[Gmecm] P6 ECM information?

Sun Apr 9 09:47:02 UTC 2006

The code that's commonly used has multiple cylinder options.  But there 
is plenty of code which is dedicated to the engine it was designed for. 
  The breakdown isn't hardware specific.  One version of code used with 
the 7749 is multi-engine friendly, another is dedicated to 4 cylinders 
only.  Same with the 165.

It would be neater to see more OBDII stuff.

The ZR1 used different part number ecm's and different masks.  Finding 
the ecm for one of these cars probably will be quite tough.  ZR1 guys 
are usually willing to pay good money to have spare parts.

Zaphod

-----Original Message-----
From: Ryan Hess <rgmecm at yahoo.com>
To: gmecm at diy-efi.org
Sent: Thu, 6 Apr 2006 21:15:00 -0700 (PDT)
Subject: RE: [Gmecm] P6 ECM information?

   It may be better than *writing* assembly, but makes it close to  
impossible for
us to undo their thoughts.  On the ASICs, does this  mean that we're 
stuck using
whatever crank reluctor and # cylinders  they're originally intended 
for?  In
otherwords, with the 7730,  you can just change the cylinder select and 
run
anything.  If the  timing logic is in the hardware, and built for one 
specific
app,  doesn't that mean that they're no longer universal?

   Now here's my deal - I very much like the GM code.  They've spent  
their money
to make it run an engine in all conditions.  I scanned  over the EFI332 
stuff,
and it's not what I want.  It appears to be  similar to the megasquirt 
project.

   It seems to me like the LT1 computer with the flash prom would be a 
good base
for an aftermarket type computer.

  Ryan

Steve Ravet <Steve.Ravet at arm.com> wrote:  I've never used modula so 
can't
comment, but anything is better than
writing assembly.  I say that as a person who does some of that for a
living.  It still comes down to assembler in the end, it's just that if
it was originally written in a higher level language and compiled it
will be more difficult to figure out what is actually going on.
Especially since compilers tend to optimize things away, and reorder
code to speed things up.

Another thing to keep in mind is that the 32 bit computers have 2 asics
in them that handle a lot of the fuel and ignition related I/O.  Neither
the ignition outputs nor the fuel outputs are driven by the CPU.  Both
come from the asics, called CIC (configurable ignition controller) and
TIO (timer I/O).  CIC interfaces to the 18x and 3x position sensors,
sends the data to TIO.  TIO acts like a distributor for DIS apps, and
also schedules fuel delivery.  The CPU communicates with these on a
higher level by programming advance, injector pulsewidth, etc.  The
asics figure out the details.  TPU is used for things like evap purge,
IAC, linear EGR, etc.

I think these boxes are a great starting point for home grown code, but
there's a lot that needs figuring out, particularly the TIO and CIC.  I
think it'd be fantastic to get the efi332 code bases compiled and
running on a GM box.  Maybe it can be done by ignoring the CIC and TIO
and just using the TPU.  Or maybe you can be the guy who figures out the
CIC and TIO!

730 won't do sequential because it doesn't have enough drivers.

regards,
--steve

> -----Original Message-----
> From: gmecm-bounces at diy-efi.org
> [mailto:gmecm-bounces at diy-efi.org] On Behalf Of Ryan Hess
> Sent: Thursday, April 06, 2006 5:39 PM
> To: gmecm at diy-efi.org
> Subject: RE: [Gmecm] P6 ECM information?
>
> I'm working with the 7730 right now, and would like some
> extra code  space and processing power.  I'd like to be able
> to experiment a  bit...  For instance, I'd like to be able to
> toggle between batch  fire and sequential to see the
> differences in fuel economy and idle  quality.  Is it worth
> it to an average user?  I don't  know...  I think it would be
> neat to find out.  The 7730  isn't fast enough to do
> sequential... at least I don't think so.   It appears to be
> pretty bloated as-is.  I'd also like some more  I/O available
> to add some extra features.
>
>   Modula doesn't sound very nice.  Aside from getting the
> source code, is there any way around the compiled code?
>
>   Ryan
>
> Steve Ravet  wrote:  Ryan, are you
> writing your own code that you've run out of memory and CPU
> cycles?  The 32 bit computers should have plenty of both, and
> there are tuners available for them.  tunercat has a package
> for the 96 and 97 pickups, and probably others as well.  I'm
> currently working on a USB<-> VPW cable that can be used for
> scan tool and reflashing functions on these computers.
>
> These computers are programmed in a version of modula, so
> there won't be any commented disassemblies.  I do have some
> information on the internals of these PCMs, I need to get it
> posted one of these days.
>
> --steve
>
> > -----Original Message-----
> > From: gmecm-bounces at diy-efi.org
> > [mailto:gmecm-bounces at diy-efi.org] On Behalf Of Ryan Hess
> > Sent: Tuesday, April 04, 2006 9:28 PM
> > To: gmecm at diy-efi.org
> > Subject: [Gmecm] P6 ECM information?
> >
> > Hi everone,
> >
> >   I'm investigating possible upgrades for my P4 computer.  At the
> > moment it doesn't have enough processor power or free
> space.  I  found
> > some information about the P6 family with dual processors
> and a  27512
> > eprom and/or flash memory.
> >
> >   Now as far as I know, these are the ECMs you'd find on the OBDII
> > LT1's  and other cars.  Or maybe I'm all mixed up and what
> I'm really
> > talking about is a P66?
> >
> >   At any rate, if the dual processor ECM is the LT1 ECM, I
> know these
> > have been hacked, or at least enough to create the programs
> out there
> > such as LT1edit (?).  Are there any commented
> disassemblies???  Maybe
> > more importantly, are there any schematics  of these ECMs?
> Or ANY ECM
> > a few steps above the P4?
> >
> >   Thanks,
> >   Ryan
> >
> >
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