Quote:
Originally Posted by EDFHOBBIES
Thanks for the info Ted, it is complicated.
But from your explanation both the Zl1 and SS read the IAT 1 from the MAF This is what gets me baffled I would think both should read the same air going into the motor should be more similar temps.
IAT 2 makes perfect sense to read differently a better blower more efficient brick I have a slightly larger reservoir the Tmap is located in a better position on the 2650.
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For stock ZL1 the physical sensors are (I have manually pulled IAT1 and TMAP sensors and confirmed the mapping):
- IAT1 = MAF temp sensor
- IAT2 = N/A (value is IAT1+math)
- MAT = TMAP (Temperature and MAP) in rear of SC
In HP Tuners the mapping is confusing:
- IAT Sensor Cal = MAF temp sensor
- IAT 2 Sensor Cal = TMAP temp sensor (there is no MAT table, they should really fix this to remove the confusion)
MAT = PID 2128 (corrected)
My TVS2300 came with a harness to re-locate the T part of the TMAP into Cylinder #2 runner of the lower body of the blower. The TMAP sensor is susceptible to heat soak in the rear position. If MAT values are incorrect (high) you can pull timing unnecessarily via "IAT Adv" parameter per IAT table values (base/mult).
See picture below of the stock 4 bar TMAP sensor, you can see the thermal sensor in orange protruding out. You will also notice it is a 4 wire device as compared to a standard 3 wire MAP sensor, 4th wire is for temp out.