This GM-style closed-element sensor is typically used as a air temperature sensor, providing accurate readings in a variety of automotive applications. The open element design ensures long-lasting durability, making it ideal for harsh environments like those found in engine compartments.
Compatible with a wide range of standalone ECUs, including MegaSquirt, MS3Pro, MSPNP, and more, it is perfect for measuring temperatures in both coolant and air intake systems. This sensor uses the common GM calibration, making integration easy with most tuning software.
Features:
Sensor Usage: typically used for air such as ambient air, manifold air, etc
Open Element Design: Provides durability and protection in harsh environments
Universal Fit: Compatible with most aftermarket engine management systems, including MegaSquirt and MS3Pro
Specifications:
Resistance Range: GM-style thermistor (300 ohms at 210°F, 3400 ohms at 70°F)
Thread Size: 3/8″ NPT
Wiring: Standard 2-wire connection (signal and ground)
Wiring:
Pin A: Sensor Output Signal to ECU
Pin B: Sensor Ground
IMPORTANT NOTE: The pins for this connector are pull-to-seat! This means you cannot push the pins into the connector from the back.
Calibration:
If you need to calibrate your MS for this sensor, here’s the calibration data we use for them for a three point curve.
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What size hole do I need to drill to install this sensor?
The hole should be tapped for 3/8″ NPT. Your tap will come with instructions for the preferred drill size, which is likely to be 9/16″.
What is its resistance vs temperature curve?
If you are connecting this to a device that supports 3 point calibration (all MegaSquirt units do), use these numbers if your device does not have a standard GM temperature sensor calibration curve.
7000 ohms at 48 degrees F
1930 ohms at 87 degrees F
560 ohms at 146 degrees F
I am using it with a device that requires a voltage vs temperature curve. What data do I enter?
This sensor outputs resistance, not voltage. You will need additional, external circuitry to convert its output into a voltage, and the voltage will depend on the design of the external circuit.
Can I buy the connector separately?
Yes. You can order a connector here: GM IAT sensor pigtail connector. This is a somewhat different style connector from the one we ship with the sensor, but will connect to the sensor without any problem.
Where exactly should I install this on my engine?
We do not recommend threading it into the intake manifold except for supercharged engines where the supercharger attaches directly to the manifold. For all other applications, we recommend installing this sensor in the part of the intake system directly upstream of the throttle body. The reason is that the intake manifold often transfers heat to the sensor by conduction at a faster rate than it transfers heat to the incoming air. While there are ECU settings to compensate for this, mounting the sensor where it does not absorb so much heat will often make tuning easier.
Questions & Answers
what is the part number other than iatwpiggy?
0 votes
Qwhat is the part number other than iatwpiggy?
Asked by perry
A
This is GM part number 25036751.
What is the thread size, pitch and length?
0 votes
QWhat is the thread size, pitch and length?
Asked by Mahmoud Gasser
A
This is a 3/8" NPT (tapered) pipe thread, about 1/2" long.
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