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MAF sensor placement and effects on tune

Practical Reflash Tuning

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Flash tuning Mazdaspeed 3 with COBB accesstuner.

Switching to the COBB SF intake, which is simply a better flowing, similar diameter intake compared to OEM, I am noticing some phenomena that I am struggling to tune around.

I believe this is caused by the MAF placement.

1. I seem to be chasing my tail trying to set the MAF calibration, I have 2 consecutive RPM sweeps showing different trims. 1 sweep may show -3% and the next +3 at the same MAF V position. The variables that are changing are RPM, gear and engine load - Should these influence fuel trims?

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2. When under low load cruising (throttle pretty much closed), It seems like the car is reporting between rich/lean condition, and the system is responding appropriately by pulling or adding fuel, up to the 25% limit. See the yellow line(AFR), in the following picture. The system will swing between 13-17AFR. This is felt in the cabin (unsteady due to extreme lean/rich miss).

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From my research, I believe this has to do with the MAF sensor placement on the intake:

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With an air straightener that I normally don't see:

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I want to believe that COBB is a reputable company and they know what they are selling, but this design with the MAF sensor right at the filter goes against what I know and research. It is enough to function, but could it be the reason behind what I am seeing?

Thoughts?? Opinions??

Attached Files

Hello im with you on this one i would be adding some pipe to the air cleaner area too prove a point

regards Ross

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