AFR control by MAF and VE table combined?

[67SS509]

On a LS1B style pcm what do you log to determine how much of the calculation is coming from the MAF versus the VE table to control AFR? Also does the MAF really control totally after 4000 rpm's? Been wondering about this for a long time.

[joecar]

You can perform an experiment by zeroing out the VE table...

so if above 4000 rpm the PCM for some reason uses the VE table you will see a drastic change in logged cylinder airmass;


I talked to some people who said they have seen this in a few situations (possibly the exceptions to the rule).

[spy2520]

I at one point set that value 400 and later disconnected the maf. The car would start and immediately shut off. Makes sense.