Hi All,

Has anyone thought through how to wire the stock RX8 coolant
temp sensor to a Dynon GP Input? Any info on specifics of
the sensor is also appreciated.

Thanks in advance,
--Kenny A.

Do you have the instructions for the Dynon Kenny.
You need to know what kind of sensor it requires.
You also need a calibration curve for that sensor.
Resistance verses temperature.

The ECT Engine Coolant Sensor in the RX8 is the thermistor
type.

"Thermistors are thermally sensitive resistors whose prime
function is to exhibit a large, predictable and precise change
in electrical resistance when subjected to a corresponding
change in body temperature.  Negative Temperature Coefficient
(NTC) thermistors exhibit a decrease in electrical resistance
when subjected to an increase in body temperature and Positive
Temperature Coefficient (PTC) thermistors exhibit an increase in
electrical resistance when subjected to an increase in body
temperature.  Because of their very predictable characteristics
and their excellent long term stability, thermistors are
generally accepted to be the most advantageous sensor for many
applications."

I am not sure if the RX8 is a PTC or NTC type. Use an ohm
meter and place it in boiling water. You can then calibrate it
and compare the calibration curve with the Dynon type.

Paul Lamar


Automotive ECT's are negative. The lower the temp, the higher the resistance.
This allows less current to flow and the ECU "see's" higher voltage. This
richens the mixture like a choke. As the coolant warms, the resistance gets
less. The ECU see's less voltage, thus less fuel. On the ECU board there are
resistors just before the terminal to the sensor. There is an internal take
off for it to sample the voltage, between this resistor and the sensor.
Test to your heart's content though.

Dale Davies