Mounting aerodynamic devices directly to a car's suspension can have both advantages and disadvantages. This approach, known as "suspension-mounted aerodynamics," involves attaching wings, splitters, diffusers, or other aerodynamic components to the suspension system rather than the body of the car. Here are some advantages and disadvantages of this approach:

Advantages:

1. Steady Airflow: As the suspension moves, the aerodynamic devices attached to it can maintain a relatively steady relationship with the airflow. This can lead to consistent downforce and aerodynamic balance, even during suspension travel due to bumps or cornering loads.
2. Dynamic Adjustability: Suspension-mounted aerodynamics allow for the adjustment of aerodynamic components in real-time based on suspension compression, vehicle speed, and other factors. This adaptability can optimize downforce levels for different track conditions or driving situations.
3. Aerodynamic Performance: By maintaining a consistent angle of attack relative to the oncoming airflow, suspension-mounted aerodynamic devices can offer improved efficiency in generating downforce compared to body-mounted devices that may experience varying angles during suspension travel.

Disadvantages:

1. Complexity: Integrating aerodynamic components into the suspension system adds complexity to the overall design. This complexity can increase manufacturing and maintenance costs, as well as the risk of mechanical failures.
2. Impact on Suspension: The additional weight and aerodynamic forces exerted on the suspension components can affect the suspension's performance and responsiveness. This may lead to compromises in handling and ride quality.
3. Dynamic Changes: Suspension-mounted aerodynamics are highly dependent on suspension movement, which can vary significantly during different phases of a race or under different driving conditions. This can result in unpredictable changes in downforce levels and vehicle behavior.
4. Tuning Challenges: Tuning suspension-mounted aerodynamic components requires a deep understanding of both aerodynamics and suspension dynamics. Achieving the desired balance between downforce, drag, and handling can be challenging and time-consuming.
5. Regulatory Concerns: In some racing series, regulations might limit the types of modifications that can be made to the suspension system. This could potentially restrict the implementation of suspension-mounted aerodynamics.
6. Interference with Setup: Suspension-mounted aerodynamic components may interact with other aspects of the vehicle setup, such as ride height adjustments or suspension geometry changes, making it more challenging to optimize the overall performance of the car.

In summary, suspension-mounted aerodynamics offer the potential for maintaining steady airflow and dynamic adjustability, which can enhance aerodynamic performance under certain conditions. However, the added complexity, potential negative effects on suspension dynamics, and tuning challenges make this approach a trade-off that racing teams need to carefully consider based on their specific needs and regulations.