Infinity Design Honda Civic Type R FK8 Intake

The Infinity Design Honda Civic Type R FK8 Intake System is engineered to improve airflow, increase engine performance, and enhance throttle response on the turbocharged 2.0L Honda Civic Type R FK8. Designed to overcome the airflow restrictions of the factory intake system, this high-performance intake features a redesigned intake duct, increased internal volume, a large-capacity air filter, and an optimized carbon fiber intake tube.

The factory FK8 intake system incorporates restrictive airflow passages and noise-reduction features that can limit airflow, particularly on modified and highly tuned vehicles. The Infinity Design intake addresses these limitations by providing a more direct and efficient airflow path, allowing the engine to breathe more effectively as airflow demands increase.

Developed using Computational Fluid Dynamics (CFD), extensive dyno testing, and data logging, the Infinity Design intake has been independently tested by Tegiwa Imports and TPW Engineering. Testing demonstrated significant performance improvements, including reported gains of up to 18 BHP and 15 lb-ft of torque on stock vehicles, and up to 26 BHP and 30 lb-ft of torque on tuned vehicles, alongside improved throttle response and a more pronounced induction sound.

The system incorporates the largest air filter available for the FK8 platform, providing the airflow capacity required for both standard and highly modified applications.

Advanced Intake Design

The Infinity Design FK8 intake features a completely redesigned intake duct with a larger front opening and increased internal volume. It retains the factory rubber bonnet seal while increasing the cross-sectional area between the front air feed and the air filter.

Unlike the factory intake, which forces incoming air through a 90-degree bend followed by a 180-degree turn before reaching the panel filter, the Infinity Design system uses a more direct airflow path. Air reaches the filter with less than a 45-degree change in direction before entering the intake tube.

This streamlined design reduces unnecessary airflow restrictions and maximizes the available intake volume, helping maintain an adequate air supply as engine airflow requirements increase.

Carbon Fiber Intake Tube

The carbon fiber intake tube features a gradual transition from the large cross-sectional area of the air filter to the smaller diameter required by the factory MAF sensor. This carefully developed shape helps maintain smooth airflow while supporting improved throttle response and overall drivability.

The intake tube is also designed to enhance induction sound. Rather than producing a sharp or abrupt intake noise, its gradual diameter transition creates a deeper, more substantial induction note characteristic of Infinity Design intake systems. The megaphone-like internal profile helps shape and amplify the sound produced by the intake.

The MAF sensor and breather housings are integrated directly into the carbon fiber intake tube, creating a stronger, more cohesive design with a clean appearance. The intake also complements the Infinity Design carbon fiber turbo inlet for a coordinated engine bay installation.

A custom EPDM silicone coupler is included to connect the intake tube to the factory turbo inlet. Its specially designed internal profile provides a smooth transition between the larger intake tube and smaller turbo inlet, eliminating an internal step that could otherwise disturb airflow.

Performance Intake Tube Option

The Infinity Design intake system is designed around the factory MAF sensor, allowing the standard intake configuration to be installed and operated without requiring an ECU tune.

For applications requiring increased airflow capacity and an extended MAF operating range, Infinity Design also developed a larger Performance Intake Tube.

Traditionally, increasing the MAF operating range would require upgrading to a Hondata CTR 500 MAF sensor, allowing operation beyond the factory sensor's voltage limits but adding considerable cost. The Infinity Design Performance Intake Tube provides a more cost-effective alternative, offering a 51% increase in cross-sectional area compared to the standard intake tube.

The larger tube provides additional airflow capacity and allows operation beyond the factory MAF voltage range.

The MAF sensor remains centrally positioned within the tube to maintain consistent airflow measurement. However, the increased cross-sectional area changes the relationship between airflow and MAF voltage. Consequently, the MAF calibration must be adjusted, and the Performance Intake Tube configuration requires ECU tuning.

Independent Performance Testing

The Infinity Design FK8 intake was independently tested on two Honda Civic Type R vehicles under controlled dyno conditions.

The first vehicle was completely standard and unmodified, tested using a Maha MSR500 2WD dynamometer. The second vehicle was modified with a sports catalytic converter, cat-back exhaust, intercooler, and ECU tune, and was tested using a Dyno Developments 2WD dynamometer.

Testing was independently conducted by Tegiwa Imports and TPW Engineering, respectively. All reported power figures are measured in brake horsepower (BHP) at the flywheel.

Before testing, both vehicles were brought to operating temperature and fully heat-soaked. Dyno cell temperatures were maintained at approximately 2°C above ambient, with equivalent temperature conditions replicated for both intake configurations to ensure a consistent comparison.

Each intake configuration underwent three consecutive dyno runs using the same testing procedure. The stock vehicle remained completely unmodified apart from the intake system, and all testing was conducted using 99 RON fuel.

Stock Vehicle Dyno Results

The standard Honda Civic Type R FK8 produced a baseline figure of 315 BHP with the factory intake system, matching the vehicle's quoted factory output.

With the Infinity Design intake installed, peak power increased to 329 BHP at 6,500 RPM, representing a measured gain of 14 BHP, accompanied by an increase of 15 lb-ft of torque.

More importantly, the dyno results demonstrated improvements in both horsepower and torque throughout the RPM range, rather than providing gains exclusively at peak power. This means the performance improvements are also available within the engine speeds commonly used during everyday driving.

These gains are attributed to the improved airflow capacity and reduced restrictions of the Infinity Design intake, allowing the turbocharged engine to breathe more efficiently throughout the rev range.

Tuned Vehicle Dyno Results

On the modified and ECU-tuned Honda Civic Type R FK8, the Infinity Design intake delivered even more significant performance improvements.

Dyno testing demonstrated increased horsepower and torque throughout the RPM range, with the largest recorded improvement reaching 28 BHP at 5,400 RPM.

Peak power increased from 335 BHP with the factory intake to 356 BHP with the Infinity Design intake, representing a gain of 21 BHP, alongside an increase of 30 lb-ft of torque.

These improvements are supported by the intake's large air filter and high-volume airbox, which provide greater airflow capacity for engines operating under increased airflow demands.

Filter size and available surface area are particularly important as dirt and debris accumulate during use. As a filter becomes contaminated, airflow restriction increases. A smaller filter is generally more susceptible to becoming restrictive as it collects debris, potentially resulting in greater power losses.

The results demonstrate how the factory intake can become a significant airflow restriction as engine performance and tuning levels increase.

ECU Data Logging

In addition to dyno testing, ECU data logging was performed on a completely standard Honda Civic Type R FK8 without engine modifications.

ECUTEK software was used to monitor engine parameters with both the factory intake and Infinity Design intake installed. The recorded parameters included:

• Wastegate duty cycle.

• Intake air temperatures measured in the inlet manifold.

• Ignition timing.

• Air-fuel ratio.

• Boost pressure.

Wastegate Duty Cycle

Data logging showed that the Infinity Design intake generally operated with a 1–2% lower wastegate duty cycle than the factory intake up to 5,000 RPM.

Above 5,000 RPM, the difference increased, with wastegate duty cycle reducing by approximately 4% compared to the factory intake through to redline.

This demonstrates the intake's ability to improve airflow efficiency and reduce the effort required from the turbocharger's wastegate control system to achieve the desired boost pressure.

Key Features

• Designed specifically for the Honda Civic Type R FK8.

• High-flow intake system engineered to reduce factory airflow restrictions.

• CFD-developed intake design.

• Largest air filter available for the FK8 platform.

• Increased intake duct opening and internal volume.

• More direct airflow path with reduced directional changes.

• High-performance carbon fiber intake tube.

• Integrated MAF sensor and breather housings.

• Gradually tapered intake tube for smooth airflow.

• Enhanced throttle response and induction sound.

• Custom EPDM coupler included for connection to the factory turbo inlet.

• Compatible with the factory MAF sensor in the standard intake configuration.

• No ECU tuning required for the standard intake configuration.

• Optional Performance Intake Tube offering a 51% increase in cross-sectional area.

• Performance Intake Tube requires ECU tuning and MAF recalibration.

• Independently tested by Tegiwa Imports and TPW Engineering.

Vehicle Fitment

Honda

• Civic Type R FK8 – 2017-2021

Fitment Notes:

• Designed specifically for the Honda Civic Type R FK8 platform.

• The standard intake configuration uses the factory MAF sensor and does not require ECU tuning.

• The optional Performance Intake Tube requires ECU tuning and MAF recalibration due to its increased cross-sectional area and altered MAF voltage characteristics.

• The custom EPDM coupler connects the intake tube to the factory turbo inlet.

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