Most of you guys have seen that I am successfully running boost on a 7427 with a 2 BAR map. The truck is running great. I added a MAT sensor to the setup so that when the air coming in gets hot, I can rely on the sensor to pull some timing. For some reason that function is not working. The MAT itself is working, because I can log the temp. This "MAT & CTS Blend Multiplier vs. Airflow" is working as well. I have the MAT sensor flag set.
I have the MAT Bias set to 9.8
As a test I populated the entire "MAT Spark Advance Compensation vs. MAP vs. Temperature" table with -10 degrees, and drove the truck. My timing showed the same as what is in my Main Spark tables. the ECM never pulled any timing base on MAT. I am trying to figure out whats going on. I did find a flag that the CPI bins have set that the TBI does not, that has to do with the MAT, I tried both ways, didn't make a difference. Its at 442F "LD SELECT, ( 0 = VACUUM 1 = RPM) MAT". Could it be something with the Negative or Positive multipliers?
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