Electric water pump reduces parasitci load on the engine increasing performance and efficiency.Originally Posted by Peter-E36
It also reduces heat soke after the engine is shut down as it continues to circulate the coolant being powered off the battery.
Turbos are "spun" by exhaust gas. There is no exhaust gas when the engine is not running.Originally Posted by Peter-E36
Oil pressure is maintained long enough for impellers to spool down.