I wanted to answer the question: Why is there a mass airflow parameter that can be datalogged if the MAF sensor is not being used?
The speed density on these cars is much more than a MAPxRPM VE table. It uses a quadratic equation based on many parameters to use RPM to find a parameter that is basically airflowmass/pressure.This is done for every combination of camshaft angles as well. But this is measured not in airflow/time, but actually airflow/event (basically standardized per RPM, not time) and then basically is multiplied by rpm/2. (There is one intake stroke for every 2 Revs). This is how the ECU can give you airflow mass without a MAF sensor. The ecu needs to know airflow mass to know how much fuel to inject. You can also work backwards from fuel injected amount and AFR to find airflow.
TLDR: Speed density still measures airflow.
Also, if you unplug the MAF you get a AIT sensor CEL, not a maf sensor CEL.
The speed density on these cars is much more than a MAPxRPM VE table. It uses a quadratic equation based on many parameters to use RPM to find a parameter that is basically airflowmass/pressure.This is done for every combination of camshaft angles as well. But this is measured not in airflow/time, but actually airflow/event (basically standardized per RPM, not time) and then basically is multiplied by rpm/2. (There is one intake stroke for every 2 Revs). This is how the ECU can give you airflow mass without a MAF sensor. The ecu needs to know airflow mass to know how much fuel to inject. You can also work backwards from fuel injected amount and AFR to find airflow.
TLDR: Speed density still measures airflow.
Also, if you unplug the MAF you get a AIT sensor CEL, not a maf sensor CEL.
Then you get to learn about HDFX and cam-angle pairs along with locking them out and doing WOT pulls, which is ridiculously time consuming.
Tl;dr- As is stated in the tuning guide and logging parameters, air is 'calculated' and not 'measured'.
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