[Gmecm] Acquiring ECM schematic

[Tyler Townsley]

You can still get a rebuilt zr1 ecm with your core(all years have been 
superceeded with one number, just use your year specific eprom). So 
someone out there has the spects as it not GM doing the work. There is a 
complete hac for the 90-91 calibration. A 90 zr1 is a steal right now. 
Parts and info is avaiable on the zr1 net and corvette forums.

Tyler

Ryan Hess wrote:

>Lets try this again...  my first message bounced from the mail server.
>
>I may have acquired an 8331.  Anybody wanna see what's inside?  :D  
>Anybody want anything specific done?  I was thinking about taking high res 
>pics, and putting them up on the DIY-EFI ftp or something.  Don't know 
>how, but I don't have it yet...  I'm trying to get the wiring diagram 
>as well.
>
>in re: the OBDII...  All we really need is someone to leak the source 
>code for one. 
>
>Ryan
>
>davesnot
>
>
>davesnothereman at netscape.net wrote: AFAIK The 8331 guys have to stick together.  When Chevrolet announced 
>no more parts for the ZR1 everything suddenly disappeared.  I suppose 
>the guys who can afford that car can also afford the parts?  It must be 
>really tough if you're not a resident of the US.
>
>I have to think the wise answer is to move on to the next generation of 
>engine control hardware, at least for us.  The later pcm's have more of 
>everything... but we really aren't using them.  Why?  Same old story.  
>Not enough info about the code, not enough tools to work with them.
>
>It's really, really too bad that GM / Delco / Delphi never saw fit to 
>release a reasonably priced aftermarket ecm.  Even an "offroad only" 
>limited function code for a specific OBDII pcm would have been nice.
>
>Zaphod
>
>-----Original Message-----
>From: Ryan Hess 
>To: gmecm at diy-efi.org
>Sent: Thu, 8 Jun 2006 13:25:19 -0700 (PDT)
>Subject: RE: [Gmecm] Acquiring ECM schematic
>
>   Wow, I did not know that.  I can't imagine going through a 4 layer 
>board, and
>worse, trying to figure out what IC does what.
>
>Who would you suggest I request information from?  Delphi?  Who built 
>their
>early 90's OBDI ECM's?
>
>As sort of an aside, GM stopped making/supporting the 1228331 ECM found 
>on ZR1
>vettes and the turbo lotus.  There was another part # that superceeded 
>it, but I
>believe it too had been discontinued.  What are those people to do?  
>They don't
>exist in junkyards (I've looked), and there's *one* on ebay for nearly 
>$600.  If
>GM doesn't release the schematic for it, wouldn't they be out of luck?
>
>This secretive environment is just terrible.  These things are 
>approaching 15-20
>years old now.
>
>
>
>davesnothereman at netscape.net wrote: Ryan Hess  wrote:
>
>  
>
>>Question: how have ECM schematics been acquired in the past? ???the
>>7730/49 on ludis' site, etc?
>>    
>>
>Old fashioned reverse engineering.
>
>  
>
>>I'm in contact with an ECM remanufacturer, who
>>presumably has a great deal of knowledge locked away somewhere. ???The
>>question is, how do I coerce it out of them? ???
>>    
>>
>
>Maybe you should request information as an ecm remanufacturer?  There 
>are a few
>rebuilders, they must have obtained information in some way.
>I'm specifically looking
>  
>
>>for a schematic of a '2240.
>>
>>
>>I have to assume this is like the TV repair business, where the mfr
>>charges a fee for access to their schematics..
>>    
>>
>
>They may not release schematics at all.  GM is a provider of rebuilt 
>ecm's.
>They have no need to support the business of repairing and rebuilding 
>computers.
>
>I know that it's easier to pull a hen's teeth than obtain Delco service
>information for audio products, even those which are 15 years old.  And 
>once you
>get service info, finding parts is even tougher.
>
>Zaphod
>
>
>
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