Porsche GT2RS Flow Test

I was contacted by a Porsche owner who was interested in seeing how the Porsche GT2RS intercooler would flow.

The core is 14″ x 9″ and 3.5″ deep with 2.25″ ID inlets and outlets.  The core arrived with packing over the fins that still allowed me to flow test the core without removing the protection from the fins, so I left the covers in place and didn’t take any photographs of the core.

Since I didn’t take this set out of the covering, here’s an image link to a blog post with a number of additional photos.  This photo is also from the blog article.

Porsche GT2RS Intercoolers
Porsche GT2RS Intercoolers – Image from 911car.blogspot.com


The Results

218 CFM @ 28″ H2O – Center draw

225 CFM @ 28″ H2O – Side draw

By center draw and side draw I am referring to the endtank which the atmospheric air is being sucked in via.  The center draw end has the opening in the center of the endtank, the side draw end has the opening on the side of the endtank.

Because I was not sure which direction the air would flow through the core when installed on the vehicle I tested the intercooler with air flowing through it in both directions.

This is a similar endtank configuration to some of the B5 S4 SMIC’s that are designed for the driver side.  It is interesting that on this design, drawing air in through the center hole causes a slight reduction in the airflow, this result is consistent with what is seen on the B5 S4 intercoolers.  This further reinforces my belief that the center draw style endtank is less effective for minimizing pressure losses than the side draw style.

The pressure loss curve for the center draw direction, which is the proper configuration when the intercooler is mounted on the car, is shown below.

Porsche GT2RS intercooler flow test

Audi B5 S4 Information and Testing