Performance increase: 15 HP, 18 foot-pounds
*The images show our engine cover in optional carbon.
The GR Yaris system Eventuri uses our patented carbon fiber housing that provides an aerodynamically efficient airflow path from the filter to the turbo. Not just another conical filter with a heat shield, but a unique design that mimics the Venturi effect and keeps the laminar flow conditions to reduce drag on the turbo.
Performance increase: 15 HP, 18 foot-pounds
*The images show our engine cover in optional carbon.
The GR Yaris system Eventuri uses our patented carbon fiber housing that provides an aerodynamically efficient airflow path from the filter to the turbo. Not just another conical filter with a heat shield, but a unique design that mimics the Venturi effect and keeps the laminar flow conditions to reduce drag on the turbo.
The GR Yaris air intake has been developed using extensive temperature, flow and dynamometer data logging. As this is a turbocharged engine, heat and volume were the main factors taken into consideration during development. This intake system has been developed to deliver the highest possible flow rate whilst maintaining the lowest possible intake temperatures. Every component has been designed to provide a smooth and free-flowing path for the turbo. By ensuring a sealed system we have improved on the OEM airbox IATs whilst increasing the internal volume to reduce pressure drop and therefore reduce turbo pumping losses. This allows the turbo to operate more efficiently and therefore reaches maximum boost sooner to produce a net gain in performance.
The filter itself has an external diameter of 210mm or 8.3" with a filtration surface area of over 130,000mm^2. The patented venturi housing has been designed to provide the maximum internal volume possible for the GR Yaris and provides laminar flow to the turbo pipe.
Dyno Testing
Our GR Yaris intake has been tested by various reputable tuners around the world, all of whom have reported similar results. The first dyno plot is from RaceCal in the UK. Several runs were carried out with the OEM airbox to get a repeatable result and then again with the Eventuri intake. The tests were run on the same day consecutively with the hood closed. The results show an increase in torque and power across the entire rev range, not just at the top end, which is why the car feels more responsive and is able to accelerate through the gears more quickly. Ambient temperatures during this session were 11.9°C for the OEM airbox and 15.6°C for the Eventuri - the temperature increase was due to the cell warming up on the dyno after running the stock airbox.
Dyno Results Summary
The second set of results comes from Hong Kong-based Master Tuning Asia, who tested the intake against the stock airbox on the same day and this time in warmer conditions, around 32C. The systems were tested 3 times and all 3 graphs show gains across the entire RPM range, with the third run showing the highest gain as the stock airbox struggled with the IAT.
The Eventuri intake system The GR Yaris is made up of a series of components designed to perform a specific purpose and manufactured to the highest standards. We use 100% pre-preg carbon fibre with no fibreglass, which means we can achieve a smooth internal surface to maintain smoother airflow. Here are the details for each component and the design ethos behind them:
Each intake system consists of:
FILTER HOUSING ASSEMBLY
The filter housing consists of our bespoke second generation filter, aluminium inlet bonnet, stainless steel bracket and integrated MAF section. The carbon pod shrouds the reverse mounted filter and gently shapes the airflow to the MAF section which then connects to the rear inlet pipe. This changes the flow path from the OEM airbox where the airflow enters the front of the airbox, changes direction 90 degrees to pass through the panel filter and then changes direction 90 degrees again to pass through the MAF section. Our system is much more direct with the airflow entering the front of the filter housing and moving into the MAF section without any abrupt changes in direction. The result is a smoother path from the filter to the turbo inlet pipe and therefore the turbo is able to operate with less resistance.
CUSTOM CONE FILTER
To achieve the highest possible flow rate we have used our largest filter which has an outside diameter of 210mm or 8.3" and when flow tested with a 4" opening housing it is capable of flowing up to 940 CFM at 28" H2O. The filter media is ISO tested to ensure the filtration is in line with OEM standards and is also dry. The filter is constructed with our signature flow cones to aid in the Venturi housing principle.
PATENTED TECHNOLOGY
Our patented filter housing has a uniform reduction in cross-sectional area as it wraps around the filter and tapers towards the tube. This geometry is reminiscent of the Venturi effect where the airflow accelerates while maintaining laminated conditions. It can be thought of as a large velocity stack - below is a diagram to show how our patented 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. Further details can be read on the Technology and Filters pages.
The duct feeds the filter housing with ambient airflow from the front bumper/grille section. We kept the volume as large as possible all the way to the front of the engine bay and de-confined the front of the duct by creating an opening just behind the bumper where the hood would close. This area of the engine bay remains at ambient temperature while the car is moving and so the intake is able to draw air without being restricted to the small opening behind the grille. We did not extend the duct to the other side of the engine bay to utilize the second opening in the grille simply because of the sharp flow angle and restriction in the space between the engine and the hood latch. Additionally, using the second opening would prevent cold air from entering the engine bay to help reduce overall heat absorption. Finally, the duct seals against the filter housing with an expandable rubber gasket that allows the filter housing to move with the engine without drawing in hot air.
REAR PIPE AND EPDM JOINT
The final components of the system are the rear inlet pipe and EPDM joint. The OEM rear pipe has a sharp internal bend radius and at high flow rates, this can cause unwanted turbulence which can affect the efficiency of the turbo. We have redesigned the rear pipe to allow for a smoother bend which has also allowed for a more optimal positioning of the filter housing. To cope with the heat at the rear of the engine this pipe is made from a thermoplastic with glass fibre reinforcement. There is also a CNC machined reinforcing ring in the rear connection where the clamp would be attached. This prevents distortion under heavy clamping pressure, as also used in the OEM hose. The connection between this hose and the filter housing is achieved with a custom EPDM joint that allows for vibration and engine movement.
