Re: Can a GM ECM be tuned

["Dave & Irina Eicher" <sailors@mwci.net>]

Hi Andrew, I'm very interested in what you learn as you tinker with the LS1
PCM. I have a 1998 LS1 from a Z28 Camaro that I plan to put in my 1964
Impala SS. I've been wondering how I might program it if I add a blower or
turbo. I thought those PCMs had EEPROM rather than Flash, No? Or maybe Flash
for programs and EEPROM for the fuel table and spark advance? Maybe I have
bad information?

thanks, dave


----- Original Message -----
From: Andrew K. Mattei <amattei@mindspring.com>
To: <gmecm@diy-efi.org>
Sent: Sunday, July 30, 2000 4:06 PM
Subject: Re: Can a GM ECM be tuned


> >So what is necessary for reflashing? Can it be done with common
equipment?
>
>
> >>They can be reflashed... Not sure the address, but there are several
> people
> >>that have cracked into the PCM for the 96 LT1.
> >>I also believe there is a rom dump from that PCM on the ftp site...
> >>ftp://diy-efi.org/incoming
>
>
> Well, I've got an LS1 PCM on my desk right now that I'm going to be
removing
> the flash chip from and reading with an EMP-20 (the chip is an Intel
> AB28F400BX - 4 Mbit flash chip). Biggest problem is that it uses a chip
> package that doesn't lend itself to being inserted in a conventional
> reader/programmer very well. I'm going to make a little adapter for it if
I
> can, and if that doesn't work, I'll carefully solder wires on each of the
44
> legs. ;)
>
> The 94/95 LT1 flash chip is *easy* to work with, since it's a standard
> 32-pin PLCC package. Took about an hour for me to build a PLCC to DIP
> adapter so I could read that one with my burner.
>
> As long as your burner supports the chip, you can read and flash it all
you
> want. My Needhams EMP-10 supports the Intel AN28F512 that's found on the
> 94/95 LT1 PCM, but the replacement chip from Catalyst (CAT28F512NA)
doesn't
> work in the EMP-10 (but it does work in the EMP-20 we have at work).
>
> Gotta watch out for flopped address lines, though. GM does that. ;)
>
> -Andrew
>
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