The MAF not only is faster, but has a larger, finer resolution operating window but also handles weather issues and its output is much faster then if only relying on what SD does using the MAP sensor.

Since VE is used for startup and if using a custom CAM that has lost low end vaccum then that is where VE needs a tweak but as the results show even with many engine changes and increased cylinder volume the PCM still did just fine adjusting with what other sensors reported.

SD would be considered IF a supercharger or turbo is used with higher boost levels where the airmass is way beyond the bounds of the PCM tables such as timing tables that need to know the grms per cylinder to know how much timing to use.

Incorrect VE changes can cause surging since its other use is on decel or anytime the PCM would not used MAF either if there is no airflow such as startup or when butterfly of TB is closing.

VE tuning is a lot of work, you cannot go for a couple mile drive and do PCM scanner recording because to do this right you have to have good averages and hit most of all those points in the VE table matrix. Hitting matrix cell just a few times and the average value seen with scanner would not be correct.

Even once VE tuning is done as seen in results when weather was about the same but drive style a bit different the total averages reported were different so VE tuning is a moving target and simple weather changes can require constant VE table changes required so in the end let the MAF do its job and the end results using MAF are just fine.

I went through this test effort because cyberspace has allowed this myth that a good tune is only via VE is so out of hand that many cars I tune lately that were tuned before by some hacker using VE the engines run like crap and thus there needs to be information for MAF based to equal the playing field on how to tune.

My gut feeling is this got out of hand by

1. those who were tuning OBD-I cars, had no experience with a MAF and thus just decide to tune OBD-II like OBD-I

2. People outside of the USA who careless about American EPA smog rules and engine functions for them.

3. Sly marketing hype by tuner product vendors ( 2 of them sell VE tuning methods, 4 others do not) claiming using their can do VE and competing tuner products cannot ( which is BS)

4. Hackers who call themselves pro tuners claiming have them do your tune becuase they do VE tuning and competing tuners do not

5. Guy who just tuned his own car and now claims to be a cyberspace god and knows it all.