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On a bunch of track sessions, won’t the thermostat be fully open whether it is a 179 or 190? I have not tracked and logged coolant temps, but tend to doubt the radiator and fans can cool the coolant on the track enough to get it back down low enough to close the thermostat, even the 190. It seems to me that the the fan switch setpoints and track speeds and radiator airflow control the coolant temp more than the thermostat under track conditions. At best, a colder thermostat would give a little more initial reserve, which would probably be used up in one lap.
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