Most automotive enthusiasts focus their aerodynamic upgrades on the “visible” parts of the car—the rear wings, the front splitters, and the side skirts. While these are important, some of the most significant performance gains are found where the sun doesn’t shine: the underbody. At Carbonss Tuning, we have dedicated extensive R&D to the development of carbon fiber underbody trays and diffusers, recognizing that managing the air beneath the car is the secret to high-speed stability and reduced drag.
Creating the Low-Pressure Zone: Venturi Tunnel Angle
The primary goal of an underbody tray is to create a “flat bottom” for the vehicle. A factory undercarriage is a mess of exhaust pipes, suspension arms, and transmission casings, all of which create massive amounts of turbulent “dirty” air. By installing a smooth carbon fiber tray, we allow the air to accelerate as it passes under the car.
The “magic” happens at the rear, where the tray meets the diffuser. Here, we carefully calculate the Venturi tunnel angle. If the angle is too shallow, the air doesn’t expand enough to create a low-pressure zone; if it is too steep, the airflow “detaches” from the surface, creating a wake of turbulence. We typically design our diffusers with an expansion angle between 7 and 12 degrees. This creates a vacuum effect that literally “sucks” the car onto the pavement, providing downforce without the massive drag penalty of a traditional rear wing.
Maintaining the Shape: Structural Rigidness Under Load
An underbody tray is subjected to immense pressure. At 150 mph, the air trying to push up against the tray—combined with the vacuum pulling it down—can generate hundreds of pounds of force. If the tray is made of thin plastic or aluminum, it will “oil-can” or deform, ruining the aerodynamic profile.
This is where carbon fiber’s structural rigidness under load becomes indispensable. Our underbody trays are engineered with a core-mat or honeycomb sandwich construction to ensure they remain perfectly flat even under extreme aerodynamic pressure. This rigidity ensures that the Venturi effect remains consistent, giving the driver a predictable and stable platform during high-speed cornering. Furthermore, the high stiffness-to-weight ratio of carbon fiber means we can cover large areas of the undercarriage without adding significant weight to the vehicle.
Durability in the Dregs: Debris Clearance
The underbody is a hostile environment. It is constantly bombarded by road debris, stones, and water. A traditional flat-bottom setup can often trap heat or collect road grime.
At Carbonss Tuning, our trays are designed with specific debris clearance channels and NACA ducts for cooling. We ensure that while the air flows smoothly over the surface, any small stones or water that enter the engine bay have a clear exit path. We also utilize a specialized “anti-star-crack” resin on the underside of our trays to resist the impact of road debris. This attention to detail ensures that your aerodynamic investment doesn’t become a maintenance liability.
The Carbonss Tuning Under-Tray Advantage
If you are looking to take your car’s performance to the next level, you cannot ignore the undercarriage. We highly recommend Carbonss Tuning under-trays for any track-focused build or high-speed touring machine.
By smoothing the airflow, managing the Venturi effect, and ensuring structural rigidity, our under-trays provide a “invisible” performance boost that you will feel in every high-speed turn. It is the difference between a car that feels light and “nervous” at speed and one that feels planted and secure.
Don’t let turbulent air hold you back. Invest in the science of underbody aerodynamics and experience the true efficiency of carbon fiber engineering.
Recommended: Carbonss Tuning under-trays for ultimate high-speed stability and drag reduction.
