TwinTurbo.NET: Nissan 300ZX forum - Dual MAF mod?
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Subject Dual MAF mod?
     
Posted by Agent X on February 23, 2023 at 2:49 PM
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Message I present this for discussion and hopefully to help me better understand how it all works. I've read other forums and discussions about tables, voltage to volume conversions, etc. I saw this device and thought- isn't this what the Selin device was doing? Granted, I don't have detailed information on how either is performing it's function in detail, but it sure seems possible to me. I did try to contact the company with some questions but have not heard back. The wiring on the device seems to be perfect for our setup. A different vehicle forum mentioned that you might have to use their MAFs that are programmed for this controller, but the more I think about it the more it doesn't make sense to me.
Doesn't the MAF handle all of the adjustments for air flow/volume/signal voltage? So what does the controller care about all of that if it's built into the function of the MAF? The controller would just combine the two signals and send it back to the ECM. Sure it doesn't have the option for "Average" like the Selin unit.
Would this be an option?
I am hoping to learn more about how the system operates one way or the other, from those with more knowledge and experience.

https://www.promracing.com/pro-m-duo-dual-mass-air-meter-module.html?hfp=2
"It is not just a simple voltage adder. This module allows you to use two meters that are appropriately calibrated for the amount of air flow that will pass through each meter. This is important, because it allows you to use two meters that will each range in voltage from 0 to 5 volts, utilizing their full resolution, and still provide the processor with a 0 to 5 volt signal!

In other words the PRO-M DUO will take the signals from two mass air flow sensors, each at full resolution, process those two 0 to 5 volt signals, and output a voltage ranging from 0 to 5 volts.

The PRO-M DUO has three individual harnesses, each exiting a central control module:
Harness (1) has four wires (12vdc, chassis ground, signal ground, and signal) and is meant to be connected to mass air sensor number one.
Harness (2) has four wires (12vdc, chassis ground, signal ground, and signal) and is meant to be connected to mass air sensor number two.
Harness (3) has four wires (12vdc, chassis ground, signal ground, and signal) and is meant to be connected to the vehicles processor, via the vehicles existing mass air sensor harness connector.

In addition, the central controller includes an adjustable potentiometer that allows the user to fine tune the output signal. The controller is potted, and therefore is suitable for mounting under the hood.

The PRO-M DUO can be ordered by itself, or as part of a package, with two Pro-M mass air flow sensors."

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Conversation between my sister and my wife (shortly before we
got married):
Wife: "You know, sometimes I think he loves that Z more than he
does me."
Sister: "He probably does, and as long as you're okay with that,
everything will be fine."

     
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