Building A Custom Fan Shroud - Steel Vs Aluminum
You said this a MPFI engine. I don't remember which ECM you said you are going to use other than one from a similar vehicle that the engine came from. With that said, the ECM will probably expect to see the engine operate with a 195* F thermostat. That means the fan should come on at 210* F and off at approximately 197* F, slightly higher that the thermostat temperature to prevent short cycling the fan. The OEM fan set point is probably higher but can easily be reset. The ECM should be fully capable of controlling the fan without the need of a Summit controller. Check your ECM wiring diagram for the correct pin to wire to fan relay.
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custom fan shroud with electric Fan
The air speed across the radiator is quite a bit less than you might think unless you've done a lot of work on post-radiator ducting. I've seen fans (and shroud) make a significant difference at 75 mph. Just for fun, put a strong fan in front of your car and then try to spray water into the grille from a few feet away. Most of the air goes around the car. You need those fans.
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If you run without a shroud, then your fans will either pull air from around the edge of the fan (doing nobody any good whatsoever) or they'll only pull through the part of the core directly in front of the fan. That means about 50% of your core (or less) will not be seeing airflow from the fans.
My BMW has a shrouded pusher on the AC condenser, but it's got bypass flaps on it as well so they can open up if there's more pressure on the wrong side of the shroud. We do the same on our puller shrouds.
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