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The NSX like most road cars will operate well above 172 deg F (78 deg F) - more around 185-190 deg F regulated by the factory thermostat. This is slightly less than optimal for performance, but well suited for reducing emissions. Like most road cars, the stock thermostat uses less radiator capacity than what is available under most conditions (meaning that the radiator can extract more heat than the engine car put in unencumbered by the thermostat). By allowing the thermostat to open fully at a lower temperature, more capacity of the radiator can be used to reduce coolant temperature resulting in lower cylinder temperatures.This is of course assuming there is radiator overhead capacity which may be reduced by thermal input from ambient temperatures or other inputs like a water jacket turbocharger. Verifying radiator capacity would be easy by monitoring coolant temperature, then changing or eliminating the thermostat. If there is no change in coolant temperature, you need more radiator capacity.
The NSX like most road cars will operate well above 172 deg F (78 deg F) - more around 185-190 deg F regulated by the factory thermostat. This is slightly less than optimal for performance, but well suited for reducing emissions. Like most road cars, the stock thermostat uses less radiator capacity than what is available under most conditions (meaning that the radiator can extract more heat than the engine car put in unencumbered by the thermostat). By allowing the thermostat to open fully at a lower temperature, more capacity of the radiator can be used to reduce coolant temperature resulting in lower cylinder temperatures.
This is of course assuming there is radiator overhead capacity which may be reduced by thermal input from ambient temperatures or other inputs like a water jacket turbocharger. Verifying radiator capacity would be easy by monitoring coolant temperature, then changing or eliminating the thermostat. If there is no change in coolant temperature, you need more radiator capacity.
