Description
Unlock the hidden performance in your Kia or Hyundai 1.6L Smartstream Turbo with the JB4 Plug-and-Play Performance Tuner. Engineered to deliver gains of up to 40 horsepower and 60 lb-ft of torque to the wheels on a stock vehicle, the JB4 enhances boost, timing, and fueling while working seamlessly alongside your factory ECU for powerful yet safe performance improvements.
Designed far beyond a basic performance chip, the JB4 features advanced CANbus integration that monitors pedal input, throttle position, engine speed, gear selection, ignition timing, air/fuel ratios, fuel trims, knock control, and more to optimize performance in real time. The result is reduced turbo lag, improved acceleration, stronger mid-range power, and enhanced driving response.
The included JB4PRO wireless adapter and free smartphone app allow Bluetooth connectivity to compatible iOS and Android devices, enabling on-the-fly map changes, data logging, fault code reading and clearing, firmware updates, and advanced performance analysis. Multiple tuning maps support 91 octane, 93 octane, and E85 blends, while stock and valet modes provide added flexibility.
Built-in safety strategies help protect your engine by controlling boost until oil and coolant reach operating temperature, and automatically reducing boost in the event of overheating, lean conditions, excessive knock, or overboost situations. Fuel economy remains unchanged during normal driving, and compatibility with all factory driving modes ensures OEM-like drivability.
Features and Benefits
- Up to 40 wheel horsepower and 60 lb-ft torque gains on stock vehicles
- Plug-and-play installation with no permanent modifications
- Reduces turbo lag and improves throttle response
- Multiple performance maps for pump gas and E85 blends
- Default Map 1 runs 4 PSI over stock peak boost
- Full CANbus integration for advanced tuning control
- Read and clear diagnostic fault codes
- Logs up to 40 engine parameters
- Boost by gear control for improved traction
- Exhaust flap control on supported vehicles
- JB4PRO Bluetooth adapter included
- Free smartphone app included
- Wireless map switching and firmware updates
- Retains factory safety systems and drivability
- Supports all factory drive modes
- No impact on normal fuel economy
- Requires 91 octane or higher for performance maps
- Fully removable and not VIN locked
- Billet aluminum enclosure included
- Designed and assembled in the USA
- Backed by a 5-year warranty
Smartstream Sensor Identification
- This JB4 fits vehicles equipped with white Smartstream sensors (JB4 V2)
- Vehicles with black Lambda sensors require JB4 V1
⚠️ ATTENTION: Does my 1.6L Turbo use a Smartsteam® (JB4 V2) or Lambda (JB4 V1)?
The Lambda sensor is black and the Smartstream sensors are white. If your sensor is white you use this JB4 on this page.
Vehicle Fitment
Kia
- 2019+ Kia K5 1.6L Smartstream Turbo 4-Cylinder
Hyundai
- 2022+ Hyundai Santa Cruz 1.6L Smartstream Turbo 4-Cylinder
- 2022+ Hyundai Kona 1.6L Smartstream Turbo 4-Cylinder
- 2021+ Hyundai Elantra 1.6L Smartstream Turbo 4-Cylinder
- 2020+ Hyundai Sonata 1.6L Smartstream Turbo 4-Cylinder
What is a JB4?
The JB4 is a plug & play tune available for turbocharged vehicles. The JB4 tuner installs between your car's sensors and its DME/ECU (computer) and manipulates vehicle performance through these connections making your vehicle much faster. While it's not the only tuning system that operates this way the JB4 separates itself from the competition with much more advanced connection points and processing including CANbus, fuel & spark control, Bluetooth to your smartphone, and a variety of innovative and advanced features not possible with any other system. BMS regularly publishes free mapping and firmware updates adding performance and features as ongoing development allows. In addition, the JB4 system is not VIN-locked to your vehicle and can quickly be removed and swapped between cars or resold at a later time. Often imitated but never duplicated the JB4 has been the gold standard in plug and play turbocharged performance tuning for over a decade and is sold in over 67 countries worldwide.
Is the JB4 a real tune?
Yes the JB4 is a real tune. By tapping into specific sensors and CANbus for real time vehicle data the JB4 is able to alter your boost, timing, AFR, and/or fuel trims, to a similar degree an ECU reflash would, but without the vehicle ever knowing its been tuned. The result is safe, smooth, and significant power and torque gains while retaining your factory safety systems and without having to unlock/flag your ECU.
The JB4 remains one of the most advanced and proven plug-and-play turbo tuning systems available, combining power, safety, and unmatched functionality for enthusiasts seeking serious performance without compromising reliability.
