[Gmecm] More '730/$8D tuning questions...

Mon Apr 23 23:17:48 UTC 2007

Have you tried using another eprom?  From my experience, I bought 2 eproms 
when I started programming a 89 TPI '165' ecm.  After about 5 turns on 
swapping eproms (save the old program, try a change) one eprom would not 
control the engine properly (cooling fan turns on with ignition, engine will 
not idle, backfires under acceleration, etc.) but the other eprom with the 
same program runs great and has been through about 100 burns or more to 
date.  Like you with the bad eprom, I cannot get any codes other than 12.

Roger

----- Original Message ----- 
From: "Clair Davis" <clair.davis at charter.net>
To: <gmecm at diy-efi.org>
Sent: Sunday, April 22, 2007 8:50 PM
Subject: Re: [Gmecm] More '730/$8D tuning questions...

> Well, I'm at a loss.  I've tried to copy over the necessary bits of my
> previous tune attempts (injector size, displacement, etc) to both AXXC and
> AXXD, supposedly known-good 5-speed .bin's, and in every case, they drop 
> in
> to limp-home mode almost instantly.  The only code I can retrieve is 12,
> ECM, so something is very seriously wrong.  If I'm switching .bin's on the
> fly, I can upload my old last attempt, and all gets better.  SES/CEL goes
> out, mixture leans out to stoich +/-, and MAP jumps up in to the mid 40's.
> I've been through almost all of the various items you can edit through
> TunerProRT, and anything obviously strange is evading me at this point.  I
> think about all I can do is go through the various tables that appear
> related to an auto trans in my .bin and copy in the parts of the 5-speed
> .bins I have (AXXC/AXXD/.  I don't know what that will really do for
> drivability, but at least it makes it a bit more "right".
>
> Now for the question.  My gut feeling is that I need to seriously adjust 
> my
> Accel and Power Enrich functions to make this thing more drivable in the
> near term.  I believe this is the case because when the car is in warm-up
> mode, throttle response and transition is pretty dang good, but AF is in 
> the
> 11-12 range.  I think that's fat enough to cover most enrichment sins 
> until
> it goes to closed loop.  Where can I find a good description of the
> variables in these functions?  I need to be able to change the variables
> that make the greatest contribution to the adjustment factor.  So far, the
> XDF file for TPRT hasn't really given me what I want, and the book I got
> from Customefi's has only discussed the BPW this way.
>
> I'm eventually going to need the same formula info for the spark advance,
> but I think PE/AE is the big problem at the moment.
>
> Thanks again,
>
> Clair
>
>
> ----- Original Message ----- 
> From: "Clair Davis" <clair.davis at charter.net>
> To: <gmecm at diy-efi.org>
> Sent: Friday, April 20, 2007 8:40 PM
> Subject: Re: [Gmecm] More '730/$8D tuning questions...
>
>
>> Robin,
>> On googling, I found this thread on 3rd Gen.org regarding a corrupted 
>> AXXC
>> that's out in the wild.  The ALDL function (or lack thereof) seems to be 
>> a
>> common issue.  Here's the thread:
>> http://www.thirdgen.org/techboard/diy-prom/409989-axxc-bins-no-good.html
>> They provided a link to an apparently good version, which I'll download
> and
>> compare to another that I have stored.  I made a point shortly after
> getting
>> my hardware/software of collecting as many bin's as possible for 
>> reference
>> purposes.  I'm fairly sure my "bad" AXXC came from the same sources 
>> listed
>> in the TGO thread.  It looks like another option is to go with AXXD.
>>
>> Also, FWIW, the two .bin's I supplied that have the top vector set to
> $0000
>> are related.  The AFI bin is the original I pulled from the tweaked 
>> memcal
>> provided to me based upon my stated requirements, and 003 is the result 
>> of
>> my changes to that file, specifically in injector size, cylinder vol,
>> timing, and VE tables.  They should otherwise be nearly identical.
>>
>> Clair
>>
>>
>> ----- Original Message ----- 
>> From: "Robin Handley" <Robin at FuryWorld.fsnet.co.uk>
>> To: <gmecm at diy-efi.org>
>> Sent: Friday, April 20, 2007 2:45 PM
>> Subject: Re: [Gmecm] More '730/$8D tuning questions...
>>
>>
>> > Interesting.
>> >
>> > Clair sent me 3 .bins, which I have each compared byte-for-byte with
> ANHT.
>> >
>> > The .bin that calls itself AXXC differs massively from ANHT ($8D), 
>> > right
>> > through (including code). This indicates to me that the .bin calling
>> itself
>> > AXXC isn't $8D. Is this a fair conclusion, or are there different code
>> > versions of $8D?
>> >
>> > The other bins only differed from ANHT in the calibration area, but 
>> > both
>> had
>> > the top (warm start?) vector set to $0000, whereas ANHT has it
> (correctly,
>> > IMO) set to $B000. Should these two bins run at all?
>> >
>> > Certainly, since all their code is the same as ANHT, AIUI their ALDL
>> should
>> > behave exactly the same as ANHT, and I've used ANHT ALDL w/o any
> problems,
>> > with ALDLMON and my own s/w. Have I missed anything?
>> >
>> > Robin
>> >
>> > _______________________________________________
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>> >
>>
>>
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>
>
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