ECU file format bug or gray matter loss? [was Re: Idle Block Learn Cell ??]

[Squash]

What is the formula u r using?  I was trying to get that figured out last night, but it looked
like it was only used at open loop (41C)?????

Squash

--- Michael Davis <davis at mail.eecis.udel.edu> wrote:
> 
> I don't know if this has been hashed out before, but I can't see, to
> rationallize the conversion limits of the .ecu file format for an
> equation of the form:
> 
> 	eprom-value = constant / converted-value
> 
> It appears to me that the .ecu files are setup to either multiply or
> divide the eprom-value by a constant, but don't have provisions for
> doing the 1/x inversion as needed above..  Am I missing something?
> 
> I found this bit me in the A$$ twice now with the 7730v3.ecu file 
> with both the AFR and the base injector (g/s) settings..
> (I've been tweaking down VE tables for 3 months trying to lean out the
>  motor and just found that my first setting of 24lb/hr injectors was
>  actually in the eprom as 18lb/hr because of the conversion...)
> 
> (I was using WinBin, but don't believe it to be the problem...)
> 
> mike
> 
> In message <20000613143134.9794.qmail at web121.yahoomail.com>,Squash writes:
> >I figured it out yesterday...  The original idle speed for an aujp is 600, min
> >e is now set to 800
> >rpm.  I made the mistake of having a chip done by a S&P, and now i'm fixing al
> >l the stuff they did
> >wrong (like they didn't change the VE table or idle BLM cell, etc).
> >
> >There is a bit in the anht_hac that says something about disabling "CCP" at id
> >le, is CCP a learn
> >mode?  
> >
> >My setup has run 10 out of 16 cells, but i'm sure i can get into the rest if I
> > try...
> >
> >Now my problem is the BPW.  I switched the idle cell to 13 (the correct one fo
> >r 800rpm/50kpa) and
> >now I can actually tune it.  But it appears that I can't take enough fuel out,
> > so I dropped the
> >BPW to 5.008 from 6.7 (location 41A).  That had the desired effect, (leaning i
> >t out), albeit a bit
> >too much.  But the commanded AFR now reads 19.9:1.  I think maybe I should cha
> >nge the injector
> >flow (41C) instead, but i don't quite understand what effect that will have.  
> >I'm scanning the
> >archive files now.
> >
> >Any ideas?  I've found the spots in my VE maps that need to have the least fue
> >l and I need to
> >bring it all down a notch.
> >
> >Thanks,
> >Squash
> >
> >--- rr <RRauscher at nni.com> wrote:
> >> 
> >> (With the pulling of fuel not affecting your idle, double check that
> >> you are changing the right area. All it takes is setting up the .ecu
> >> file incorrectly, been-there, done-that).
> >> 
> >> As for the blm idle cell=4, it is sometimes difficult to understand why
> >> gm does things. If I had to guess, it would have to do with drivability.
> >> Maybe to prevent a drastic change in an area that is then used when
> >> 'coming' off idle. Maybe to prevent a rough idle from switching between
> >> two cells. On the '747, certain conditions will prevent an int reset to
> >> 128 when the cell selection changes. Like whether the O2 is sensing a
> >> rich condition, or the ecm is in decel enleanment.
> >> 
> >> How many other cells have you seen in use? Are all sixteen used, or
> >> just a couple? AZTY 730 v6 bin only uses three cells, idle, cruise and
> >> a decel cell. That's all I've ever seen used. Other bins use two cells,
> >> throttle open, and throttle not open.
> >> 
> >> hth's
> >> 
> >> BobR.
> >> 
> >> Squash wrote:
> >> 
> >> > While doing some tuning this weekend, I decided to work on the idle.  It's
> > been running
> >> > 51kpa/800rpm with 4/108/100 cell/blm/int.  I went into the lower VE table 
> >(aujp) and around
> >> > 800rpm/51kpa I pulled fuel out, which had no effect on my idle!  So I chec
> >ked around the ANHT
> >> hac
> >> > and there is a setting for which cell to use at idle.  It was set to 4, an
> >d I had assumed
> >> > something else, so I was wrong there.  But 4 is *not* where 800/51 is loca
> >ted.
> >> >
> >> > Why would I want to use cell 4 for idle?
> >> >
> >> > Squash
> >> >
> >> > =====
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> >> >
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> >
> >
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