Who is using the 987 MAF Holder / Tube?

[1thenaton1]

you can't increase the diameter of the maf housing without adjusting fueling tables. MAF calculates the volume of air ingested using the velocity of the air past the sensor, which of course is a function of the size of the tube it's flowing through. The codes you are getting are generated in regular driving where the O2 sensors read lean/rich. At wide open throttle where the ECU is running on set tables (and not off of O2 sensor feedback), you will be running lean (increased airflow not accounted for because of incorrect maf housing size). Lean is mean, until it's not. Without monitoring this with a wideband O2 and updating to a custom tune you are asking for trouble, especially on track. What is you crazy

[maytag]

Originally Posted by 1thenaton1

you can't increase the diameter of the maf housing without adjusting fueling tables. MAF calculates the volume of air ingested using the velocity of the air past the sensor, which of course is a function of the size of the tube it's flowing through. The codes you are getting are generated in regular driving where the O2 sensors read lean/rich. At wide open throttle where the ECU is running on set tables (and not off of O2 sensor feedback), you will be running lean (increased airflow not accounted for because of incorrect maf housing size). Lean is mean, until it's not. Without monitoring this with a wideband O2 and updating to a custom tune you are asking for trouble, especially on track. What is you crazy

All makes perfect sense. I wasnt aware that at full throttle it was a closed-loop, either. Good stuff.

So, do YOU know anyone local who'd flash me to a 996 ROW?

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