Intake system Audi B9 S5 / S4 Carbon Eventuri

The intake system was road tested using a Vbox unit to record acceleration from 100 to 200 km/h. Tests were conducted on the same stretch of road - again on the same day to minimize variables. Results show that simply adding power reduced acceleration times from 100 to 200 km/h by 0.33 seconds, which is a significant improvement at such speeds. This demonstrates that gains measured on a dyno do not reflect how an intake performs on the road when it has proper airflow conditions - on the road, power delivery shows greater gains by reducing acceleration times compared to the dyno.

Performance Testing

Acceleration Results Summary:

100-200 km/h with factory intake = 12.45 seconds
100-200 km/h with Eventuri intake = 12.12 seconds

Gains come from a combination of reasons:

1. The sealed system maintains low inlet air temperatures - especially with the front air scoop, which forces airflow into the system.

2. The Venturi housing provides a smooth transition from filter to inlet pipe without convoluted rubber sections. This helps the turbine work more efficiently by maintaining laminar flow in the inlet track.

3. The entire system is made from pre-preg carbon fiber, which insulates from heat effectively.

Eventuri Kit

The B9 S4/S5 Eventuri intake consists of several components designed to fulfill a specific task and crafted with the utmost care. Here are the details of each component and its design concept:

Each intake system consists of:

• Carbon fiber Venturi housing with integrated pipe
• High-flow Gen-2 filter
• Carbon fiber inlet channel
• Carbon fiber front air scoop
• High-quality silicone connectors and hose clamps meeting OEM specifications
• Laser-cut stainless steel mounting brackets
• CNC machined mounting plugs

Carbon Fiber Inlet Housing

This gradual decrease in cross-sectional area induces the Venturi effect, where the airflow accelerates while maintaining laminar conditions. This can be compared to a large velocity funnel - below is a diagram comparing our patented design to a standard intake system. Our individually crafted filters aid airflow passing through the housings and allow for an even velocity profile as airflow exits the housings.

Carbon Fiber Inlet Channel

The channel directs air from the scoop to the filter housing. It also creates a sealed volume of air surrounded by the scoop to provide filters with a ready source to draw from. The channel is designed to make the most of the available volume in the engine bay. To ensure good insulation from heat from the engine bay, the channel features flexible rubber seals around openings that press against the filter housing and factory inlet channel, creating the desired seal while allowing the housing to move with the engine. To further increase airflow, we added a second opening at the back of the channel in the cold zone of the engine bay. This geometrically complex element is a key part of our design for B9 S4/S5 models.

Carbon Fiber Front Air Scoop

The final carbon fiber component in this system is the front scoop - essential for directing atmospheric air to the channel and then to the filter.

The scoop is designed with a constant curvature radius for maximum efficiency in directing incoming air to the channel openings. This allows for maintaining the lowest possible inlet air temperature and increases the rate of inlet temperature drop after the system has been heat soaked during a stop.

Specially Crafted Mounts

To ensure a perfect fit, we devote a lot of time to developing mounts. Just like in all our intakes, the mounts are specially designed for a given application, and for the B9 S4/S5 system, the mounts are laser-cut from stainless steel, then powder-coated for durability. They are then CNC machined mounts that are fastened to the brackets and clamped to the factory rubber mounts used by the factory airbox. This ensures that our intake fits just as snugly as the factory system.

All components come together in the engine bay, creating a genuine improvement to the driving experience and providing an amazing visual presentation of form and function in total harmony.