How can you get the info?

I am reflashing a Lancer ralliart with evoscan and ecuedit make datalog but the tables of tuning on ecuflash are on gm/s or units, but the datalog make the info on Hz data, how can I do there?

It sounds like you're simply scanning the wrong PID. The raw output from the airflow meter is a frequency measured in Hz and then the ECU uses a calibration table to convert into grams/sec. You should be able to scan another PID that will give you mass airflow directly.