An idea, put a brake duct scoop under the bumper or otherwise in the air dam just under the rad support. Run a duct tube from this out past the cross member. Under the turbo splice in Y piece to the duct work described previously and add a short piece of duct to this that ends up near the turbo/exhaust manifold.
I think it will work under speed in that cool/cold fresh outside air will enter the brake duct opening and then rush past the Y fitting. The air rushing past the Y piece will have a venturi effect and pull hot air from duct opening placed near the turbo. The hot air pulled from using this setup will be replaced with cool/cold fresh out side air thats coming in from the hood scoop.
I suspect that even though hood scoop is under the boundary layer and theres no ram air effect it does allow air to reach the exhaust manifold area. But I wonder if the air in this spot moves much because of air is not rammed in and other things in the engine compartment here are not setup or intended to direct the heated up air out.
You could also just run a duct from up by the turbo down past the cross member and cut the end like / instead of this -. I think this will work as well as air getting under the car at speed will pull the hot air through the duct, again because of the venturi effect.
Another option is to use or include one of those marine vent fans that the road racers use into the duct work so that at low speeds or stop and go traffic theres some airflow. I would think you could wire a fan up to a turbo timer to help with cool down and prevent coaking in the turbo.
With the right setup I think a simple controller could be made so that the fan is controlled by a simple temp sensor located near the turbo. The online magazine Autospeed most likely has a simple device that could do this and be put together on the cheap.
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