Lexus RC/IS/GS/NX JB4 Tuner

This plug and play tuner attaches to easy to access sensors in your Lexus engine bay and works with your factory DME tuning to remap your boost, timing, and fueling for optimal performance and reduced turbo lag. It features a 64mhz processor allowing sensors to be sampled 800 times per second using dedicated 10 bit digital to analog converters, ensuring smooth and powerful performance.

Power gains are up to 45 crank horsepower and up to 45 crank torque over stock, at the default map1 setting. With race gas or E85 mixtures, higher power gains are possible. Boost is adjustable using a BMS Data Cable or Bluetooth adapter. Includes fully OBDII based CANbus operation for unrivaled tuning performance, features, and functionality.

Installation is very discrete and it quickly removes without a trace when needed. Fuel economy during normal driving is unchanged.

Wirelessly connect the JB4 to your Bluetooth 4.0 compatible iOS and Android device via the JB4 Mobile connect kit, or to your Windows laptop with the BMS data cable. Both options allow 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. A separate JB4 Mobile app purchase is also required.

JB4 Features & Benefits

• Increases horsepower/torque making your Lexus faster

• Improves 0-60 times and 1/4 mile times

• Preloaded with custom JB4 tuning software and up to 8 maps for various fuel and modification levels

• Ethanol (E85) compatible tuning maps

• Able to read/delete fault codes

• View and record up to 40 different gauges/engine parameters in real-time with the JB4 app.

• Boost by gear in 1st, 2nd, and 3rd can be controlled via the JB4 app for a perfect launch

• Compatible with JB4 Mobile for smartphone logging, tuning changes, and adjustment

• The JB4 offers a lot more performance, functionality, and safety than your average performance chip

• Quick Plug & Play Installation

• CANbus OBDII integration offering unrivaled tuning features and performance

• Improved performance over non-integrated chip tunes

• Runs as smoothly as stock, this is how your vehicle should have come from the factory

• Compatible with all driving modes

• Fuel economy unchanged during normal driving

• Premium 91 octane fuel or better required for performance gains

• Not VIN locked and can be removed without a trace and resold down the road

• Includes the rugged JB4 billet aluminum enclosure for protection

• Made in the USA

• 5 Year warranty

Vehicle Fitment

• 2016-Present Lexus RC 200t

• 2016-Present Lexus IS 200t

• 2016-Present Lexus GS 200t

• 2016-Present Lexus IS 300t

• 2016-Present Lexus NS 200t

• 2015-Present Lexus NX 200t

• 2018-Present NX 300

 

DYNO RESULTS

2016 Lexus IS 200t stock vs. BMS JB4 tune, default settings

 

JB4 Install Video

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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.

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