[Gmecm] Re: direct injection/code libraries

[Darren Freed]

I don't know for sure about the N* box.  The one I have coming is a 96, 
and externally looks the same as the v6 boxes.  I'm hoping that it is 
similar internally as well, in terms of the basic chipset. :)

The IAC control for most OBDII stuff I have looked at is airflow based, 
rather than rpm based - that gives a much more stable idle, especially 
if you've made mods to the engine.  The down side, is that a MAF sensor 
is essentilly required (vs optional).  Calculated airflow, based on RPM 
and MAP (among others) fluctuates ALOT, and thus a stable idle is much 
more difficult to achieve (although not impossible).

darren



William Lucke wrote:
> It seems to have taken GM a long time to get their act together, but the 
> logical way to handle all the different programs that GM has to keep 
> track of is in a development library like a software development firm 
> would have. Once they did get that together, I'd expect almost all the 
> major modules from all programs to be VERY similar if not identical.
> 
> Isn't the OBDII N* computer some strange Siemens box? Is it related to 
> the other GM OBDII computers?
> 
> I'm curious about the IAC routine on the OBDII N*'s... I'd like to port 
> that back to the OBDI computer so that I don't have to have an idle 
> speed motor and closed throttle switch to use the OBDI N* controls.
> 
> 
> 
> Will
> 
> 
> 
> 
> ********
> 
> From: Darren Freed <darrenfreed at shaw.ca>
> Subject: Re: [Gmecm] Re: direct injection
> 
> I'd love to.  I'd also love to have a look at the 5.3 DOD code (while
> we're dreaming)...
> 
> I've get the 96-97 v6 software pretty well figured out.  I've got a 96
> N* computer in the mail, and hopefully will have that figured out at
> some point as well.  I've looked at alot of code, v6 and v8, from 96-05,
> and it is suprisingly similar.  Almost plug-n-play, in terms of being
> able to select this, and deselect that, etc.  The 4cyl stuff is a bit
> different, though...
> 
> My ultimate goal (when I finally get some time) is to "port" the efi332
> software to these '332 based PCMs.  Then you could do whatever you want
> in terms of programming.
> 
> darren
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