Project Gen 3 Subaru STI: Keeping it Cool with Koyo


Stock STI radiator
 The stock radiator in place.
 We used ARK Design’s versatile MFD II to take all of our temperature readings.
ARK MFD temp sensor
The ARK coolant temperature sensor holder is simple and straightforward making it easy to place a sensor anywhere in the cooling system.
Factory STI Coolant temp data
Koyo Subaru STI coolant temperature

As you can see the data shows that for normal conditions of street use on a cool day, the Koyo’s extra cooling capacity is not used as the overall coolant temp is governed by the thermostat. We were not able to use the car on the track because the car is destined to be a SEMA show booth car so the owners did not want to risk scratching it up for now.

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