EVE-B9S5-CF-INT

Eventuri® (17-23) Audi S4/S5 B9 Carbon Fiber Cold Air Intake System

Name: Eventuri® (17-23) Audi S4/S5 B9 Carbon Fiber Cold Air Intake System
Brand: Eventuri®
Price: 1550.0 USD
Availability: InStock

$1,550.00

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Compatible: (3.0L)

2017 - 2023 Audi S4 B9

2017 - 2013 Audi S5 B9

The Audi B9 S4/S5 Eventuri intake was developed to give less restrictive airflow to the turbo whilst maintaining low inlet temperatures. The S5/S4 engine bay becomes heat soaked very quickly so simply having an open cone system would result in better airflow but with higher inlet temperatures. We therefore completely re-engineered the inlet track from the turbo inlet pipe to the front grill with a highly efficient sealed system. The restrictive stock airbox and flexible plastic inlet pipe have been replaced with a Venturi filter housing and a duct system with smooth transitions. Furthermore, by removing the convoluted stock inlet pipe and replacing it with our one-piece Venturi housing and solid tube, the airflow is much smoother as it enters the turbo inlet tube. The resulting performance gains and aesthetics are industry leading for this platform.

The Eventuri Difference

The B9 S4/S5 Eventuri system uses our Patent Pending Carbon fibre Housings with our bespoke Gen-2 filter which provide an aerodynamically efficient airflow path from the filter to the inlet tubes. Not just another cone filter with a heat shield but a unique design which invokes the Venturi affect.

With so many aftermarket intakes available, the natural question arises:

“So what’s so special about the Eventuri Intakes?”

There are two main elements in explaining the answer to what sets us apart from the rest:

The Patented Eventuri filter housing design
Our Bespoke Filters
Our emphasis on creating a “Complete Solution”

The Patented Eventuri Filter Housing

Even at first glance the Eventuri intake looks very different to many other aftermarket intakes. Unlike the majority of intakes, which use the same cone filter/tube/heat shield configuration, the Eventuri design is fundamentally different and has been Patented.

AFTERMARKET INTAKE SYSTEMS

Most aftermarket intakes use a cone filter mated to an inlet tube with some type of heat shielding. In this configuration airflow must negotiate a path from the large diameter at the base of the filter through to the smaller diameter of the inlet tube in a relatively short distance. There is usually a velocity stack at the base of the filter to help with the transition, however the stack is usually small. This sudden transition in geometry is detrimental for flow. The result is a loss of throttle response and performance gains are usually limited over the OEM intake system. The diagram below shows a typical aftermarket intake using a cone filter secured to an engine inlet tube. The filter uses a standard velocity stack, which has been highlighted in yellow.

Airflow-Cone

THE EVENTURI INTAKE SYSTEM

The Eventuri is a new type of intake design, which has been granted a patent. We use a cone filter – but here it is inverted and decoupled from the inlet tube. By removing the direct connection between the filter and the inlet tube, the filter is no longer dictating the shape of the airflow. This is now being done by the carbon housing, which is designed to smoothly guide the air into the inlet tube without a sudden change in geometry. This means that we keep laminar conditions throughout the intake, which is a lot more efficient. Furthermore, the funnel-shaped housing invokes the Venturi effect where the smooth reduction in cross-sectional area along the length of the housing causes the airflow to increase in velocity. Essentially the entire housing acts as a large velocity stack. On the road this translates to more power with a smoother delivery as well as sharper throttle response since the airflow is not inhibited by abrupt geometry changes andso is more likely to remain laminar. The diagram below shows an Eventuri intake system using a reverse mounted filter inside an Eventuri housing. The large velocity stack area is highlighted in yellow.

Airflow-Eventuri

Eventuri Bespoke Filters

To compliment our unique filter housings we designed our filters specifically for this reverse mounted configuration in order to provide the optimum airflow through the system.

The Complete Solution

The final element to our design – which is as important, is our emphasis on creating a complete solution. We dedicate a lot of design effort on ensuring the filter housings are provided with ambient air in the most efficient way possible. Allowing the filters to draw in heated air from the engine bay defeats the objective and in many cases is the cause of an actual loss in power over the stock system once the engine bay is heat soaked. Simply using heat shields is not enough – there must also be a method of channeling cold air into the intake. This is where we have seen some companies use “scoops” but on closer inspection are usually very flat and almost perpendicular to the oncoming air. Not the ideal solution for trying to redirect air at high speeds! Our scoop designs have, where possible a curved face for as much of the exposed area as possible in order to smoothly redirect incoming air to the filters. In doing so we ensure that engine bay heat is displaced and so intake air temperatures are kept as low as possible.

From scoop to duct to housing to inlet tubing – by utilizing organic shapes, we invest a great deal of time and effort in providing a smooth path for the airflow to follow. Hence ensuring maximum efficiency of the system.

The intake was tested on the road using a Vbox unit to record the acceleration from 60-130mph (also 100-200Km/h). Testing was carried out on the same stretch of road - again on the same day to keep variables minimum. Results show that with just the intake added, the acceleration times from 60-130mph reduced by almost 0.5 seconds which is a significant improvement at such speeds. This demonstrates that the gains measured on the Dyno are not represenatative of how the intake performs on the road when it has the correct flow conditions - on the road the intake shows a larger gain by the reduction in acceleration times as compared to the Dyno.

Acceleration results summary:

60-130mph with Stock intake = 14.72 seconds
60-130mph with Eventuri intake = 14.24 seconds
100-200Km/h with Stock intake = 12.45 seconds
100-200Km/h with Eventuri intake = 12.12 seconds

The gains are from a combination of reasons:

1) The sealed system keeps IATs low - especially with the front air scoop which forces air into the system.

2) The Venturi housing provides a smooth transition from the filter to the intake tube with no convoluted rubber section. This helps the turbo to run more efficiently by maintaining laminar flow in the inlet track.

3) The entire system is constructed from pure pre-preg carbon fibre which is great at insulating from heat.

The Eventuri B9 S4/S5 intake system consists of a number of components engineered to perform a specific purpose and fabricated to the highest of standards. Here are the details for each component and the design ethos behind them:

Each intake system consists of:

Carbon Fiber Venturi housing with intergated tube
High Flow Generation 2 Filter
Carbon Fiber Intake Duct
Carbon Fiber Front Scoop
High Quality Silicon Couplers and OEM Spec Hose Clamps
Laser Cut Stainless Steel Bracket Work
CNC Machined Mounting Stubs

Carbon Intake Housing Assembly

The filter housing comprises of our bespoke generation 2 filter, the carbon pod and integrated tube. The carbon pod shrouds the reverse mounted filter and smoothly shapes the airflow down to the turbo tube which it matches in diameter to the turbo tube. This is a key feature of the intake design where we have removed the requirement for a convoluted rubber hose between the intake and the engine. The filter housing and integrated tube extends all the way to the stock turbo tube and by mounting this to the engine, the entire filter housing moves with the engine. As the engine and filter housing moves under acceleration, it is able to maintain a seal to the duct through the use of an expanding rubber extrusion which is mounted to the face of the duct (see below).

This smooth reduction in cross sectional area invokes the Venturi effect where the airflow accelerates whilst maintaining laminar conditions. It can be thought of as a large velocity stack - below is a diagram to show the comparison between our patent pending design and a regular intake system. Our bespoke filters aid the airflow moving through the housings and allow for an even velocity profile as the airflow exits the housings. Further details can be read in the Technology and Filters pages.

Carbon Fiber Intake Duct

The duct channels ambient air from the scoop to the filter housing. It also creates a sealed volume of ambient air before the filter so that there is a ready supply which the filter can draw from. The duct has been designed to take maximum advantage of the volume available in the engine bay. In order to ensure a good seal against engine bay heat - the duct also has a flexible rubber edging around the openings which press against the filter housing and OEM front duct creating the desired seal yet allowing the housing to move with the engine. To further enhance the airflow we added a secondary opening at 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 Scoop

The final carbon components in this system is the front scoop - essential to direct ambient air to the duct and then to the filter.

The scoop was designed with a constant bend radius for maximum efficiency in directing the incoming air to the duct opening. It allows the inlet air temperatures to be as low as possible and increase the rate of drop in IATs after the system is heat soaked during a standstill.

Custom Bracket Work

To ensure a perfect fit we spend a lot of development time on the mounting hardware. Like all our intakes, the brackets are specifically designed 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 secured to the brackets and push into the stock rubber mounts which the stock airbox uses to secure to. This ensures our intake fits just like the OEM system.

All the components come together in the engine bay to produce a genuine improvement in the driving experience as well as providing an incredible visual display of form and function in complete harmony.