My head is spinning from the stickies. i'm trying to apply the 165 info to my 870 ecm. Should i be alble to log LOAD or do i have to manually calculate it?

 

It doesn't look as though the LV8 is included in the data stream. The value can be calculated from the RPM & airflow. These are included in the data stream. The LV8 value is basically the airflow divided by the RPM.

RBob.

 

RBob,

thanks for you reply, i have been reading some of your other post where you show the calculation as being:

LV8 = (((DRP * gms/sec) / 256) * Scalar) / 64

i'm getting #'s bigger than 256 using this calc. for example my RPM is 2625 & my airflow is 23637 from tunerpro. I dont know what the units are however, i assumed it was 236.37g/sec, but that could be where i'm off base.

does anyone know what the units of airflow is coming from tunerproRT on an 85 870 ecm?

thanks for the reply

 

where do you find what is included in the data stream? i've data logged bytes by editing the aldl file that are not included in the basic aldl file & there is additional data, but i dont know what it is.

 

The DRP is the inverse of RPM. For a V8 it is:

DRP = 983040 / RPM

So 2625 RPM is 374 DRP

The airflow is gms/sec * 256, for 23637:

gms/sec = 92.3 = 23637 / 256

For a scalar IIRC ARAP uses 80, so we'll try that. Using the equation from above:

LV8 = (((DRP * gms/sec) / 256) * Scalar) / 64


LV8 = (((374 * 92.3) / 256) * 80) / 64

is: 169 for LV8

RBob.
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There is a zipped file that lists the ALDL data streams around. Check moates.net/fileman. I believe your ECM is stream A28.

RBob.

 

thanks Rbob, i really appreciate you helping out a beginner.

the airflow = gm/sec * 256 was the part i was missing. thanks much, now i can create a spread sheet to import into that will calculate the load for me.

much appreciated!!!!!!!!!!!!