[Gmecm] BLM cell confusion

[WopOnTour]

Gary
Nah, you're kidding right? I realize the $88 and $1A calibration details 
concern itself with cells 0 and 1 a lot for as these are idle cells, but 
I've had a TECH1 scan tool on hundreds of those V6s and the BLM cell PID 
varies between cell 3 and cell 15 at road loads. What scan tool do you use??

Also, what difference does the style crank triggering make to the ECM? 
That's all resolved by the DIS module itself AFAIK (well except on the newer 
OBDII models where the CKP is hardwired directly to the ECM) On the 
122730/727 the ECMs onlly connection to the ignition system is the EST and 
BYPASS and the ECM doesnt care what triggering methods (distributor or DIS) 
are being employed, as the CKP is connected to the DIS module not the ECM.
Please explain
WopOnTour

----- Original Message ----- 
From: "Gary Evans" <gary at garyandliz.com>
To: <gmecm at diy-efi.org>
Sent: Sunday, November 13, 2005 1:13 AM
Subject: Re: [Gmecm] BLM cell confusion


> No really, they exist. The $a1 and $88 masks for the 2.8 / 3.1 V6  engines 
> use only 3 cells. There are probably others, used primarily  on "low 
> budget" applications. The customary masks to work with ($8d  for example) 
> are performance oriented, so the 16 cell calibrations  are better known in 
> the GMECM community but 16 cells are by no means  standard across all 
> applications.
>
> If I was going to start from scratch on my project again, I would 
> definitely try to use one of the other masks that offer the usual 16  BLM 
> cells. IMHO, the $a1 and $88 code bases are sloppily written and  not very 
> easy to tune. I am no assembly expert, but from the work I  have done on 
> the $a1 hac, the code appears to be a mess. Example: the  injector 
> constant is part of one of the EGR tables. yeah.....
>
> However, I need the 6+1 crank trigger DIS, and as far is I know $88  $8F 
> and $A1 are the only masks that support it out of the box on the  V6. If 
> there is another mask that supports 6+1 crank trigger, DIS,  *and* 16 BLM 
> cells, I would love to hear about it because I am  getting the itch to do 
> more tuning on my car, and I might be inclined  to try something new if it 
> offered better tunability and cleaner (or  maybe just better documented) 
> code.
>
> -Gary
>
>
> On Nov 12, 2005, at 9:05 PM, WopOnTour wrote:
>
>> Gary
>> This post has me a bit stumped
>> What about the other 13 cells?
>> Don't ALL of the OBDI calibrations use at least a full 16 cell BLM  map? 
>> (4cells by 4cells) Cells 0 thru 16 ??
>> I know some others like the Quad4 ECMs use 16 PLUS and additional 4 
>> cells (17-20) that depend on "in-gear" state and AC clutch status.
>> I've never heard of a GM calibration with only 3 cells...
>> WopOnTour
>
> _______________________________________________
> Gmecm mailing list
> Gmecm at diy-efi.org
> http://lists.diy-efi.org/mailman/listinfo/gmecm
>