I took a datalog of the stock sensor as measured by the ECU, it takes over 8 seconds for the sensor to start registering a rise in temperature even at full throttle and 1 bar of boost
Below is a graph of the data, black is the manifold air temp, orange is intake air temp, light blue throttle
& purple manifold pressure (boost). Ignore the actual values, at the time I hadn't worked out the conversion from ECU value to centigrade.
The stock sensor seems to only manage to measure the temperature of the manifold itself rather than the air flowing through it!
