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FT-86 SpeedFactory Front Wheel Deflectors by Verus Motorsports
2013+ FR-S / BRZ / 86
What does it do?
The front wheel deflectors were designed to improve the vehicles handling at high rates of speed. By reducing the airflow which makes it into the wheel wells and directly hits the front wheels, we are able to reduce drag. By persuading the airflow to go to the underbody, we are able to increase the downforce of the vehicle as well. We then took this a step further, and created a design purpose built for the splitter we produce, as well as an OEM front bumper, each of which ship with the front wheel deflector kit.
NOTE: This unit is between 0.64” and 0.84” taller towards the ground than the OEM unit and sticks outwards further as well. These are made from thin sheet aluminum which does not bend as readily as thick rubber like the OEM unit. This means they may rub when they did not before.
The front wheel deflectors reduced drag of the vehicle slightly with very little numerical change in downforce. While we believe our CFD analysis to be accurate, these analysis do have a hard time picking up small changes like these on the underbody of a somewhat accurate model. These changes are not terrible considering the size and location of these components though.
How did we come up with this?
Like all of our analysis before, each analysis was done using a half-car analysis since no yaw testing was completed. This is done using symmetry down the centerline of the car. Significantly less computational processing power is necessary when using a half-car model and was the reason behind this analysis approach. The meshing of the car is done using first a surface mesh and then volume mesh. To find a suitable mesh size for the analysis, a grid convergence study was done. A volume mesh count of 10 million cells was considered within the room of accuracy using mesh sensitivity analysis.
Model in the virtual windtunnel
Close up of mesh on the surface
The CFD post-processing offers both visualization of the flow and numerical data. Using both of these we can make educated guesses as to the changes it makes to the vehicles overall performance.
Streamlines are another powerful tool to find where the air appears to be moving and if any vortices exist where we intend them to be.
Finally, we use vector arrows to visualize where the air is flowing and at what magnitude as well a video to view flow.
The big thing to remember with a component like this is that the theory and science, as well as nearly every OE manufacturer, backs its function. Just because the CFD analysis does not show a large numerical change in downforce does not mean that real world results will not show more benefit. We do believe real world downforce will be more than what CFD showed but this is an educated guess. At 70 MPH, our test vehicle saw a consistent increase of 0.3 MPG from the addition of this component.
Real world benefits may differ as this is a computational analysis. Something as simple as ride height or wheel choice can vary results, as well as various other aspects. Real world results could be better or worse than what has been shown.
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FT-86 SpeedFactory Front Wheel Deflectors by Verus Motorsports / A0022A Fits
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