The Intake Air Temperature sensor (IAT) is a vital part of doing a proper speed density conversion. The IAT should be placed in the intake pipe far enough from the throttle plate to be BEFORE the IACV hose connection.
S13 SR20DET Install
Wiring of the IAT sensor is very straightforward when connected to the ECU EGR temperature sensor input. The polarity of the wires does not matter.
One wire of the IAT goes to the EGR temperature sensor input signal. The other wire goes to either pin 21 or 29, which are both sensor grounds.
ECU Connector
B13 SR20DE and S13 KA24DE Install
For ECUs that do not have an EGR temperature sensor input, you will need to connect the IAT to one of the NEMU ADC inputs using an external resistor as shown below.
NEMU 1 ADC Boards
NEMU 2 ADC Boards
Flip over ADC box and make sure to solder two solder pads together on the corresponding ADC input you would like to use for the IAT input.
Connect 1 wire from IAT sensor to the ADC (0-3) input pin that corresponds to the jumper you just soldered together
Connect remaining wire from IAT sensor to ADC Ground pin
Typical IAT Installation
