Do vortex generators actually improve a car’s aerodynamics — or are they just a placebo mod?
In this video I run CFD simulations on two icons: the Nissan Skyline R32 and the 2022 Subaru WRX. I tested both cars with and without vortex generators placed at the rear of the roof (right before the rear window), then compared the results.
What happened?
✅ Drag: basically no change
⚠️ Lift: increased on both cars (worse for stability / “downforce”)
I’ll walk through why this can happen, show the flow behavior around the roof-to-rear-window region, and break down what this means if you’re thinking about adding VGs to a street car.
If you like CFD-based car aero tests, subscribe — I post regular aerodynamic deep-dives and ranked results across different cars and modifications.
Chapters
00:00 Intro + hypothesis
00:45 Skyline R32 — baseline
02:45 Skyline R32 — vortex generators
05:00 WRX 2011 — baseline
05:30 WRX 2011 — vortex generators
07:00 Why lift increased (flow explanation)
08:00 What to do instead + takeaways
This video uses computational fluid dynamics (CFD) to analyze automotive aerodynamics, including velocity planes, pressure fields, dynamic pressure, streamlines, and drag production orbits. Topics include drag coefficient, wake structure, diffuser design, wheel aerodynamics, pressure recovery, lift and downforce, and rear separation in road cars and supercars.
#CFD #Aerodynamics #VortexGenerators #SkylineR32 #NissanSkyline #WRX #SubaruWRX #CarAero #Downforce #Drag
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