2015 Porsche Macan S: Carefully Managed Airflow
November 11, 2014
Digging around under the hood of our 2015 Porsche Macan S reveals some interesting and precise engineering. Even casual observation shows critical thought and heavy expenditure in an area that sometimes isn't given such effort. Here, it's Porsche's careful management of every bit of air flowing into the Macan's nose.
Intake air first passes through the grille (red arrows, top photo). Some of the air that bypasses the Macan's active grille shutters is rerouted upward through a second grille under the hood (red shaded area top photo). It then makes its way into the hollow hood (red arrows and shaded area, second photo) where it passes relatively unobstructed through a large space before being shoved downward through two holes in the bottom of the hood (pink arrows and shaded area, second photo) and into the airboxes on either side of the engine (pink shaded area, top photo).
After being filtered in the airboxes, intake air is ducted past the frame rails to the turbochargers where it's compressed and sent on the other side of the frame rails into the intercoolers (blue shaded area, bottom photo). After passing through the intercoolers, which are cooled by fresh air through the bumper (blue arrows, top photo), the intake plumbing merges (green shaded area, top photo) just before air enters the engine.
It's a convoluted path and there's a high volume of intake air being pushed around, yet this turbo engine isn't the slightest bit laggy. Impressive and expensive, no doubt.
Josh Jacquot, Senior Editor