Innovators West | Nissan RB "RaceX" Harmonic Damper

Innovators West Race Extreme (RACEX) Harmonic Balancer – Nissan RB

Part Number: RBMP-RACEX

Take crankshaft control to the next level with the Innovators West Race Extreme (RACEX) Harmonic Balancer, engineered specifically for high-performance Nissan RB engine combinations using the larger 35mm crankshaft snout found on Callies crankshafts.

Correct harmonic balancer fitment is critical in any serious engine build. As cylinder pressure, boost and engine speed increase, the crankshaft is subjected to substantial torsional loading, causing it to twist and recover repeatedly during operation.

If these vibrations are not effectively controlled, they can place additional stress on the crankshaft, bearings, timing components and rotating assembly.

The Innovators West RACEX uses the company’s proven spring-loaded inertia ring and wet-friction clutch damping technology to absorb and control crankshaft torsional vibration across a broad operating range.

Internal fluid lubricates the damping components while also assisting with heat transfer into the outer housing, helping maintain consistent damping performance in demanding competition environments.

Designed specifically around the 35mm Callies RB crankshaft snout, the RACEX is the correct balancer solution for builders moving beyond the standard Nissan crankshaft configuration.

Features & Benefits

• Innovators West Race Extreme (RACEX) model
• Designed specifically for Nissan RB engines
• Suits the 35mm crankshaft snout used on Callies crankshafts
• Developed for high-performance and competition applications
• Helps control crankshaft torsional vibration
• Spring-loaded inertia ring damping system
• Wet-friction clutch technology
• Internal fluid lubrication
• Internal fluid assists with damping-system heat transfer
• Designed for demanding high-RPM and high-cylinder-pressure applications
• Allows custom accessory-drive configuration
• Supplied without accessory belt pulleys

Technical Specifications

• Product Type: Harmonic Balancer
• Brand: Innovators West
• Model: Race Extreme (RACEX)
• Part Number: RBMP-RACEX
• Engine Family: Nissan RB
• Crankshaft Application: Callies
• Crankshaft Snout Diameter: 35mm
• Damping System: Spring-Loaded Inertia Ring / Wet-Friction Clutch
• Accessory Pulleys Included: No
• Application: High-Performance / Competition

What’s Included

• 1 × Innovators West Race Extreme (RACEX) Harmonic Balancer

Pulleys & Accessory Drive

The RACEX harmonic balancer is supplied without accessory-drive pulleys, allowing the engine builder to configure the front accessory system to suit the individual combination.

For engines running an alternator and mechanical water pump, the matching water pump / alternator pulley is required.

For combinations retaining power steering, the matching power-steering pulley is also available separately.

Available Separately

• Water Pump / Alternator Pulley
• Power Steering Pump Pulley

Applications

• Nissan RB performance engines
• RB26 race-engine combinations
• RB30-based performance engines where compatible
• Engines using Callies crankshafts
• 35mm crankshaft snout applications
• High-horsepower turbocharged RB engines
• Drag racing applications
• Circuit and competition engines
• High-RPM race builds

Why Harmonic Control Matters

A crankshaft does not simply rotate as one rigid component.

Every combustion event applies torque to the crankshaft, causing it to twist and rebound. At high power and RPM, these torsional movements can become increasingly severe and may contribute to increased stress on bearings, crankshafts and other rotating components.

A properly matched harmonic balancer helps absorb and manage these torsional vibrations, reducing the amount of damaging energy transferred through the rotating assembly.

For high-output RB combinations, effective harmonic control becomes increasingly important as boost, cylinder pressure and engine speed rise.

Innovators West Wet-Friction Technology

Innovators West dampers use a combination of spring-loaded inertia rings and wet-friction clutch technology to control torsional crankshaft vibration.

Internal fluid lubricates the damping components while helping move heat into the outer housing. This allows the damper to respond across a wide RPM range rather than being tuned around a narrow operating window.

The result is a damping system designed for the broad and demanding operating conditions seen in serious performance and competition engines.

Important Fitment Note

The RBMP-RACEX is designed specifically for the 35mm crankshaft snout used on PRP-supplied Callies Nissan RB crankshafts.

It is not intended for the standard Nissan RB 30mm crankshaft snout.

For engines using the factory-style 30mm crankshaft snout, select the Innovators West Street Extreme (STX) Harmonic Balancer instead.

Always confirm crankshaft snout diameter and front-drive configuration before ordering.

Why Choose Innovators West?

Innovators West has built a strong reputation in high-performance and motorsport applications through its advanced harmonic damper technology and application-specific engineering.

For serious Nissan RB combinations, the RACEX provides a purpose-designed solution for engines using upgraded 35mm Callies crankshafts where standard factory-dimension dampers are no longer suitable.

Why Buy From Prime Speedworks

Prime Speedworks supplies Innovators West harmonic dampers, pulleys, installation tools and supporting components to engine builders, performance workshops, race teams and racers throughout Australia.

Whether you're building a conventional RB combination or a high-end engine, Prime Speedworks can help match the correct damper, accessory pulleys, balancer hardware and installation tooling to your setup.