Thread: Aero question

I have an aerodynamics question towards my P10 circuit car build. I am mounting the radiator in the rear of the vehicle due to space restrictions in the engine bay and for better weight distribution. I intend to draw air in by fabricated scoops in the rear door skins, through ducts to the radiator, but im unsure where the best place would be to duct the hot air back out.
My initial idea was to open up the area in the boot lid between the lights. But i was also wondering about ducting it out under the car.I am going to fabricate an under body tray and a defuser at the rear underside to tidy up the airflow under the car, and was wondering if ducting it out under here may encourage a scavenging effect to help draw air through, reducing the size of the ducts i will need in the doors. Thoughts or pictures anyone has seen of a good rear mount setup?

I have looked at the pictures of the Team Orange drift Subaru's setups, and they duct out through the rear of the boot but i doubt they are looking for a top speed setup.

It depends on what you want from the aero... Down force? Drag reduction? Best cooling?

Most people don't waste their time with rear mount cooler. It is alot of work, added weight, negligible benefit.

I would personally figure out a way to keep it in the front with proper front ducting for your intended goal.

If you are running a good front air dam, the air under the car should be lower pressure than above the car. This may pull the air through the cooler. At the same time, with proper duct work the air through the cooler will be restricted so probably little bad impact on aero.

This article may help in alternate radiator mounting ideas / airflow:

Project Frankenmiata - The Ultimate Miata Coolant Reroute > MotoIQ