B6A Nissan Z (RZ34) Port Injection Kit (Plug and Play)

B6A VR30 PORT INJECTION KIT
COMPLETE PLUG AND PLAY FUELING SOLUTION WITH FLEX FUEL

The B6A VR30 Port Injection Kit is a fully engineered, in house developed fueling system designed to eliminate the limitations of direct injection on the VR30 platform. This is the exact setup we design, run, and validate internally with proven success on both stock turbo and high power ethanol builds.

As power demands increase, the factory direct injection system becomes the limiting factor. Fuel pressure ceilings, injector duty cycle limits, and heat related knock make DI only setups increasingly restrictive. Port injection removes those constraints and allows the VR30 to scale safely, consistently, and predictably.

This kit is built as a true plug and play solution and includes everything required to add port injection and flex fuel capability without custom fabrication, wiring, or additional sourcing.

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WHY PORT INJECTION ON THE VR30

Port injection fundamentally changes how the VR30 is fueled. By delivering fuel upstream of the intake valves, the system provides greater cooling, improved combustion stability, and dramatically increased fueling headroom compared to direct injection alone.

Key advantages over DI only setups

• Ability to run much higher ethanol content including full E85 with margin
• Substantially increased knock resistance enabled by higher ethanol capability
• Improved cylinder and intake charge cooling under boost
• Increased power potential with safer, more stable combustion
• No need to calculate ethanol blends at the pump to stay within DI limits
• Continuous cleaning of intake valves and elimination of carbon buildup
• Stable fueling across the entire RPM and load range
• Freedom to scale turbo size and boost without chasing fuel pressure

With port injection in place, direct injection becomes supplemental rather than the primary fuel source.

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WHY THIS BENEFITS STOCK TURBO CARS TOO

Port injection is not only for big turbo builds. Even on stock turbos, the VR30 is heavily limited by heat and knock rather than airflow.

By offloading a portion of fueling from the direct injectors to the port injectors, dual injection reduces in cylinder temperature and combustion pressure spikes that typically force conservative ignition timing on DI only setups.

This results in

• Lower combustion temperatures
• Reduced knock sensitivity
• More stable lambda control
• Smoother torque delivery

On stock turbo cars, this allows the engine to operate closer to optimal combustion conditions rather than being knock limited.

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DUAL INJECTION AND MBT TIMING

Maximum Brake Torque timing is the ignition timing point where the engine produces the most torque for a given load. On DI only VR30 setups, MBT is rarely achieved at higher loads because knock forces timing to be pulled before MBT is reached.

Dual injection changes this.

Port injected fuel vaporizes earlier, cooling the intake charge and reducing in cylinder temperature during compression. This slower, more controlled burn allows the tuner to safely add ignition timing closer to true MBT without knock intervention.

The result is

• More ignition timing without increased risk
• Higher torque at the same boost level
• Increased power without added stress
• Improved repeatability in hot conditions

Even at the same boost pressure, engines running dual injection consistently produce more power because they are no longer knock limited.

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INTEGRATED FLEX FUEL CAPABILITY

This kit includes a full flex fuel system with ethanol content sensor and filtration, fully integrated into the port injection setup.

Flex fuel integration allows the ECU to automatically adjust fueling and ignition based on real time ethanol content. This removes the need to manually calculate blends, guess ethanol percentages, or limit fueling to stay within DI constraints.

Benefits of included flex fuel

• Seamless transition between pump gas and high ethanol blends
• Real time ethanol compensation for fuel, timing, and safety
• Consistent performance regardless of fuel variability
• Maximum use of ethanol’s knock resistance and cooling benefits

Flex fuel is not optional here. It is built into the system.

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COST COMPARISON

A typical high power DI only setup requires a high pressure fuel pump upgrade, larger direct injectors, and a separate flex fuel system with sensor and filter. That approach commonly exceeds six thousand dollars while still retaining the inherent limitations of direct injection.

The B6A VR30 Port Injection Kit delivers substantially more fueling capability at a cheaper price point, with fewer compromises, greater reliability, and significantly more headroom.

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WHAT IS INCLUDED

This is a complete system engineered for performance, durability, and OEM quality integration.

Included in the kit

• CNC machined billet port injection manifold
• CNC machined billet fuel rails
• Injector Dynamics injectors sized for high power ethanol applications
• AN fittings and braided AN fuel lines
• All required mounting hardware
• Dedicated port injection wiring harness
• Motiv Reflex + Controller
• Motiv Fuel Pressure Sensor
• Flex fuel ethanol content sensor and in-line filter
• Clean routing with factory quality fitment

Nothing else is required for installation.

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APPLICATIONS

Compatible with ALL VR30DDTT equipped vehicles

Ideal for

• Stock turbo cars seeking safer power and consistency
• E85 and high ethanol content builds
• Big turbo and upgraded turbo setups
• Drag racing and high boost street cars
• Owners who have exceeded the limits of direct injection or want to build for the future

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SUMMARY

The B6A VR30 Port Injection Kit is not an accessory. It is a complete fueling solution that removes the VR30’s biggest bottleneck at every power level. Higher ethanol capability, cooler cylinders, increased knock resistance, cleaner valves, true MBT timing, and integrated flex fuel control all result in more power with less risk.

Direct injection reached its limit.
Dual injection moves the platform forward.

Designed, tested, and proven in house by B6A.