Up to +75WHp and +79WTq on a Stock Infiniti QX80

Unlock the true performance potential of your 2025+ Infiniti QX80 equipped with the 3.5L VR35DDTT Twin Turbo engine. The JB4 Performance Tuner delivers up to 75 wheel horsepower and 79 wheel torque gains on a completely stock vehicle, dramatically improving acceleration, throttle response, and overall driving excitement.

Engineered as a true plug-and-play system, the JB4 installs discreetly in the engine bay by connecting to two easily accessible sensors and integrating with your factory ECU via CANbus. Unlike flash tuning, the JB4 does not rewrite or unlock your ECU, meaning your vehicle remains fully removable, unflagged, and factory-safe.

Why Choose JB4 for the Infiniti QX80?

The JB4 works alongside your factory ECU tuning to intelligently remap:

• Boost pressure

• Ignition timing

• Fuel delivery

• Turbo response

The result is stronger mid-range torque, reduced turbo lag, and smoother power delivery across the entire RPM range — all while maintaining factory drivability and fuel economy during normal driving.

Compatible with all factory drive modes.

Advanced CANbus Integration (What Sets JB4 Apart)

Unlike basic performance chips, the JB4 features full CANbus OBDII integration, allowing it to read and process critical engine data directly from the ECU in real time, including:

• Pedal position

• Throttle position

• Timing advance

• Fuel trims

• Air/fuel ratio

• Engine knock

• Gear position

• And much more

This advanced data processing allows the JB4 to deliver higher power gains safely while continuously adapting to operating conditions.

Preloaded Maps for Multiple Fuel Types

The JB4 comes preloaded with multiple tuning maps, including:

• 91 octane

• 93 octane

• E85 mixtures

• Unleaded race gas

• Factory / bypass map

Up to 8 maps are available depending on setup and modifications.

JB4 Features & Benefits

• Up to +75whp and +79wtq on a stock QX80

• Improved 0–60 and ¼ mile times

• Ethanol (E85) compatible tuning maps

• Boost by gear control (1st–3rd) for optimized launches

• Read and delete diagnostic trouble codes

• Monitor and log up to 40 engine parameters in real time

• Compatible with the FREE JB4PRO smartphone app

• Exhaust flap control (in supported applications)

• Rugged billet aluminum JB4 enclosure

• Not VIN locked – fully removable and transferable

• Fuel economy unchanged during normal driving

• Requires 91 octane or higher for performance gains

• Designed and assembled in the USA

• Backed by a 5-year warranty

Installation

• Quick plug-and-play setup

• Discreet engine bay installation

• No ECU unlocking

• Fully reversible without trace

Vehicle Fitment

• 2025+ Infiniti QX80 3.5L V6 Twin Turbo (VR35DDTT)

What is JB4?

The JB4 is an advanced plug-and-play performance tuning system for turbocharged vehicles. It installs between engine sensors and the factory ECU, dynamically adjusting boost, timing, and fueling in real time.

Unlike ECU flash tunes, the JB4:

• Does not permanently modify factory software

• Retains factory safety systems

• Is removable and resellable

• Receives free firmware and mapping updates

With over a decade of development and global use, the JB4 remains the benchmark for plug-and-play turbocharged performance tuning.