[Gmecm] 7747 real-time tuning

[Programmer]

I can't say I've actually ever had the same problem, so I suggested an 
alternative method.

Lyndon.

----- Original Message ----- 
From: "Mark Romans" <romans at starstream.net>
To: <gmecm at diy-efi.org>
Sent: Tuesday, March 21, 2006 8:23 AM
Subject: Re: [Gmecm] 7747 real-time tuning


> My Tunercat RT Emulator plugs in the AA for me while tuning so the check 
> sum is disabled.
> 6E  (1989 TPI).
> Mark
> ----- Original Message ----- 
> From: "David Allen" <davida1 at hiwaay.net>
> To: <gmecm at diy-efi.org>
> Sent: Tuesday, March 21, 2006 7:33 AM
> Subject: Re: [Gmecm] 7747 real-time tuning
>
>
>>  This maybe comparing apples to oranges but... When using my Romulator 
>> and
>> Cats' RT Tuner I get intermittent code for EPROM error.  Never get a SES
>> light but after tuning session, if I pull codes that one is in there. Has
>> not caused any issues with the operation of the ECM or tuning hardware.
>>  Whenever you adjust the contents of the emulator, the RT tuning software
>> adjusts the parameter you tweaked, and updates the checksum at the same
>> time. but somehow the code still sets intermittently.
>>  Now I have not tried to read ALDL data during tuning because one of my
>> computers now has a dead com port :-(
>>  Later,
>> David
>>
>>
>> ----- Original Message ----- 
>> From: "Charles McDowell" <charles at taildragger.info>
>> To: <gmecm at diy-efi.org>
>> Sent: Tuesday, March 21, 2006 5:30 AM
>> Subject: RE: [Gmecm] 7747 real-time tuning
>>
>>
>>> I'll give this a shot and see what happens.  If it works, I'm confused
>> about
>>> how it ever worked with the emulator, since I've never had the checksum
>>> disabled, and I was tuning in real time (and seeing BLM's) for a while.
>>>
>>> Thanks.
>>>
>>> -----Original Message-----
>>> From: gmecm-bounces at diy-efi.org [mailto:gmecm-bounces at diy-efi.org] On
>> Behalf
>>> Of Programmer
>>> Sent: Monday, March 20, 2006 12:21 PM
>>> To: gmecm at diy-efi.org
>>> Subject: Re: [Gmecm] 7747 real-time tuning
>>>
>>> To start, set byte $04 to "AA" instead of "42".  This will set a 
>>> 'checksum
>>> ignore result'.
>>>
>>> I'd think code 51 and no BLM updates would be hand in hand...pretty much
>>> anything in the code would be ignored with code
>>> 51 set.
>>>
>>> Lyndon.
>>>
>>> ----- Original Message -----
>>> From: "Charles McDowell" <charles at taildragger.info>
>>> To: <gmecm at diy-efi.org>
>>> Sent: Sunday, March 19, 2006 7:22 PM
>>> Subject: [Gmecm] 7747 real-time tuning
>>>
>>>
>>> > I'm working on tuning my Blazer with transplanted 7747.  I got an
>>> > "Ostrich"
>>> > from Moates.net and I'm using Tunerpro RT to do adjustments with the
>>> > engine
>>> > running.  I'm monitoring things with WinALDL since I'm used to that.
>>> >
>>> > One thing that's happening is that I'm getting a code 51, "PROM 
>>> > error".
>>> > What does this mean?  At first I thought bad checksum, but I don't 
>>> > think
>>> > that's it, because I've had bad checksum before, and it results in a
>> rapid
>>> > flash on powerup and SES light, neither of which I get in this case.
>> The
>>> > engine starts right up with no SES light or anything, I just see the
>> code
>>> > 51
>>> > in the ALDL data.  What else could it be?
>>> >
>>> > Another question I have is why I don't always get BLM value updates.
>> For
>>> > example, I was tuning in my 800/40 VE cell and I upped the idle to 
>>> > 1200
>>> > RPM
>>> > to try and see what was happening in that cell.  Once I got to 1200 
>>> > RPM,
>>> > WinALDL showed no BLM or INT data.  The system was still closed loop 
>>> > at
>>> > the
>>> > time.  What decides whether BLM values come out or not?
>>> >
>>> > Thanks for any help.
>>> >
>>> >
>>> > _______________________________________________
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>>>
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>>
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