my question, is building an ECU really not much more than
> > > looking through the bits of the .BIN, identifying tables purely by
> > > pattern and then playing with them to find out what they do?  what
> > > about single byte memory spots - do you guys just change the
> > > value one byte at a time to find out what it does?
> >
> > Basically.  Once you find the tables, you can start changing values
> > (like zero out an entire line) and see what the effect is on timing or
> > fuel.  You don't want to do that on a car, you want to do it on an ECM
> > testbench.  There is some information about building an ECM testbench on
> > the WWW page http://diy-efi.org/gmecm/projects/ecm_testbench/
> >
> > There is some info in the archives, mostly from Ludis, about this ECM.
> > Search around in there also.
> >
> > >
> > > is there any standardization in the table formats of ECM's?  For ex.
> > > if I find a table of size X columns and Y rows that it is probably
> > > table Z?  or is every ECM/bin different.
> >
> > As I understand it, bins that share the same mask code have tables in
> > the same places, and the same sizes, as each other.
> >
> > >
> > > It seems like if I have to start from total scratch, I could end up
> > > burning 1000's of EPROMS and doing a lot of guesswork (and hope
> > > not to break anything in the meantime?)
> >
> > Yes to the 1000's (unless you get an emulator), no to the breaking stuff
> > if you use an ecm testbench.
> >
> > --steve
> >
> > --
> > Steve Ravet
> > steve.ravet at arm.com
> > ARM,Inc.
> > www.arm.com
> > --------------------------------------------------------------------------
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> >
> 
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