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The engine bay is pretty sealed up, which doesn't let the hot air out.
The OEM design has the engine bay air exiting out under the car. I plan to improve on this by cutting a bigger opening in the metal skidplate, and adding rubber trip strips (like upside-down Gurney strips) to help pull more air out of the engine bay.
When going to a bigger aftermarket radiator and intercooler (which covers 90% of the grill opening), much of the stock air dams that direct air through the radiator are removed.
IMO fabricating new ducting/air dams to direct air through the radiator and intercooler will help a lot.
I also saw a BIG improvement in cooling by adding the radiator shroud, along with the bigger radiator and good fans.
Ducting for the oil cooler is probably necessary as well.
To get more air in, I have cut holes in the bumper (screens are black now), and installed a Drift Armor crash bar, which allows a lot more air in. Just these two things has lowered the engine bay temps a Lot.
Vented hood with proper vents is probably also needed for tracking.
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