[Gmecm] BLM cell confusion

[Gary Evans]

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