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

[trax]

Mike,

When comparing WinBin and TunerCat I find that many things differ.  Geez -
where do I start:

Fan Temps are completely different.
RPM fuel cut and return are different
Cold, Warm, and Hot closed loop timers are different

and ...

INJECTOR FLOW RATE is different.  TunerCat programmed for 24.1lb/hr ...
WinBin shows 2.56 g/s = 20.3lb/hr

These are the noticeable ones.  I am using the .ECU file that I believe you
sent me via e-mail ... or pointed me to the correct website.  TunerCat
doesn't use .ECU files.

I haven't had any problems with TunerCat and it is much easier to use.  I'm
getting pretty close to my 31 day trial period so I am pretty sure that I'll
be purchasing it.

Tim



>-----Original Message-----
>From: owner-gmecm at diy-efi.org [mailto:owner-gmecm at diy-efi.org]On Behalf
>Of Michael Davis
>Sent: Tuesday, June 13, 2000 10:52 AM
>To: gmecm at diy-efi.org
>Subject: ECU file format bug or gray matter loss? [was Re: Idle Block
>Learn Cell ??]
>
>
>
>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
>>> >
>>> > =====
>>> > Trains, Trucks, and EFI at
http://www.trailrunners4x4.org/users/realsquash
>> >
>> > __________________________________________________
>> > Do You Yahoo!?
>> > Yahoo! Photos -- now, 100 FREE prints!
>> > http://photos.yahoo.com
>>
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>
>=====
>Trains, Trucks, and EFI at http://www.trailrunners4x4.org/users/realsquash
>
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