Thread: Z32 maf voltage

I'm not sure how accurate that table is. I was around 4.28V making about 315whp...I think whatever calculations were used should be moved up on scale to fit with what people were seeing here.

-G

I think a lot of the variation has a lot to do with how the MAF sensors are installed in each individual set-up. I suspect that myN62 is over-reporting voltage... not sure if it’s a bad sensor, or if it’s the proximity and orientation of the MAF to the turbo inlet.
-dave

anyone have any updated numbers? I find this topic pretty cool and probably one of the best ways to estimate power increase without a dyno.

Correct me if I'm wrong, but since we're talking about mass of air entering the engine vs. Whp output I'd expect an unreliable variation of #'s seen with different setups. Wouldn't the whp be dependent on how efficiently the engine setup is turning the charge into mechanical power against frictional losses? For example id expect a higher whp at a lower maf voltage for a setup with methanol or e85, aftermarket pulleys, than a setup running petrol and stock pulleys. Also timing would play a big factor too. I think Unisa's table is a good example of an ideal situation.

Again feel free to correct me if I'm wrong.

as you mentioned there is a lot of variations between setups, but in general the voltgae can be used as rough estimator. air + fuel = power so if you know how much air and fuel you are consuming (MAF and injecotr pulse width) and a/f ratio, you can make a general estimate on HP, making some assumptions on parasitic losses and such.
-dave

MAF HP is theoretical potential HP and doesn't represent actual engine HP. It is used to scale the MAF sensor voltage to mass flow rate between different MAF sensors.

In order to get a good idea of the hp potential of a given maf, you have to know the MAF Voltage to CFM or Pound/ Minute or Kilo Gram/ hour = Potential HP.

The problem we have, the Nissan's VQ number does not represent air mass (lb/min or kg/hr). The whole VQ table is a percentage table. The numbers represent a percentage curve.

Some will argue the VQ table does represent air mass. But I will say then why does all different Nissan Mafs and their VQ tables end with 65535? If the VQ #s represent airmass then that would mean all the Nissan Mafs would read the same peak air amount. Intuitively, we all know they don't.

When it comes to understanding the MAF values, we are behind the Fords,GMs,Suburus,Audi and newer Hondas. They all go by kgr/hr or lbs/min. We can thank Nissan for that with the VQ numbers, which is only a very indirect representation of actual airflow. The VQ table is a flow curve but the numbers does not represent an actual air mass unit. Hence the reason why it’s a big headache to some when switching mafs.

If we want to know the true hp potential of the N62 maf or any other Nissan mafs, I suggest we send in some of the most popular Nissan mafs to be flow tested by the aftermarket maf tuners. They can give us the maf transfer table in cfm which can be converted to lb/min or kilogram/hr to ultimately potential hp. No more guessing the true hp potential of the maf.

Conversion:

Lbs/min = CFM x .069

Kg/hr = CFM x 2.03

1 Horse power = 1.45 to 1.6 CFM

good topic ....useful info ...