Exploring Underbody Flow Management for the 991.2 GT3 RS Aero Kit: 3D Printing & CFD Analysis

Category Aerodynamics & Aeroacoustics

Thread starter Administrator
Start date Mar 13, 2025

Hey everyone!

I’ve started working on the aero kit for the 991.2 GT3 RS, focusing specifically on managing the underbody airflow with some custom strikes. To ensure the fitment and functionality, I used a scan of the 991.2 GT3 RS as a base to model and 3D print some test pieces. These pieces will help us test the fitment before moving forward with more advanced design refinements.

Next step is to perform CFD (Computational Fluid Dynamics) analysis to further fine-tune the design and make sure we’re getting optimal performance. I’m excited to see how this project progresses and will be sharing updates as I go.

Anyone here worked on similar aero mods? Would love to hear your thoughts or experiences!

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Adam G

Owner & Operator of GTWerks

Engineer and auto enthusiast with a background in designing some of the fastest production and NASCAR race cars. Now focused on understanding, maintaining, and enhancing Porsche GT cars, including the GT2 RS, GT3, GT3 RS, GT4, and GT4 RS.

3D printing is complete! Now it’s time to test the fit and confirm my design. I printed this on my Prusa MK4 using Prusment PLA. Since the part was too large for the bed, I split the model into three pieces. I prefer this approach because if something goes wrong, I only need to reprint one section instead of the whole part. For assembly, I used super glue—sets in 10 minutes and I gave it 24 hours to fully cure. The bond feels solid so far!

Next step: If needed, I’ll update the model, re-test the fit, then print the final design. After that, it’s installation and off to road testing!