FAQ



An Exhaust Gas Temperature (EGT) thermocouple sensor generates a voltage based on temperature changes. However, this relationship is not linear; it follows a curved pattern. Consequently, the voltage output cannot be directly used to determine the temperature. To get an accurate reading, you will need a special instrument or device to read the voltage output from the (EGT) thermocouple sensor. The output of the thermocouple sensor is a very small voltage, typically in the millivolt range, which is proportional to the temperature being measured. Standard voltmeters or multimeters may not be sensitive enough to accurately measure such low voltages.

To read the output of the EGT thermocouple accurately, you will need to an instrument that is designed to work specifically with thermocouples and can provide accurate temperature readings based on the voltage output from the sensor. These instruments are equipped with the necessary calibration and conversion capabilities to interpret the thermocouple's voltage and display the corresponding temperature value.

There are several thermocouple instruments that you can use to monitor EGT and other critical temperatures in your race car. Here are some examples:

  1. Handheld Thermocouple Reader: These portable devices are compact and easy to use. They come with a display that shows the temperature directly in real-time. Handheld thermocouple readers are convenient for on-the-spot temperature monitoring during pit stops or diagnostics.

  2. Data Logger with Thermocouple Inputs: Data loggers are more advanced devices that can record and store temperature data over time. They often have multiple thermocouple inputs, allowing you to monitor various temperatures simultaneously. You can analyze the data later to make informed decisions about engine performance and tuning.

  3. Race Car Dash Display: Some race car dash displays come with built-in thermocouple inputs, enabling you to monitor temperatures directly on your car's dashboard. This provides real-time data at a glance, making it easier to keep an eye on engine health during races.

  4. Engine Management Systems (EMS): Sophisticated EMS systems designed for racing often include thermocouple inputs. These systems provide comprehensive engine monitoring and tuning capabilities, allowing you to optimize performance and protect against overheating or other issues.

  5. Data Acquisition Systems: These systems are commonly used in professional racing and allow for extensive data collection, including thermocouple data. They offer advanced analysis and tuning options to maximize the car's performance.

When choosing a thermocouple instrument for your race car, consider factors like the number of thermocouple inputs required, data storage capacity, display options, and compatibility with your car's existing electronics and systems. It's essential to ensure that the instrument can withstand the harsh environment and vibrations typically experienced in racing.

Our EGT probes are standard Type K thermocouples. A 2-wire, non-powered device.  Not thermistor or RTD. We can build EGT probes using thermistor or RTD elements upon customer special request

The EGT probes do not come with a calibration sheet or chart.  They are a standard Type K thermocouple device whose output follows the ITS-90 Type K thermocouple linearization curve. Most modern day instrumentation can read a Type K thermocouple directly.  In some cases, thermocouple amplifiers are required to interface between the thermocouple & the particular measuring instrument.  But if you absolutely must have a calibration sheet then we can send the probe out to an independent agency who will issue us a 5 or 10 point Calibration Test Report that includes data.  There is an additional charge for this service.

In order to extend an EGT Probe or CHT sensor cable, we recommend using our thermocouple extension wire and thermocouple connectors. The wire and connectors are made from specific materials that will ensure that you are getting the most accurate temperature reading possible.

While it is possible to use copper wire to extend the cable, this can have a negative effect on the accuracy of the temperature reading.

You can find all the wires and connectors you need on our website at the following links:

Extension wire

Male Connector

Female Connector

For additional technical questions, contact us now to speak to an experienced application engineer!


Shortening the cable length of an EGT probe by a few feet is generally unlikely to have a significant impact on its operation or accuracy. If you have concerns about your specific application, our experienced application engineers are standing by to help you find a solution. Contact us now!

Reducing the length of the EGT probe's wire by a few feet typically will not affect the operation or accuracy of the probe.

The maximum length you can extend the EGT probe's cable is about 50 feet.

All of our EGT probes output wires are isolated (ungrounded) from the probe's outer sheath

The most likely explanation for this issue is that the sensor's wires may be connected backwards. Please confirm that the sensor's wiring to the meter input terminals is:
YELLOW = + (positive)
RED = - (negative)

For additional technical questions, contact us now to speak to an experienced application engineer!

One EGT probe placed in the collector will measure the leanest (hottest) running cylinder. For a quick test of which one that is you can do the following:
With a running engine, take an EGT probe & touch it to the outside of each pipe. Make sure that you are measuring at the same distance from the header pipe flange or manifold runner. Write down the temperature of each pipe. This will tell you which cylinder is running hottest.

Our EGT probes are designated “special limits of error” for +/- 2 degrees F (or +/- 0.4% range) accuracy tolerance.