AUDI B9 S4 S5
The B9 S4/S5 Eventuri system uses our patent-pending carbon fiber housings with our custom-built Gen-2 filter providing an aerodynamically efficient airflow path from the filter to the inlet pipes. Not just another conical filter with a heat shield, but a unique design that recalls the Venturi effect.
Performance increase: 13-17 HP, 15-20 ft-lbs
V-Box acceleration: 60-130 mph reduced by 0.5 seconds
AUDI B9 S4 S5
The B9 S4/S5 Eventuri system uses our patent-pending carbon fiber housings with our custom-built Gen-2 filter providing an aerodynamically efficient airflow path from the filter to the inlet pipes. Not just another conical filter with a heat shield, but a unique design that recalls the Venturi effect.
Performance increase: 13-17 HP, 15-20 ft-lbs
V-Box acceleration: 60-130 mph reduced by 0.5 seconds
The Audi B9 S4/S5 Eventuri intake was developed to provide less restrictive airflow to the turbo while maintaining low inlet temperatures. The S5/S4 engine bay heats up very quickly, so simply having an open cone system would result in better airflow but higher inlet temperatures. We therefore completely redesigned the inlet path from the turbo inlet pipe to the front grille with a highly efficient sealed system. The restrictive stock airbox and flexible plastic inlet tube have been replaced with a venturi filter housing and duct system with smooth transitions. Additionally, by removing the convoluted stock inlet tube and replacing it with our one-piece venturi housing and solid tube, the airflow is much smoother as it enters the turbo inlet pipe. The resulting performance gains and aesthetics are industry leading for this platform.
The intake was road tested using a Vbox unit to record acceleration from 60-130 mph (also 100-200 km/h). Testing was performed on the same stretch of road, on the same day to minimize variables. Results show that with just the added intake, acceleration times from 60-130 mph were reduced by nearly 0.5 seconds, which is a significant improvement at those speeds. This shows that the gains measured on the Dyno are not representative of how the intake performs on the road when it has the correct flow conditions: on the road the intake shows a greater gain due to the reduction in acceleration times compared to the Dyno.
Acceleration results summary:
The benefits come from a combination of patterns:
1) The sealed system keeps IATs low, especially with the front intake forcing air into the system.
2) The venturi housing provides a smooth transition from the filter to the intake pipe without convoluted rubber sections. This helps the turbo run more efficiently by maintaining laminar flow in the inlet runner.
3) The entire system is built in pure pre-impregnated carbon fiber, which is excellent for insulating from heat.
The Eventuri B9 S4/S5 intake system is made up of a series of components designed to perform a specific purpose and manufactured according to the highest standards. Here are the details for each component and the design ethic behind them:
Each intake system consists of:
Carbon Intake Housing Assembly
The filter housing consists of our custom-built 2nd generation filter, carbon pod and integrated tube. The carbon pod wraps around the reverse mounted filter and gently shapes the airflow to the turbo pipe, which matches the diameter of the turbo pipe. This is a key feature of the intake design, where we eliminated the need for a convoluted rubber hose between the intake and the engine. The filter housing and integrated pipe extends all the way to the stock turbo pipe, and by mounting it to the engine, the entire filter housing moves with the engine. As the engine and filter housing accelerate, they are able to maintain a seal to the duct through the use of an expandable rubber extrusion that is mounted on the face of the duct.
This smooth reduction in cross-sectional area is reminiscent of the Venturi effect, where the airflow accelerates while maintaining laminar conditions. It can be thought of as a large velocity stack - below is a diagram showing how our patent pending design compares to a typical intake system. Our custom filters help the airflow move through the housings and allow for a smooth velocity profile as the airflow exits the housings. More details can be found on the Technology and Filters pages. Carbon Fiber Intake Duct The duct directs ambient air from the scoop into the filter housing. It also creates a sealed volume of ambient air before the filter so that there is a ready supply for the filter to draw from. The duct has been designed to make the most of the available volume in the engine bay. To ensure a good seal against engine bay heat, the duct also has a flexible rubber lip around the apertures which press against the filter housing and OEM front duct creating the desired seal but allowing the housing to move with the engine. To further improve airflow we have added a secondary aperture to the rear of the duct in the cold region of the engine bay. This geometrically complex piece is a key part of our B9 S4/S5 design. Carbon Fiber Air Intake The final carbon components in this system are the front scoop, which is essential for directing ambient air into the duct and then onto the filter. The vane is designed with a constant radius of curvature for maximum efficiency in directing incoming air toward the duct opening. Allows inlet air temperatures to be as low as possible and increases the rate of IAT decline after the system has been subjected to thermal absorption during a shutdown.
Bracket Work custom
To ensure a perfect fit, we spend a lot of time developing the hardware assembly. Like all our intakes, the brackets are designed specifically for the application and for the B9 S4/S5 system, the brackets are laser cut from stainless steel and then powder coated for durability. The CNC machined mounts are then bolted onto the brackets and pushed into the stock rubber mounts that the stock airbox uses to secure to. This ensures our intake will fit exactly like the OEM system.
All the components come together in the engine bay to produce a genuine improvement in the driving experience and provide an incredible display of form and function in complete harmony.
