Stock intake MAF Scale

welaish · **Joined:** Tue Apr 29, 2014 4:48 am **Posts:** 946

Does it make any sense to have Stock MAF Scaling higher than aftermarket AEM and HKS? I am talking beyond 3 Volts.

ride5000 · **Joined:** Thu Aug 03, 2006 2:40 pm **Posts:** 1934

i'm not sure i understand this question.

you don't see maf sensor voltages above 3.0v?

welaish · **Joined:** Tue Apr 29, 2014 4:48 am **Posts:** 946

ride5000 wrote:

i'm not sure i understand this question.

you don't see maf sensor voltages above 3.0v?

AEM Intake Mass Airflow (g/s) 3-5volts

Code:

Stock Intake Mass Air Flow (g/s) 3-5 Volts

Code:

does it make sense the Stock intake takes higher values? on the MAF scaling Table for the same car?

bcheck555 · **Joined:** Thu Jan 29, 2009 3:16 pm **Posts:** 523

Are this intake diameters the same?

welaish · **Joined:** Tue Apr 29, 2014 4:48 am **Posts:** 946

bcheck555 wrote:

Are this intake diameters the same?

I guess not. my question is Stock intake will get more air inside the car than the AEM? does that make sense!

kennezer · **Posted:** Tue Nov 17, 2015 5:12 pm

It depends on the diameter of the other intake tube. The size difference makes the voltage change because more or less air will actually go past the sensor instead of around it. Its a relative answer. Smaller intake will cause the air to move at a higher rate to get the same volume through a smaller diameter, which in turn will cool the wire off more in the sensor causing you to have a higher voltage. You usually have to rescale the Maf table to have proper fueling on a new intake. So you can't really compare two different intake's maf scaling to each other because of the number of variables that effect the system. Does that help answer your question? I'm not an expert but that is what I have learned to understand about the Maf scaling and why it needs to change when you change intakes.

welaish · **Joined:** Tue Apr 29, 2014 4:48 am **Posts:** 946

kennezer wrote:

It depends on the diameter of the other intake tube. The size difference makes the voltage change because more or less air will actually go past the sensor instead of around it. Its a relative answer. Smaller intake will cause the air to move at a higher rate to get the same volume through a smaller diameter, which in turn will cool the wire off more in the sensor causing you to have a higher voltage. You usually have to rescale the Maf table to have proper fueling on a new intake. So you can't really compare two different intake's maf scaling to each other because of the number of variables that effect the system. Does that help answer your question? I'm not an expert but that is what I have learned to understand about the Maf scaling and why it needs to change when you change intakes.

Yes I got your point, thanks for the explanation. technically on the AEM I should get higher MAF Voltage correct?

detrex · **Joined:** Sat Jan 07, 2012 8:23 pm **Posts:** 47

If the AEM has a larger diameter than the stock intake, then you will actually see LOWER voltages for the AEM. Smaller diameter means faster airflow and hence a cooler wire. So even though you get more airflow with the AEM, it is moving past the wire slower, and will give you a lower voltage.

http://hyperphysics.phy-astr.gsu.edu/hbase/ppois2.html

welaish · **Joined:** Tue Apr 29, 2014 4:48 am **Posts:** 946

detrex wrote:

If the AEM has a larger diameter than the stock intake, then you will actually see LOWER voltages for the AEM. Smaller diameter means faster airflow and hence a cooler wire. So even though you get more airflow with the AEM, it is moving past the wire slower, and will give you a lower voltage.

http://hyperphysics.phy-astr.gsu.edu/hbase/ppois2.html

Perfect Thanks for explanation and the link.

welaish · **Joined:** Tue Apr 29, 2014 4:48 am **Posts:** 946

It was wall because of a bad MAF. I replaced it and I am back to my first scaling which is near stock.

RomRaider

Stock intake MAF Scale

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