Description
Unlock the full potential of your Honda Civic, Civic Type-R, Accord, CR-V, or HR-V turbo with the JB4 Performance Tuner. This plug-and-play solution delivers up to 40hp and 50 lb-ft of torque to the wheels on a stock vehicle—without flashing your ECU or compromising safety.
Plug-and-Play Installation
The JB4 installs easily on two accessible engine bay sensors and works with your factory DME to remap boost, timing, and fueling, improving turbo response and overall performance. With a 64MHz processor sampling sensors 1000 times per second, the JB4 ensures smooth, powerful, and reliable operation. Fuel economy remains unchanged during normal driving, and the tuner is compatible with all driving modes, both manual and CVT transmissions.
Wireless JB4PRO Smartphone Connectivity
Included with your JB4 is the JB4PRO Bluetooth adapter, allowing wireless connection to iOS and Android devices. With the free JB4PRO app, you can:
- Switch between performance maps on the fly
- Record and analyze real-time engine data
- Update JB4 firmware with free upgrades and new maps
- Access advanced log analysis to identify any tuning concerns
The adapter fits fully inside the JB4 enclosure for weather protection and a clean, integrated look.
JB4 Honda Tuner Map Guide
- Map 0: JB4 disabled
- Map 1: +3.5 psi, default, 91+ octane
- Map 2: +4.0 psi, 91-93 octane
- Map 3: +4.5 psi, 93+ octane
- Map 4: +5.0 psi, 30% E85
- Map 5: +6.0 psi, 30% E85 or race fuel
- Map 6: User adjustable custom map
- Map 7: +9.0 psi, 30% E85 or race fuel, full send
- Map 8: VALET / Low boost mode
JB4 Features & Benefits
- Up to 40hp and 50 lb-ft torque gains to the wheels on stock vehicles
- Improves 0-60 and quarter-mile times
- Preloaded with 8 custom Honda maps for various fuels and mods
- Ethanol (E85) compatible maps
- Reads and deletes fault codes
- Monitors up to 40 engine parameters in real time
- Boost-by-gear control for optimal traction in 1st, 2nd, and 3rd gears
- Exhaust flap control where supported
- Full CANbus integration for advanced tuning and safety
- Quick plug-and-play installation
- Smooth, factory-like drivability across all driving modes
- Fuel economy unchanged during normal driving
- 91+ octane required for performance gains
- Not VIN locked and fully removable
- Rugged billet aluminum enclosure
- Designed and assembled in the USA
- 5-year warranty
Vehicle Fitment
Honda:
- 2016-Present 1.5L / 2.0L turbo Honda Civic, Civic Si
- 2017-Present 2.0L turbo Honda Civic Type-R
- 2018-Present 1.5L / 2.0L turbo Honda Accord
- 2017-Present 1.5L turbo Honda CR-V
- 2016-Present 1.5L turbo Honda HR-V
What is a JB4?
The JB4 is a plug-and-play tuner for turbocharged vehicles. It installs between your car’s sensors and ECU, safely adjusting boost, ignition timing, and fuel trims to deliver significant horsepower and torque gains. With advanced CANbus integration, smartphone connectivity, ethanol support, and free firmware updates, the JB4 provides ongoing performance improvements without permanently modifying the ECU.
Is the JB4 a real tune?
Yes. The JB4 uses real-time sensor and CANbus data to optimize performance safely. Gains are comparable to ECU flash tuning but without unlocking or flagging your ECU. Results are smooth, safe, and fully reversible.
