I see that the EVO 7/8/9 MAF is the usual Mitsubishi Karman Vortex sensor that outputs a variable frequency signal.

The EVO 10 sensor is some sort of drop-in thingy, instead of the usual composite tube with a honeycomb.

What dies it return, electrically? Similar frequency signal, or something else (like a 0-5v logic signal) or what?

 

I pulled this from the service manual. I hope it contains the info you are looking for.

 

Hm. So they changed to a 0-5v straight voltage sensor.

I wonder why?

Thanks.

 

I believe its because Evo X is running speed density.

 

There are several reasons>
1. It is easier to manufacture a hot wire (Evo X) MAF vs. the Karman vortex MAF (Evo 8/9), so lower cost and Mitsu make more profit.
2. A hot wire MAF has more linear operating characteristics than a Karman MAF which means that low speed operation and engine idle have better fuel calibration (= lower hydrocarbon emissions) and you have a smoother driving experience.
3. The hot wire MAF has less cross sectional area, therefore less restriction to air flow into the engine, which means more potential power.

 

Not true as SD does not require a MAF signal.

 

True, I believe I misunderstood a thread about the way Evo Xs operate using the MAF and MAP sensors. Either that or it was a thread about how to convert the Evo X to Speed Density.