LS1 - Flash - Reprogramming

[Dave & Irina Eicher]

Hi John,

I'm putting an LS1/six speed in my 1964 Impala SS. I would like to disable
some of those functions. My LS1 is from a 1998 Camaro Z28. Can you disable
VATS and the emissions stuff? If so, what do you charge?

thanks,

Dave Eicher
319-295-8348 work deeicher at collins.rockwell.com
319-922-2626 home sailors at mwci.net
319-431-9001 cell

----- Original Message -----
From: Speartech <speartec at iquest.net>
To: <gmecm at diy-efi.org>
Sent: Thursday, November 02, 2000 6:56 PM
Subject: : Re: LS1 - Flash - Reprogramming


> Andrew, Bob, and others:
>
> After many hours of investigation I am able to reflash the LS1 PCM's with
> an export VIN for my streetrod engines. This allows me to set the engines
> up w/o EGR, cats, A.I.R., or post-cat O2 sensors, which is what most of my
> customers prefer, but it would sure be nice to do much more with the
> calibration!!   I have access to a few of the chips; Intel flash 28fn400
> ??......I don't have one in front of me, that is probably not the exact
> number.  What programmer are you using to read these?  It looks like a 44
> pin chip; do they sell an adapter for it, or is it DIY?  Also if someone
is
> going to dig deeply into this, I would suggest starting with the 99 and
> newer box.  The 97-98 LS1 PCM was obsolete after 98, while the 99 and up
> covers the Gen 3 truck engines as well as the LS1's. Although I don't know
> for sure I am guessing the new L18 big block (8.1L ,496 C.I.) probably
uses
> this same box since it is 24X, SFI, and coil per cylinder like the above
> engines.
>
> John
>
>  >Bob wrote:
>  >>
>  >> I have recently gained an interest in having the ability to custom
program
>  >> the LS1 ecm. People are obviously doing it but there doesn't seem to
be any
>  >> "end user tools" yet. Reviewing the list for the last couple of months
> I saw
>  >> that Andrew K. Mattei was getting into the flash memory of an LS1.
Andrew
>  >> can you tell me where you are with this?
>  >
>  >
>  >I got the chip off the board, put it in the programmer, and read "FF"'s.
>  >Need to do some troubleshooting on my piggyback board. Those chips are
>  >VERY fragile, so I hope that I didn't break anything. I don't think I
>  >did, but still need to do some looking.
>  >
>  >> As I understand it the obd2 specification requires encryption of the
data
>  >> going to / coming from the ecm. Has anybody broken this encryption?
>  >
>  >
>  >None of us, AFAIK. Steve Cole, yes. Hypertech, yes. Us (anyone on this
>  >list, AFAIK), no.
>  >
>  >> If the encryption has not been broken that means the flash memory must
be
>  >> accessed directly. From what info I have been able to gather (having
not
>  >> opened an ecm (yet)) the flash memory is surface mount technology.
Does
> that
>  >> mean that the current "turners" are unsoldering, reprogramming,
resoldering
>  >> the surface mount flash memory chip (doesn't sound like fun to me!).
Maybe
>  >> there is some other way, I hope.
>  >
>  >
>  >No, they are not desoldering. I do not see how you could successfully
>  >remove, program, resolder one of these chips without coming close to
>  >frequently breaking them. It's that fragile.
>  >
>  >> I also see that Steve Cole has this power loader there appears to plug
in
>  >> somewhere. Does anybody know how this works.
>  >
>  >
>  >I've talked to him about it. You tell him what you need for your LS1, he
>  >ships you a custom program built in to a Powerloader. You plug it in to
>  >the car, hit a button, and bam, that's it. No options, no reversal. If
>  >you need something changed, you send him the powerloader, he changes
>  >stuff, he sends it back, you hit the button, bam. It's programmed. It's
>  >basically a one-shot device, unless you need a reprogram. It beats
>  >having the PCM lost in UPS land for days, though.
>  >
>  >
>  >- -Andrew
>  >-
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