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Cooling systems on modern cars are plumbed to ensure the thermostat (and temp sensor!) are kept current with coolant temps at the head. On the NSX there are 3 bypass paths from the rear head to the thermostat chamber, one of which is a short leg solely dedicated to heating the thermostat with coolant directly from the rear head exit passage. Even doubling the stock power output, I strongly doubt you would see a 5*C temp gradient between the thermostat and the head, let alone the 40*C temp gradient that would be needed for the engine to be at risk of overheating with the thermostat closed.Besides that, "pushing the turbo" should only be done on a car at operating temps, which means the thermostat is already at least partially open. At idle from a cold start, you can put your hand on the coolant hose and feel the rapid heating up of coolant when the thermostat opens.
Cooling systems on modern cars are plumbed to ensure the thermostat (and temp sensor!) are kept current with coolant temps at the head. On the NSX there are 3 bypass paths from the rear head to the thermostat chamber, one of which is a short leg solely dedicated to heating the thermostat with coolant directly from the rear head exit passage. Even doubling the stock power output, I strongly doubt you would see a 5*C temp gradient between the thermostat and the head, let alone the 40*C temp gradient that would be needed for the engine to be at risk of overheating with the thermostat closed.
Besides that, "pushing the turbo" should only be done on a car at operating temps, which means the thermostat is already at least partially open. At idle from a cold start, you can put your hand on the coolant hose and feel the rapid heating up of coolant when the thermostat opens.
