Hey everyone, so I know the essential differences between a MAF setup versus a Speed Density set up. My car uses Speed Density (SD), which relies on the ECU having the VE to calculate the amount of air entering the engine. I always thought that changes to the car that affect air flow require a "re-tune" on a SD system due to the computer's inability to measure the additional airflow. In contrast, a MAF system measures the amount of air being ingested - meaning that a modification that increases this does not necessarily require a "re-tune" as the ECU can see the increase via the MAF.
However, after reading around on some other sites, it seems cars that use a MAF (specifically turbo cars), even after something a "simple" as a cold air intake, require a re-tune. What am I missing here?
Thanks in advance.