TM
Venturi Air Intake E60 E61 M5 / E63, E64 M6 - S85 5.0 V10
“ T h e E v e n t u r i w a s e n g i n e e r e d t o i n c r e a s e e n g i n e p e r f o r m a n c e , i m p r o v e d r i v a b i l i t y a n d e n h a n c e t h e o v e r a l l d r i v i n g e x p e r i e n c e . ”
TM
There were two main considerations to balance when designing the Evolve VAi kit: Aerodynamic efficiency and Inlet air temperatures. Aerodynamic Efficiency For aerodynamic advantages an open system was adopted but not in the “normal” aftermarket method. To ensure a less restrictive design alongside maintaining high air-speeds the Venturi Effect was implemented. This can be clearly seen from the shape of the carbon fibre housing and the location and shape of the air filter. The entire carbon fibre housing is a Venturi where the airflow increases in velocity as the cross sectional area reduces from the mouth (filter opening) to the outlet into the MAF tube. By inverting the cone and placing it on the mouth of the intake, the carbon fibre housing dictates the shape of the airflow. As this is essentially a large funnel - the airflow remains laminar and therefore minimises the drag of the system.
“The difference in throttle response and agility is huge. The performance is great, they look awesome and the noise is really special”
CFD (Computational Fluid Dynamics) Analysis Here is a CFD model showing the difference in airflow between the Evolve VAi and a regular cone filter.
to maf sensor
to maf sensor
Cone Filter in Normal Orientation
Cone Filter Reversed in Eventuri Housing
It is apparent that the airflow has to negotiate through some abrupt angles which results in the formation of turbulence towards the MAF sensor. The sudden change in flow path geometry at this outlet causes non-uniform distribution of flow trajectories. This translates on the road to poor throttle response and reduced lowmid range torque where the flow is not fully developed.
With the Eventuri housing now dictating the path of the airflow, we can see a more uniform distribution from the inlet of the intake to the outlet leading to the MAF sensor. The flow path is much more efficient with laminar flow filling the outlet tube evenly. This results in more consistent power delivery and a sharper throttle response making the car feel more lively.
TM
upper air scoops
Intake Air Temperatures (IAT)
Located behind the front grills, these scoops displace heated air from around the intake area with ambient air. The design is a curved shape to optimise airflow.
The OEM intake assembly, being a sealed system is very efficient at keeping IATs close to ambient when the engine is under load – wide open throttle driving conditions. However, data logging clearly shows that under idle and slow speed driving conditions IATs will always be high for a sealed or open system. This is due to heat soaking of the intake assembly from engine heat as well as the recirculation of hot air from the breather system. To ensure the Evolve VAi open system came as close as possible to the OEM system, two pairs of air scoops and one pair of radiator deflector shields were engineered. With all three components installed IATs are equivalent to the OEM sealed system under load – wide open throttle driving conditions.
LOWER air scoops
These scoops are located in the lower air ducts forcing ambient air directly into the open mouth of the Evolve VAi’s.
radiator deflector shields
Located on the engine side of each intake. Their purpose is to deflect hot air from the radiator especially when the radiator fan comes into operation.
Conclusion of IAT’s and Airflow By maintaining low IATs and significantly improved aerodynamic efficiency, the Evolve VAi system meets the initial design brief of: Increased Engine Performance This is clearly apparent through the increase in power under both partial and full load engine conditions especially low-mid (10005000) RPM driving where the S85 suffers from inconsistent and weak power delivery Dyno testing, where airflow is equivalent to road conditions confirms the above with increases of 10-15 horsepower.
Enhanced Overall Driving Experience The carbon fibre housing coupled with the open design gives rise to a resonating and deep induction roar similar to that of a racing V10 engine. However, unlike a simple open cone filter, the Evolve VAi’s produce a refined pulsing symphony under varying engine speeds and engine loads both inside and especially outside the car.
Improved Drivability A result of the Venturi effect is the improvement in air speed especially under transient throttle openings. The direct effect is improved throttle response which makes the engine feel more alive.
Testing and Results Dynamometer testing was carried out on the Evolve load bearing Dyno Dynamics DS450 under shoot out mode 8 with SAE correction. Tests were carried out consecutively and repeated to ensure consistency.
The results from repeat runs clearly show a pattern. The lower rpm range shows significantly improved torque and horsepower up to 5250rpm. Beyond this point horsepower continuously builds to the rpm
limiter in comparison with the OEM intake with charcoal filters deleted and frontal scoops installed.
Component Features The Eventuri System comprises of 79 individual components. Here are some of the key components and their features:
Prepreg Carbon Fibre Venturi Housings Stainless Steel plaques with individual serial numbers
BMW OEM Hose Clamps High Quality 2mm Silicone Hoses
3mm Laser Cut Stainless Steel Brackets Replacement Anti-vibration mounts
2mm Laser Cut Powder Coated Heat Deflectors Neoprene Lined
CNC Machine Anodised Aluminium Mass Air Sensor Tubes CNC Machined Engineering Plastic MAF Bosses
2mm Aluminium Powder Coated Upper Scoops 2mm Laser Cut Powder Coated Lower Scoops
Aluminium Spun Intake Cowlings
High Flow Racing Air Filters
The MOST comprehensively engineered intake system in the world
CNC Machined Engineering Plastic Adapter Breather Filter with Mounting Clamp
For pricing and availability contact us
sales@evolveautomotive.com +44 (0)1582 584 000