Performance Increase: 14whp 19ft-lb mid-range; 9whp 9ft-lb peak rpm
The Eventuri Carbon Turbo Tube for the Toyota GR Yaris and GR Corolla has been engineered to provide the turbocharger with a less restrictive supply of air, improving response and allowing peak boost to be achieved earlier in the RPM range.
Our development objective was clear: increase the available air volume while maintaining a smooth, laminar airflow path. Achieving both required a complete redesign of the factory turbo inlet, carefully balancing increased capacity with optimised flow characteristics.
Following extensive development and testing, we increased the internal volume of the turbo tube from 1,300cm³ to 2,200cm³ — an increase of almost 70%. Much of this gain comes from the lower section of the tube around the critical bend leading into the turbocharger. The OEM component is particularly restrictive in this area, whereas our redesigned geometry creates a significantly larger air reservoir immediately before the turbo. This encapsulated volume of air allows the turbocharger to draw from a less restrictive source, reducing wastegate duty cycle and delivering a noticeably sharper throttle response.
The primary tube is manufactured from prepreg carbon fibre, providing exceptional rigidity to eliminate the possibility of deformation under the vacuum generated by the turbocharger. It connects seamlessly to a bespoke nitrile elbow, which mates to a precision CNC-machined aluminium flange that bolts directly to the turbo.
Designed with future upgrades in mind, the system features a modular CNC-machined flange. This allows compatibility with larger hybrid turbochargers by simply replacing the flange, with alternative options available separately.
Performance
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Independently dyno tested at Limit+1, our turbo tube shows gains at the wheels of 14whp and 19ft-lb in the lower rpm range which is a result of the larger volume of immediate air available in the tube. At the higher rpm there are gains of 9whp and 9ft-lb. The tube was tested on a GR Corolla which already had an Eventuri intake installed. The only difference between runs was the turbo tube. |
Product Details
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Part Numbers:
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The Eventuri GR4 Carbon Turbo Tube consists of a number of components engineered to perform a specific purpose and fabricated to the highest of standards. We use 100% pre-preg carbon fiber 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 Turbo Tube Set consists of:
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CARBON FIBER TURBO TUBE The main tube body is crafted from prepreg carbon fiber. This allows the inside to be smooth which helps maintain laminar flow. The tube incorporates an OEM style mount to secure it to the engine as well as the breather ports for a plug and play installation. |
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COMPARISON WITH OEM When comparing the 2 tubes side by side, the most significant increase in volume can be seen at the elbow which leads to the turbo. The OEM tube is heavily restricted in this region and this leads to a choking effect, particularly at higher boost levels. In contrast, our tube has been enlarged significantly in this region while at the same time we have optimised the bend radius for a smoother flow path to the turbo. The result is a two fold increase in the availability of encapsulated air which improves throttle response. Furthermore with less restriction, peak boost can be reached sooner. As can be seen, the increase in volume from 1,300cm³ to 2,200cm³ represents an increase of almost 70%. |
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COMPARISON WITH OEM This diagram shows an overlay of the Eventuri turbo tube with the scan data of the OEM tube inside it. The OEM tube is in a brass colour and the Eventuri tube has been made transparent. You can clearly see the regions where we have increased volumes and improved the flow path. |
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CONNECTING HOSE The carbon tube connects to our custom designed hose made from Nitrile and reinforced with ribs to withstand vacuum forces. This allows for an easier install where the elbow can be installed prior to the carbon tube. This hose provides a smooth internal surface with internal steps to allow for a seamless transition between the carbon and the machined turbo flange. |
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TURBO FLANGE Finally our CNC machined turbo flange secures to the turbo and completes the flow path. This flange can be replaced with alternative versions we will provide separately for larger turbos. |
