Nick. Your intake air temps are measured at the AFM sensor. Given that Jake is running a stand alone
ECU with no AFM. His
IAT sensor should be somewhere on the charge piping to the intake manifold, or directly on the intake manifold itself.
Cars using AFM sensors need AFM values and
IAT values mesuared together in order to calculate correct air mass entering the engine. Hence the term Mass Air Flow Sensors. (MAFS.)
Once its been through the turbo it will be alot hotter.
And turbo compressor efficiency / sizing comes into it here aswell. If your using a smaller turbo, but demanding lots from it, its gonna be running in a less efficient state, and will generate more heat to compress the air, when compared to a larger turbo operating in its happy spot.