Honda B-Series Billet Aluminium Complete ITB Assembly – Proven Race Performance Upgrade

HONDA B-SERIES BILLET ALUMINIUM COMPLETE ITB ASSEMBLY

Original Velocity Race Innovations (VR) Product – Made in Malaysia

 

The Honda B-Series Billet Aluminium Complete ITB Assembly is a performance-oriented Individual Throttle Body (ITB) system designed specifically for Honda B-Series engines. This complete ITB assembly is developed for performance applications where improved throttle response, precise throttle control and optimised intake airflow are important.

 

Unlike a conventional intake system that uses a shared plenum and single throttle body, an Individual Throttle Body setup provides a dedicated throttle body for each cylinder. This configuration is particularly suitable for naturally aspirated Honda B-Series engines, high-RPM builds, track cars, race cars and other performance applications.

 

The Honda B-Series Billet Aluminium Complete ITB Assembly is available in 45 mm, 50 mm and 55 mm throttle body sizes, allowing the configuration to be selected according to the engine displacement, cylinder-head flow, camshaft specification, RPM range and overall engine setup.

 

The Honda B-Series Billet Aluminium Complete ITB Assembly is developed for Honda B-Series engine builds where the intake system needs to complement a performance-focused engine combination. By using individual throttle bodies, each cylinder is provided with its own throttle opening, creating a direct throttle-control arrangement that differs from a conventional single-throttle-body intake manifold.

 

This makes the Honda B-Series Billet Aluminium Complete ITB Assembly a suitable choice for naturally aspirated B-Series engines that are being developed around responsive throttle characteristics, higher engine speeds and performance-oriented intake airflow.

 

Designed, engineered and manufactured in Malaysia by Velocity Race Innovations.

 

 

COMPATIBILITY

The Honda B-Series Billet Aluminium Complete ITB Assembly is designed for various Honda B-Series engine applications, including:

• Honda B16
• Honda B18
• Honda B20
• Naturally aspirated B-Series builds
• High-compression B-Series engines
• High-RPM B-Series builds
• Track applications
• Race applications
• Drag applications
• Motorsport applications
• Custom ECU setups
• Standalone ECU setups

 

Honda B-Series engines are available in different configurations. Fitment can depend on the specific engine code, cylinder-head configuration and overall intake setup.

 

Please provide your exact engine code and cylinder-head specification when ordering so we can confirm the correct configuration for your application.

 

 

FEATURES & BENEFITS

The Honda B-Series Billet Aluminium Complete ITB Assembly is designed with a performance-focused intake configuration and includes the following features:

• Complete Individual Throttle Body assembly
• Designed for Honda B-Series engines
• Individual throttle body for each cylinder
• CNC-machined billet aluminium construction
• Available in 45 mm, 50 mm and 55 mm sizes
• Lightweight and rigid construction
• Precise throttle operation
• Direct throttle control
• Performance-oriented intake design
• Suitable for naturally aspirated performance builds
• Suitable for high-RPM applications
• Suitable for track, race and drag applications
• Manufactured in Malaysia by Velocity Race Innovations

 

An ITB system can provide a sharper and more direct throttle response compared with a conventional shared-throttle intake system, depending on the complete engine combination and ECU calibration.

 

 

MATERIAL & FINISH

The Honda B-Series Billet Aluminium Complete ITB Assembly is manufactured using precision CNC-machined billet aluminium components.

 

The billet aluminium construction provides:

• Strong and rigid construction
• Accurate CNC-machined dimensions
• Consistent throttle operation
• Lightweight performance-oriented design
• Clean engine-bay appearance
• Suitable construction for performance applications

 

Velocity Race Innovations manufactures performance automotive components using CNC machining and engineering processes developed for automotive and motorsport applications.

 

 

OPTIONS AVAILABLE

The Honda B-Series Billet Aluminium Complete ITB Assembly is available in three throttle body sizes:

• 45 mm
• 50 mm
• 55 mm

The available 45 mm, 50 mm and 55 mm configurations provide flexibility for different Honda B-Series engine combinations. Smaller throttle body diameters can be considered for applications prioritising response and drivability, while larger configurations may be more appropriate for engines designed to operate at higher RPM and with increased airflow requirements.

 

 

PACKAGE INCLUDES

• 1 × Complete Velocity Race Honda B-Series Billet Aluminium ITB Assembly
• Selected 45 mm / 50 mm / 55 mm ITB configuration
• Required assembly components as supplied with the selected configuration

 

 

IMPORTANT NOTE

The Honda B-Series Billet Aluminium Complete ITB Assembly is an aftermarket performance component manufactured by Velocity Race Innovations and is not an OEM Honda component.

 

Honda B-Series engines can have different cylinder-head and intake configurations. Customers should provide the exact engine code and cylinder-head specification before ordering so the correct fitment can be confirmed. The final performance result will also depend on the complete engine combination and ECU calibration.

 

 

INSTALLATION

Professional installation is recommended for the Honda B-Series Billet Aluminium Complete ITB Assembly. Installation may require proper adjustment and setup of the throttle linkage, throttle position sensor and individual throttle bodies.

 

After installation, the throttle bodies should be properly synchronised and the ECU should be calibrated according to the engine configuration.

 

Depending on the application, the installation may also require suitable:

• Throttle Position Sensor
• Air Temperature Sensor
• Fuel Injectors
• Fuel Rail
• Intake Trumpets / Velocity Stacks
• Airbox
• Programmable ECU
• Standalone ECU

 

Proper throttle synchronisation and ECU tuning are important to achieve correct idle quality, throttle response and overall engine operation.

 

The Honda B-Series Billet Aluminium Complete ITB Assembly can be used as part of a complete naturally aspirated performance engine package. It can complement other modifications such as performance camshafts, cylinder-head work, increased compression, upgraded valve train components and a suitable exhaust system. When these components are correctly matched, the intake system becomes part of the overall airflow strategy of the engine rather than functioning as an independent modification.

 

 

WHY UPGRADE TO ITB?

The Honda B-Series Billet Aluminium Complete ITB Assembly provides each cylinder with its own individual throttle body rather than using a single throttle body connected to a shared intake plenum.

 

This configuration is commonly used for performance-oriented naturally aspirated engines where direct throttle response and individual-cylinder airflow are important.

 

Potential benefits of an ITB setup include:

• Sharper throttle response
• More direct throttle control
• Improved engine response
• Stronger intake airflow at high RPM
• Enhanced intake sound
• Greater tuning flexibility
• Suitable for high-RPM naturally aspirated applications

 

However, an ITB system should be considered as part of the complete engine combination. The final result depends on the engine specification, throttle body size, intake design and ECU calibration.

 

 

PERFORMANCE NOTES

The Honda B-Series Billet Aluminium Complete ITB Assembly does not automatically guarantee a specific horsepower increase.

 

Actual performance depends on the complete engine setup, including:

• Engine displacement
• Compression ratio
• Cylinder-head flow
• Camshaft specification
• Valve train
• Exhaust system
• Fuel system
• Injector sizing
• Ignition system
• ECU
• Engine RPM range
• ITB diameter
• Intake trumpet / velocity stack configuration
• ECU calibration

 

Choosing a larger throttle body does not necessarily result in more power. The ITB diameter should be matched to the engine’s airflow requirements and intended operating range. For best results, the complete engine combination should be properly configured and professionally tuned after installation.

 

One of the main characteristics of an ITB system is the direct throttle response it can provide. With an individual throttle body positioned for each cylinder, the throttle system operates differently from a conventional intake manifold with a shared plenum.

 

For a properly developed naturally aspirated B-Series engine, this can contribute to a responsive and engaging throttle characteristic. The actual result will vary according to the engine’s mechanical specification and ECU calibration.

 

 

VELOCITY RACE QUALITY

Velocity Race Innovations (VR) is a Malaysian motorsport engineering and performance-parts manufacturer specialising in CNC machining, fabrication, CAD engineering and performance automotive components.

 

The Honda B-Series Billet Aluminium Complete ITB Assembly is designed with a focus on accurate manufacturing, practical fitment and performance-oriented applications.

 

Our components are developed and manufactured in Malaysia for automotive enthusiasts, performance builds and motorsport applications.

 

Original Velocity Race Product – Made in Malaysia

Designed for Performance. Built for Motorsport.

 

 

APPLICATION & UPGRADE POTENTIAL

The Honda B-Series Billet Aluminium Complete ITB Assembly is suitable for Honda B-Series engines being developed for:

• Naturally aspirated performance
• High-RPM applications
• Track use
• Race applications
• Drag applications
• Motorsport projects
• Performance street builds

 

The ITB system can also form part of a larger naturally aspirated engine package together with:

• Performance camshafts
• Cylinder-head upgrades
• High-compression pistons
• Valve train upgrades
• Performance exhaust systems
• Fuel-system upgrades
• Programmable ECU
• Standalone ECU
• Intake trumpets / velocity stacks
• Airbox systems
• Professional ECU tuning

 

The correct combination of engine specifications, ITB diameter and ECU calibration is important when developing a performance-oriented Honda B-Series engine. For customers planning a complete Honda B-Series performance build, the Honda B-Series Billet Aluminium Complete ITB Assembly provides a dedicated individual-throttle-body solution that can be integrated with the engine’s fuel, ignition and ECU systems.

 

For exact fitment, available configurations or custom requirements, customers can contact Velocity Race Innovations before ordering. Providing the engine code, cylinder-head specification and intended application will help us determine the appropriate setup.

 

Proper tuning is an important part of installing the Honda B-Series Billet Aluminium Complete ITB Assembly. Because the intake configuration differs from a conventional single-throttle-body system, the ECU setup should be reviewed after installation. Throttle synchronisation, TPS calibration, fuel delivery, ignition timing and the selected ECU tuning strategy should be checked to ensure that the engine operates correctly throughout the RPM range.

 

 

WARRANTY / MANUFACTURING DEFECT

1-to-1 exchange for manufacturing defects*.

*Manufacturing defects must be verified by Velocity Race Innovations before a replacement is approved. Damage caused by incorrect installation, modification, misuse, accident or external factors is not considered a manufacturing defect.

 

 

For Honda B-Series and other performance intake solutions, explore the relevant products from Velocity Race Innovations.

For additional technical information about Individual Throttle Bodies, throttle synchronisation and ITB tuning considerations, refer to HP Academy’s technical resources: