I was thinking perhaps an IAT Sensor Thermal Spacer would better help intake air temps since the hard plastic mouting is hard/dense enough to absorb/transfer heat to the thermistor.
Any ideas?...
Obviously the fuel and timing calibration will need to be changed.
If the management you are using can estimate charge temperature (based on load and rpm is nice) then there would be an greater advantage to having a more accurate air temp reading.
With full charge temp estimation capability, you could tune the engine to have a good air/fuel ratio with either sensor you use, but by removing the false heat you could "model" the engines true characteristics.
For what its worth, I have found that the 1.8t air temp sensor is quicker and less likely to heat soak then the earlier vw temp sensors, and it is *much better then the GM sensors that some aftermarket ECU's use.