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Eventuri Intake Audi C7 RS6 RS7 Carbon
EVE-C7RS6-CF-INT
Intake AUDI C7 RS6 RS7
Increased Power: 15-19 HP, 13-17 Nm
V-box measurements: 100-200 km/h reduced by 0.342s
The Eventuri intake for the Audi C7 RS6/RS7 sets a new standard in intake design for this platform. It was developed with two main goals in mind:
1) Unlocking the paths to the turbocharger inlets.
2) Maintaining low inlet temperatures.
The first goal was achieved by providing each turbocharger with a separate filter and Venturi stack, reducing resistance and enabling more efficient turbocharger operation. The second goal was achieved by placing the filters inside a carbon fiber housing and supplying them with additional inlet air located behind the front grille. The engine bay of the C7 RS6/RS7 has many sources of heat from various directions, so a simple solution with open filters and shields would lead to higher inlet air temperatures (IAT). Our carbon fiber housing was designed to maximize the available volume and block all sources of heat. The performance and aesthetic results are industry-leading for C7 RS6/RS7 models. Learn more about Eventuri technology HERE.
Difference in the Eventuri System
For C7 RS6/RS7 models, the use of two Venturi stacks mounted on filters is implemented, smoothly transitioning into pipes to the turbochargers. They provide an aerodynamically efficient airflow path from the filters to the turbochargers. This is not just another cone filter with a heat shield but a unique design that utilizes the Venturi effect, allowing laminar flow through the entire pipes, reducing resistance for the turbochargers.
Dyno Testing
Extensive testing of this system was conducted both on the dyno and on the road. Firstly, dyno tests showed an impressive power increase of about 19 HP and torque increase of 17 Nm. This translates to increased response on partial and full throttle on the road, with the car significantly more eager to accelerate towards the redline. Tests were conducted on the same day, one after the other, and temperature was monitored for consistency. The car was tested first with the factory intake - closed hood. Then the car was left on the dyno, and the Eventuri intake was installed. The car was started again - with the hood closed. Several runs were made with both configurations to obtain consistent results.
Road tests were then conducted using a Vbox device to record acceleration from 100 to 200 km/h. Tests were performed on the same stretch of road again on the same day to minimize variables. The results show that adding just the intake resulted in a reduction in acceleration times from 100 to 200 km/h by 0.4 seconds, which is a significant change at such speeds.
Summary of Acceleration Results:
100-200 km/h with factory intake = 8.420 seconds
100-200 km/h with Eventuri intake = 8.078 seconds
Eventuri C7 RS6/RS7 Kit
The Eventuri intake system for C7 RS6/RS7 models consists of several components designed to meet a specific task and made from the highest quality materials. Here are the details of each of these components and their main design idea:
Each intake system comprises:
- Carbon fiber air filter housing
- 2 x High-performance air filters in dual cones
- 2 x Carbon fiber Venturi stacks with integrated pipes
- Carbon fiber air inlet
- Carbon fiber air scoop at the front
- Laser-cut thermal shield with gold reflection
- Laser-cut stainless steel mounting elements
- CNC machined air filter housing mounts
Carbon Fiber Air Filter Housing
The housing was designed to efficiently use the space after removing the factory Airbox. It protects the filters from many sources of heat in the engine bay. The most obvious source is the engine/turbocharger assembly, but there is also a heat exchanger under the headlight, which also emits significant heat. Additionally, when the radiator fan is on, a stream of hot air is pushed into the intake area from the side of the radiator, just below the duct. All these heat sources require a complete Airbox system as a shield - simple cones and heat shields cannot perform the same task. During development, we tested 2 open filters with heat shields, which resulted in a significant increase in inlet air temperature, causing power loss. The Airbox prevents these heat sources from negatively affecting the cone filters and is connected to a carbon fiber duct that supplies the housing with cold air.
Carbon Fiber Venturi Pipes
To connect our dual cone filters to the factory turbocharger pipes, we designed a pair of pipes with smooth curves and an innovative Venturi stack matched to the inner diameter of the filter neck. This curved shape allows for maintaining laminar airflow as it passes through the filter and enters the pipes - which is crucial at higher RPMs, where turbochargers draw air at high velocity. The pipe design leads to an aerodynamically efficient airflow path from the filters to the turbochargers, allowing the turbochargers to generate acceleration more efficiently and reducing lag. On the road, this is noticeable as the car responds to throttle input more sharply and eagerly, as acceleration is generated more quickly.
Flow Simulation
As part of the research and development process, we conduct flow simulations through our intake systems to ensure that our initial concepts and calculations are reasonable. Simulation also helps us further optimize the system for even smoother airflow if possible.
Flow simulation through a single pipe shows an increase in velocity from the filter to the outlet - as expected, as the cross-section decreases. It also shows a smooth transition between the filter and the pipe, with the Venturi stack allowing for narrowing airflow while maintaining laminar character.
Carbon Fiber Air Duct
We redesigned the intake duct to have a larger internal volume than the stock version. This duct feeds the Airbox with ambient air from the front grille, ensuring that the inlet temperature is as low as possible.
Carbon Fiber Air Inlet
The air inlet is located behind the front grille and introduces ambient air into the duct - the curves of the inlet ensure that airflow is directed as efficiently as possible during vehicle operation. This allows for a rapid decrease in temperature inside the Airbox after the vehicle stops and overheats.
Thermal Shield
The final element of this system is a thermal shield with laser-cut gold reflection, which protects the front part of the Airbox from direct heat from the turbochargers. The front of the airbox is in direct line with the upper part of the engine, where the turbochargers are located. When the engine reaches operating temperature and is under load, the turbochargers generate a significant amount of heat. This heat can quickly heat up the Airbox, so the shield provides a thermal barrier between the turbochargers and the Airbox to maintain low inlet temperatures. A thermal imaging video was recorded after several runs on the dyno (with the hood closed) to show the temperature difference between the hot side of the engine and the carbon fiber housing:
