gt500 MAF/blow thru setup

[JeremyH]

A stock MAF sensor on a 3.5 pipe (about 83mm of ID) will need about 50Kg/hr of air to reach 5V, an HPX sensor on the same config will need to over 120Kg/hr of air to reach that same voltage. THIS IS THE MAIN ADVANTAGE OF THE HPX, THE RANGE.

Now, the stock unit, if you keep adding airflow it will stop metering around 5.5-6V when the HPX will continue to measure (something I have not tested myself, I always try to plan the piping mods so we won't peg the sensor or need an extender)

Hope this helps you understand the differences between the meters.

Great explanation, thanks

 

[1lowtoy]

This is copied from Wikipedia. (much quicker than me typing something out) "
A hot wire mass airflow sensor determines the mass of air flowing into the engine’s air intake system. The theory of operation of the hot wire mass airflow sensor is similar to that of the hot wire anemometer (which determines air velocity). The Buick motor division (GM) was the first car company to use the hot wire sensor.[citation needed] This is achieved by heating a wire with an electric current that is suspended in the engine’s air stream, like a toaster wire. The wire's electrical resistance increases as the wire’s temperature increases, which limits electrical current flowing through the circuit. When air flows past the wire, the wire cools, decreasing its resistance, which in turn allows more current to flow through the circuit. As more current flows, the wire’s temperature increases until the resistance reaches equilibrium again. The amount of current required to maintain the wire’s temperature is directly proportional to the mass of air flowing past the wire. The integrated electronic circuit converts the measurement of current into a voltage signal which is sent to the ECU.
If air density increases due to pressure increase or temperature drop, but the air volume remains constant, the denser air will remove more heat from the wire indicating a higher mass airflow. Unlike the vane meter's paddle sensing element, the hot wire responds directly to air density. This sensor's capabilities are well suited to support the gasoline combustion process which fundamentally responds to air mass, not air volume."

The internal calibration of the sensor is what controls how much voltage is outputed in relivation to the air mass. Like Lito stated, the factory sensors are clipped at roughly 5.5 to 6 volts. In a factory application there is no need to a sensor to output any higher than that seeing as how the ecu can't use anything higher than 5 volts any way. The interal clip has been removed from the HPX sensors. Like Lito also stated, the best thing to do is use the appropriate sensor in the appropriate size tube. An extender isn't a bad idea to gain a little bit of head room over changing a whole setup out if you are just going for a little more power. Sorry for the late responce, I had a lot going on today.

 

[JeremyH]

Its alright had a but of crazy day myself but everything got done, so for what im looking for the mafia should fit bill for 500-600hp.

 

[lito]

Its alright had a but of crazy day myself but everything got done, so for what im looking for the mafia should fit bill for 500-600hp.

Well it depends, MSRP against MSRP you are looking for about 80$ more on the HPX but if you are going to build some custom blow thru config or use it on something like a procharger kit there is one pro on the HPX, with the extended range you may get a little more stable signal out of it because of some filtering side effect of the wider range and it is important because blow thru configs are quite noisier than draw thru. And you are already covered for the future.

If you already have the MAFia there is absolutely no reason to swap if you don't get it to peg, if you have not bought anything yet I think the new sensor is a more smarter and proper move.

 

[JeremyH]

I am going turbo and will be going blow through on 3inch pipe. Yeah i already have the mafia and was going to use it on the stock maf.

 

[1lowtoy]

The HPX would work great for you.

 

[JeremyH]

Im sure it would work also but i will stick with the mafia since i already have it. And if i run into any problems or turbulence issues i will conisder the hpx.