Description
Unleash the full performance potential of your 2016+ Ford Focus RS or ST with the JB4 Tuner by Burger Motorsports. This advanced plug-and-play tuning solution delivers power gains of up to 50whp and 60wtq on a stock vehicle while retaining smooth drivability and factory-like reliability.
The JB4 interfaces with your vehicle’s sensors and ECU to dynamically remap boost pressure, timing, and fueling. With a powerful 64 MHz processor, the system samples engine parameters 800 times per second via 10-bit digital-to-analog converters, ensuring precise performance tuning and reduced turbo lag.
Unlike traditional performance chips, the JB4 features full CANbus integration, allowing it to monitor critical engine data including throttle position, gear, air/fuel ratio, fuel trims, ignition advance, knock detection, and more. It also includes failsafe functions such as temperature-based boost control, lean condition protection, and overboost safeguards.
Easily select from preloaded maps via the BMS Data Cable or wirelessly through the JB4 Mobile App or the new JB4PRO Adapter. With options for 91, 93 octane, and E85 fuel blends, this tuner adapts to your performance needs—whether you're running stock or with bolt-on modifications.
Installation is straightforward and fully reversible, leaving no trace when removed. The JB4 is compatible with all factory driving modes, does not alter fuel economy under normal driving, and is covered by a 5-year warranty.
Key Features:
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Gains up to 50whp / 60wtq on stock engines
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Plug-and-play installation — fully reversible
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Advanced CANbus OBDII integration
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Supports ethanol (E85), 91 & 93 octane fuels
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Preloaded with up to 8 tuning maps
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Compatible with JB4 Mobile and JB4PRO App
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On-the-fly map switching, fault code reading/clearing
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Real-time logging of up to 40 parameters
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Boost-by-gear control for optimized traction
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Retains full factory drivability and safety systems
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Rugged billet aluminum enclosure
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Made in the USA | 5-Year Warranty
Vehicle Fitment:
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2016+ Ford Focus RS
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2016+ Ford Focus ST
What is JB4?
The JB4 is a sophisticated tuning system designed for turbocharged vehicles. Installed between your vehicle's sensors and ECU, it allows dynamic and customizable tuning with advanced capabilities like CANbus control, Bluetooth connectivity, spark/fuel control, and on-the-fly tuning adjustments. Unlike flash tunes, the JB4 can be removed without a trace, is not VIN-locked, and continues to receive free firmware and map updates—making it one of the most flexible and powerful tuning options on the market.
