Power gains up to 80WHP & 100WTQ on a stock Grenadier without the risks of flashing!
The JB4 tuner for the B58 powered INEOS Grenadier is the most advanced plug & play tuning system available for the 3.0L turbocharged engine platform. Power gains of up to 80 horsepower and 100 lb-ft of torque at the wheels are possible on a completely stock Grenadier running pump gas. Vehicles equipped with bolt-on upgrades, higher octane fuel, E85 mixtures, or larger turbochargers can see even greater gains. Now includes the JB4PRO adapter and free app built in!
No ECU flash required and fully compatible with locked 🔒 ECUs.
The JB4 features a simple plug & play installation harness for fast installation and removal while offering advanced tuning features not available with other tuning systems. These include in-dash map switching between stock and performance maps, optional in-dash boost gauge display, boost limiting by gear for improved traction, progressive water/methanol integration, built-in data logging, fault code reading and clearing, optional electronic wastegate control to prevent throttle closure with exhaust modifications, exhaust flapper control, and many additional features.
Unlike many expensive tuning solutions, the JB4 does not require additional stages or supporting modifications. Simply install the JB4 as your first upgrade and immediately experience improved power delivery, smoother acceleration, and stronger turbo performance.
The JB4 requires no manual setup for basic operation. However users who want to adjust maps, log engine data, or access advanced tuning features can add one of our optional Bluetooth smartphone adapters.
Wirelessly Connect to your JB4: Our all-new JB4 PRO smartphone connection is included to wirelessly connect the JB4 tuner to your Bluetooth 4.0 compatible iOS or Android device. This option allows you to record and analyze vehicle and tuning data, change JB4 performance maps, and update JB4 firmware as we release free newer versions with updates, more powerful maps, and new features under development. Our new adapter fits fully inside the JB4 enclosure for enhanced weather protection and a more streamlined look. The JB4PRO Free app features an intuitive easy-to-use interface, help buttons, and advanced log analysis tools that can estimate the performance of your car and help identify any tuning concerns.Â
For more information about the JB4PRO mobile app click here.
JB4 Map Guide
- Map0: Stock tuning – JB4 disabled
- Map1: +3psi over stock (91 octane)
- Map2: +4psi over stock (91–93 octane)
- Map3: +6psi over stock (93+ octane)
- Map4: +8psi over stock (Race gas or 30% E85)
- Map5: +10psi over stock (Race gas or 30% E85)
- Map6: Custom tuning map
- Map7: Progressive water/methanol map
- Map8: Valet / Low boost mode
JB4 Power Gains, Features & Benefits
- Up to 80hp and 100 lb-ft torque gains on a stock INEOS Grenadier
- Improves 0-60 acceleration and overall vehicle performance
- Preloaded with custom JB4 tuning maps for various fuels and modifications
- E85 and ethanol blend compatible tuning maps
- Read and clear diagnostic fault codes
- View and log up to 40 engine parameters in real time
- Boost-by-gear control for improved traction
- Compatible with JB4 Mobile and JB4PRO smartphone apps
- Advanced CANbus OBDII integration
- Smooth factory-like drivability
- Compatible with all factory driving modes
- No change to fuel economy during normal driving
- 91 octane fuel or higher recommended for performance maps
- Not VIN locked and easily removable for resale
- Includes rugged billet aluminum JB4 enclosure
- Designed and assembled in the USA
- 5-year warranty
Vehicle Fitment
INEOS Grenadier
- 2023+ INEOS Grenadier 3.0L B58 SUV
- 2023+ INEOS Grenadier Quartermaster 3.0L B58 Pickup
What is a JB4?
The JB4 is a plug & play performance tuner for turbocharged vehicles. It installs between engine sensors and the factory ECU allowing it to safely manipulate boost pressure, ignition timing, and fueling for substantial horsepower gains while maintaining factory safety systems.
The JB4 stands apart from other tuning systems through advanced CANbus integration, smartphone connectivity, ethanol compatibility, and continuous firmware updates that expand functionality and performance over time.
The JB4 system is not VIN locked and can easily be transferred to another vehicle or resold later. The JB4 has been the gold standard in plug-and-play turbocharged tuning for more than a decade and is used by enthusiasts in over 67 countries worldwide.
Is the JB4 a real tune?
Yes. The JB4 actively adjusts boost pressure, ignition timing, air-fuel ratios, and fuel trims using real-time engine data through its CANbus connection. This allows the JB4 to deliver performance gains comparable to ECU flash tuning while retaining factory safety systems and without permanently modifying the ECU.
Stock vs JB4 Dyno Results
