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And that is exactly the point of putting in a lowtemp thermostat.

The thermostat is constantly opening and closing dependant on the cooling capacity needed to keep good operating temp, this again dependant on the outside airtemp/radiator cooling ALL the time the engine is running, also when "warm".

The temp addition of a watercooled turbo to the OE cooling system when the turbo is pushed for a short time can be soo great that it may spike way too high before the OE temp reacts, the cooling system "overflows" with too quick temp rise. A lowtemp thermostat opens earlier, thus flattening out the temp spike so it cannot get to a dangerous level


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