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Originally Posted by CNHSS1
dont underestimate the extra heat that turbocharging will put into the engine water system either (through producing more power), you may need to look at the engine rad size or core thickness. im assuming the Gt3071 you have has a water cooled core? if so it may be better to not use the water cooling for the core but leave it open to the air. the water jacket is really there to save the bearings from lazy drivers who turn the motor off hot and carbonise the oil, but given that the engine will be warmed up and shut down properly, itll help to keep extra heat out of the engine rad system by not hooking the core up in the first place.
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The downside of not running the water through the turbo's cooling jacket is that then you would have to increase the volume of oil being flowed through the bearing core to prevent it from being over heated, this then results in the oil pump needing to be upgraded to maintain adequate flow and pressure, as well as extra cooling for the oil system.