Look at how Chrysler, Ford and GM designed a proper shroud.
Then look at the cookie sheet “shroud” (I use that term very loosely) you get with the electric fans.
Once you start getting your road speed up you can’t force all the air through the radiator and it becomes packed air.
Guys will argue this but I’ve seen it many times.
If air doesn’t go through the radiator it’s not cooling ****.
You NEED air flow.
You NEED coolant flow.
To that end you need the water pump to turn crank speed or faster. In the next couple of weeks I’m going to test an electric water pump verses a mechanical pump at 6% over driven verses the same mechanical pump at 20% over driven to see what the power loss on the dyno is.
Whatever it is it will not translate to the chassis because the biggest issue I will have is keeping the coolant at 160 degrees.
There isn’t an electric pump out there that I know of that is capable of doing that.