So to sum up if the details are wrong this is a bad mod?
Probably true about any mod.
The Davies Craig video claims they have spent years engineering their electric water pump to work well in a automotive application.
They also explain how they control the pump, at low temps the pump runs at a low duty cycle to just barely circulate the water, as the temps increase to the set point the ON/OFF duty cycle is increased. This means that the pump only runs as hard as it needs to in order to control the temp.
This level of electronics is not too hard in theory.
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