E46Fanatics - View Single Post - [Cooling System Upgrade] 1-BAR Radiator Cap
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Old 10-04-2012, 01:42 PM   #10
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Join Date: Nov 2011
Location: texas
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My Ride: 2013 335is 6mt
Originally Posted by cvx5832 View Post
Electric water pumps. They never have to move at engine speed. Reduced speed equals lower required pressure to keep bubbles at bay at the impeller.

There's more to it though. The n54 electric water pump is variable speed and runs after the engine is shut off.

Point was the n54 cooling system operates a more traditional 1 bar cooling system.
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