[Gmecm] 7747 real-time tuning

[Mark Romans]

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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