The JB4 plug and play tuner attaches to sensors in the engine bay and works with your factory ECU tuning to remap boost, timing, and fueling for optimal performance and reduced turbo lag. Available for both the 2.0L turbocharged and 3.5L supercharged models, power gains of 60-100hp to the wheels are possible! This is how your Emira should have come from the factory.

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. Separate JB4 Mobile app purchase is also required.

JB4 Features & Benefits

• Power gains up to 100whp depending on fuel used
• Improves 0-60 times and 1/4 mile times
• Preloaded with custom JB4 Emira tuning software and maps 91 octane, 93 octane, race gas, and ethanol blends. 
• Read/delete fault codes from the JB4 app when OBDII cable is attached
• View and record up to 40 different gauges/engine parameters in real-time with the JB4 app when OBDII cable is attached.
• 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
• 91 octane fuel or better is 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

The JB4 tuners are sold by themselves, you will also need a wireless connection kit unless you happen to already have one.  There are two versions of wireless connection devices with details found below. The "PRO" version is the latest version and also cheaper.   

Be sure to select which model tuner you would like and then also which connection kit you would like, you will end up having two items in your cart! 

CLICK HERE FOR THE I4 AMG INSTALL GUIDE 

CLICK HERE FOR THE V6 INSTALL GUIDE 

Vehicle Fitment

Lotus
• 2022+ Lotus Emira 2.0L I4 Turbo (M139)
• 2022+ Lotus Emira 3.5L V6 Supercharged (2GR-FE (Manual 6spd & Auto Cars)

Wirelessly connect and control your JB4 with your phone or tablet!

The JB4 Wireless Bluetooth Connect Kit (Rev 3.7) allows your Bluetooth 4.0 compatible Apple® iOS® and Android® devices to connect wirelessly to your JB4 via the JB4 app. View critical engine data in real time, datalog, read codes, change maps, update settings, update firmware, and more, all wirelessly from the palm of your hand!

The REV3 mounts next to the JB4 in the engine bay eliminating the need to run a BMS DATA cable inside the cabin. It's compatible with all JB4 products. Just plug it in to the JB4 where your BMS DATA cable connects, purchase the JB4 Mobile app (see below), and you're off and running.

Please note the JB4 Mobile app is available for iPhone®, iOS®, or Android® and sold separately via the Apple® or Android® app store on your phone. The wireless adapter is not compatible with the JB4 windows interface. See our other listings for the "BMS DATA cable" for laptop use.

Features & Benefits

• Connect and control your JB4 tuner wirelessly from your phone or tablet
• iPhone® and Android® compatible
• Change JB4 maps
• Read/Delete error codes
• Monitor your vehicle with your choice of over 40 live gauges
• Take logs to tune your vehicle to perfection
• Graph/email your logs to BMS to review performance
• Change user adjustment/methanol settings
• Update JB4 firmware
• Custom gauge colors/themes
• Charge your phone while using JB4 software
• Made in the USA

JB4 app is sold separately in the app/play store.

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.

The new JB4 PRO free app and Bluetooth adapter are the perfect connection companion for your JB4!

It starts with our newly designed Bluetooth adapter featuring a relatively simple, low-cost, high-power, and reliable BLE chipset. The new adapter is compact enough to fit fully inside your JB4 enclosure and powerful enough to ensure a consistent connection inside the car.

The all-new JB4PRO free app, which runs exclusively on our new adapter was designed from the ground up in-house for ease of use, simplicity, and reliability. Able to operate fully offline, it includes all the features you've come to expect from a JB4 app, including map switching, live data monitoring, auto logging, read/delete fault codes, firmware updates, setting changes, and more. We've also added useful help functions to describe what the settings do, performance metrics and analysis tools so you can evaluate your car's performance, GPS elevation/speed as a logging channel, and often requested functions such as "restore default settings".

DYNO RESULTS: Lotus Emira 3.5L Stock vs. Tuned

Frequently asked question can be found here