I am playing around with running No thermostat. I am running a restrictor. Friend of mine removed his thermostat with no restrictor and the coolant temps acted stupid. Got really hot at idle, 220. He needed to slow the coolant down going through the radiator. He installed his 170 thermostat back in and engine temp ran normal. So, you need to run a restrictor if you remove the thermostat. He was monitoring with the Ecutek app. My car runs the same temps as if I was running the 170 deg thermostat with the restrictor.
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