[Gmecm] 8746 ECU help

[David Allen]

> > First time posting to this forum, so please excuse my ignorance.  I have
> > been "lurking" for awhile and I believe more than enough talent is here
to
> > put me in the right direction.  Hope you guys can help.
>
> I'm new here also, and my car also has an 8746.  I'm using CATS RT and a
> Transtronics ROMulator for adjustments. Do you know what the production
code
> for your BIN file is?  Mine started life an a 1991 Camaro 5 speed 305
coded
> APTY.
>
> > I have installed an 8746 ECU in my '82 vette with a *prominator* to
allow
> me
> > to tune w/o burning chips.  This is great and in conjunction with Win
ALDL
> > and TunerPro I can make changes I think are appropriate for my motor.
>
> What engine do you have in your Vette, how close dows it match what the
BIN
> file was originally developed for?
>
> > I
> > have an 8746 definition file, but my problem is that I lack "layman's"
> > definitions for what the files actually do-in some cases.  Let me see if
I
> > can give an example of the type of help I am looking for...just an
> example:
> >
> > "BLM enable min temp threshold"  My head tells me that this would be the
> > temperature the engine needs to reach for freedback from the O2 sensor
to
> > start computing BLMs for the ecu to BEGIN correcting for Rich/lean
> > conditions.  So I look at value in bin and it's 189!  can't be what I
> think
> > it means as car runs mostly cooler than this.
>
> I can't find this value in either WinBin or CATS RT, for the 8746.  The
> closest thing is Min Temp for Closed Loop. This value is 54.4?C in this
> calibration.
>
> > "BLM enable max. temp threshold"  Sounds like the MAX. temp that the car
> > might reach where the BLM's would no longer be adjusting the BPW.  Look
at
> > value in my bin...it's "zero"  WTF??????  Zero can't be a max temp.  Do
I
> > have it backwards???
>
> Strange.  Can you look at the definition file and see what address in the
> EPROM this parapeter is stored in?
>
> > Is there anywhere I can get a plain language
> > definition of what these various parameters do in real life?  I am
looking
> > specifically for the 8746 ECU.
>
> This one doesn't appear in either of the above programs either.  The only
> min/ max pair I can find for BLM enable is Min MAP and Max MAP for BLM
> Enable.
>
> What kind of definition files does TunerPro use?
>
> > I have a hand-me-down 8746 starter bin file that the car runs fair with,
> but
> > I don't want to tune by the Braille method!  Anyone nwrite "tuning for
> > dummies"?
> >
> > Bill
>
> Sorry I couldn't be of much more help.  All the values I found when tuning
> my cars with 8746 and 6869 ECM's were beleivable values that made sense.
> Could your BIN or the TunerPro definition file be mismatched somehow?
>
> Later,
> David
>