Thread: The AWD LSX STi
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Old 12-23-2020, 01:23 PM   #27
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Member#: 189394
Join Date: Sep 2008
Chapter/Region: Tri-State
Location: New York City/NJ
9994 Impreza LSX STi


I want to keep the trunk useable on this car for now. My idea at the moment is to cut out the spare tire well and make the trunk flat. Then mount the radiator directly underneath the trunk compartment. The airflow wouldn't be great but that would allow me to go extreme on the radiator size. Excessive coolant capacity and cooling fans will make up for lack of airflow but it's a weight penalty.

I have mocked it up a few times but no pictures, sorry. The radiator mounts horizontal with the end at the rear bumper tilted upwards, only a few degrees nothing crazy. Puller fans go on the bottom and the coolant hoses go on top, basically reverse locations compared to normal radiator. I would still need to integrate a diffuser that channels air on the bottom and pulls air away from the fans. Rear radiator setup like this works very well but is susceptible to debris damage. To put it in simple terms imagine stuffing a radiator into the space commonly used for a larger rear bumper diffuser and extending it all the way to the rear subframe

Option "B" is to use the current Subaru rally setup which would vent from the rear doors into the trunk compartment and out the trunk lid back. The radiator would be somewhere between the rear shock towers or slightly further back if a larger size is necessary.

The small block V8 has one big disadvantage compared to the Subaru EJ. It requires a lot more cooling capacity/efficiency. The EJ puts out considerably less heat and sheds heat faster.
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