Food for thought.
Factory pumps are designed for maximum flow around 2500 RPM's.
I Drag race my Stang and cut blades from the impeller, getting the cool I need. At a higher RPM a stock pump cavitates the water reducing flow. Lost yet?
A clutch fan is working about the same as its counter part at 2500 RPM's. So at the high revs the fan really becomes less a part of cooling as your pump spins the same with either fan.
At highway speeds where are your RPM's at? Above 2500? If so,I would go with a performance pump that moves a higher volume at higher revs.
Water wetter does work.
I would stay with the clutch and look into the pump. A larger radiator is always good.
My head hurts now.
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