i relocated my IAT sensor to the pre-airbox duct (aircon compressor side). it's mounted about 2 inches from the mouth of the duct. My IATs and fluctuations are very similar to wstar's findings.
However i do notice this sensor responds very fast and as soon as i come to a stop, IAT starts rising quite quickly. Once moving again, it drops fairly quick and i've gotten it to within 1*c of the onboard ambient sensor temperature reading.
Car is stock with heat shielding tape wrapped stock airboxes & airbox outlet pipes wrapped in heat resistant mitt material. Filters are stock Nissan ones.
I'm attributing the standstill IAT climb to radiant heat from the radiator. Stick your hand thru the front grille when she's full warmed up and u can feel the heat radiating without sticking your hand in too far.
This is probably why motoIQ quoted a higher dyno output with the front fascia removed.
With the factory sensor, the IAT climbed slower when standing still and dropped slower so i'd say it's quite slow to respond or that may be due to distance from the intake mouth. When testing with hairdryer aimed into the airbox (filter holder removed, it seemed to respond quite quickly though.
NB: sensor is one from a Mazda3. @ 20*c air, it has the same resistance as the factory IAT sensor. I have it mounted in this duct because someone on the forum said the ecu takes IAT readings from the (US) driver's side bank. This is incorrect. According to the FSM and my own hair dryer test with scanguage to monitor, the ecu does indeed take IAT readings from bank 1. ie the side closest to the alternator. Either way, the coolant hose on bank 1's side seems to be radiating a lot of heat while bank 2's side seems cooler without this hose nearby.
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