GM MAF electrical characteristics?

[We're on Boost]

Have been wondering lately, some things about the GM MAF, like, how much current (amps) does it draw from the "12volt" input line? Is it preferred for the 12 volt input to be actually regulated to 12 volts? Or is it fine for it to be just the 13.8 or whatever voltage your alternator is putting out at the moment?

Somewhere, I can't find it now, ECMtuning posted a pic of their GM MAF cable showing a separate ground wire, saying to ground that to the chassis, instead of using the ground wire in the harness that goes to the stock MAS, because using the ground wire in the stock harness could cause a ground offset voltage which would affect other sensors. I'm wondering if that means the GM MAF uses more current than the stock MAS? If the GM MAF uses a lot of current compared to the stock MAS, then maybe it's not so good to power it with the stock 12 volt line in the MAS harness? About all I know about this stock 12 volt line is that it is apparently not regulated. I measured 13.3 volts on mine today with the car on fast idle and the voltage right on the battery terminals at 14.25 volts. With the car off but ignition on, I measured 11.75 volts on the 12v wire, and 12.12 volts at the battery. Anyway, I have no idea what the safe current capacity of that line is, or what the current desire is of the GM MAF under different conditions.

 

[We're on Boost]

Ok, how 'bout the output of the GM MAF?
A person at Coolingmist told me that the GM MAF puts out variable frequency pulses (like a Mitsu MAF), therefore you can't run it to their VC2 controller which expects a 0 to 5 volt dc voltage. Is this right? I sort of thought the GM MAF put out a variable dc voltage.

 

[Ceddy]

The GM MAFs change frequency according to airflow, just like the Mitsu Karmen MAFs.

The Mitsu MAFs max out around 3000 Hz, but the GM go much higher around 30,000 Hz. Thats why you need a translator or cable, our ecus can't handle x10 higher frequency as input.


Ford, Subaru, and EvoX MAFs output a variable voltage according to airflow.

 

[We're on Boost]

Super, that is good to know.
In fact, the up to 30,000 hz is really interesting. I've been looking at the coolingmist Smart Injection Controller for water injection. It has 2 inputs that can take a frequency signal from a MAF, so you can use that as one axis on your injection map. Anyway, they say the range of those inputs is 2 hz to 20,000 hz. Might not be enough! I guess then I might need to use the hz signal after it has been converted to mitsu hz, that would be easy enough.
But, do you have any idea, when a 3" GM MAF is putting out 20,000 hz, what amount of airflow would that be, approx?