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A few notes from my testing.
I found with my car that the lower intake was doing all the cooling work and that the upper actually let air back out at high speed. I blocked the upper and my cooling improved. I believe the top grill is for idling with the A/C on which I never do. YMMV
If you want maximum cooling then you target temp should be a degree or 2 above your thermostat temp. The thermostat opens and closes to maintain proper engine temp.
If you want to control your engine temps with air only and no thermostat ( this will increase engine warm up time) remember that you need to keep the same restriction that an open thermostat creates in the water flow. Cutting out the working parts and leaving the frame is one way to do this. No restriction will result in less cooling as the water flows though the radiator too quickly.
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