Description
The Burger Tuning JB4 for 2019+ GMC Sierra 1500 2.7L Turbo is the ultimate plug-and-play performance upgrade for your turbocharged Sierra. Delivering up to 85whp and 120wtq to the wheels on a stock truck, the JB4 improves acceleration, towing power, and throttle response—all without the risks or permanence of ECU flashing.
Thanks to CANbus OBDII integration, the JB4 reads and adapts to over 40 real-time engine parameters, including AFR, ignition timing, knock detection, throttle input, gear position, and more, for unmatched precision tuning. Safety features automatically lower boost if the truck overheats, runs lean, knocks, or overboosts, protecting your engine while maximizing performance.
Multiple preloaded maps support 91 octane, 93 octane, E85 mixtures, race gas, and VALET mode, plus boost-by-gear control for improved traction in launches. The JB4 is fully reversible, installs in under an hour with no cutting or splicing, and leaves no trace once removed.
Pair the JB4 with the optional JB4 Mobile or JB4PRO adapters for wireless map switching, data logging, firmware updates, and in-depth performance analysis from your smartphone.
Features & Benefits
- Gains up to +85whp / +120wtq on stock 2.7L Turbo Sierra
- Improves towing performance, 0–60 times, and 1/4 mile results
- Full CANbus OBDII integration for precise tuning and safety monitoring
- 8 preloaded maps for various fuels and mod levels
- Ethanol (E85) compatible tuning maps included
- Boost-by-gear control for optimized launches
- View & record up to 40 engine parameters in real-time
- Read & delete fault codes from your phone
- Compatible with JB4 Mobile and JB4PRO smartphone adapters
- Works with all driving modes, including towing
- Quick Plug & Play installation – no ECU flash needed
- Not VIN-locked – fully removable and resellable
- Includes rugged billet aluminum JB4 enclosure for durability
- Made in the USA – 5-year warranty – free USA shipping
Vehicle Fitment
GMC
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2019+ Sierra 1500 2.7L Turbo
What is a JB4?
The JB4 is the industry-leading plug-and-play tuner for turbocharged vehicles, intercepting and optimizing ECU signals to safely unlock major horsepower and torque gains. Unlike simple “boost chips,” the JB4 uses CANbus data, flex-fuel compatibility, and advanced safety logic to deliver smooth, reliable, and repeatable power increases.
With free firmware updates, a huge enthusiast community, and quick removability, the JB4 has been the gold standard in turbo performance tuning for over a decade—perfect for Sierra owners who want more power without sacrificing reliability.
