|
I honestly don't understand what just datalogging does for anyone without the ability to change something if need be, besides being able to see trouble codes and/or diag something like a faulty sensor, lean/fat issues, etc.
GM does it like this:
Block Learn Multiplier (BLM) is what is known as long term fuel trim.
Integrator (INT) is known as short term fuel trim.
When the car hits closed loop, meaning the oxygen sensor is warmed up, the computer will begin to adjust the fuel trims to make an attempt at maintaing stoich. Like pampered-z said, 128 is the middle. 128 is what would be considered perfect fuel trim.
The integrator will make very fine adjustments to the 128 BLM cell, and once it reaches its max either rich or lean, it will move a BLM cell up or down accordingly, and reset itself back to 128. This process goes on over and over and over and over. When the block learn number goes up passed 128, it means the vehicle is lean, and is adding fuel. If it falls below 128, it means it is rich and subtracting fuel.
Other things you may want to pay attention to, knock count, knock retard, spark advance, etc.
But like I said i dont see what datalogging alone is going to do for you.
__________________
87 iroc with the usual go fast stuff
heavier than your half ton.
|