657 reviews
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About this app

JB4 Mobile is a mobile data logger and display for use with the JB4 tuner from Burger Motorsports.

To connect, simply attach the JB4 data cable to your device using an OTG cable.
***Use a good quality OTG cable to avoid connection issues.
***If you keep getting "Serial port not available" errors, 1 of these issues is probably the cause:
1) Your OTG cable is faulty
2) Your device either doesn't support OTG properly or requires a powered USB hub
3) You're using a Galaxy S6/S6 Edge (see below)

Galaxy S6/S6 Edge Owners using an OTG cable: It has come to my attention that to get these devices to work correctly, you must first connect the OTG cable to your device, THEN connect the JB4 cable, THEN open the app and connect. Not sure why these devices are so picky, but at least someone found a workaround.

JB4 Mobile allows you to monitor multiple parameters of your JB4 equipped car at once. Parameters such as boost psi, rpm, fuel trims, air/fuel ratios, ignition advance, fuel pressure and much more are all available.

Current Features:
Data Monitoring
Data logging (log files are fully compatible with JB4 Windows software)
Data Graphing
Email and rename saved logs
Read/Delete codes
View previously read codes
Modify boost/fuel mapping
Modify methanol settings
Switch maps on the fly
Auto WOT logging
GPS Speedometer
G Force Meter
JB4 Firmware Updating
Landscape Support

How to calibrate the G Force meter:
1) Make sure your device is mounted in your vehicle in a (mostly) upright position (portrait only support for now).
2) Select a G Force gauge on the display screen.
3) When the vehicle is at a complete stop on a flat surface, simply double tap on the G Force gauge.
4) When the dot is centered in the circle with the car at a flat rest you know it is calibrated.

To switch what a gauge displays, just tap and hold on that gauge and a menu will appear.

To view your max boost, simply double tap on the boost gauge (double tap again to view live boost, max boost is reset after viewing).

JB4 ® is a registered trademark of Burger Motorsports Inc ® and is used with written permission.
Updated on
Sep 14, 2023

Data safety

Safety starts with understanding how developers collect and share your data. Data privacy and security practices may vary based on your use, region, and age. The developer provided this information and may update it over time.
No data shared with third parties
Learn more about how developers declare sharing
This app may collect these data types
Personal info and App info and performance
Data is encrypted in transit
You can request that data be deleted

Ratings and reviews

615 reviews
July 22, 2021
Does it's job very well with little issues. Occasional crash when pushing new tune settings in, and the resolution can get screwed up if you flip to portrait and landscape too many times really quickly. Every very minor bug is fixed with a restart of the app. JB4 Support is amazing. The system has made our 2019 VW rocket like it should have from the factory. It is loads of fun fine tuning your map bit-by-bit and getting more power, economy, and fun. Hands down recommend!
18 people found this review helpful
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Dmac Mobile Developments, LLC
September 8, 2021
So glad you're finding the app useful. Please be sure to submit any crash reports to us so we can squash those bugs. Thank you for the review! :)
Christopher Hurley
September 27, 2023
Logging is.. more or less bulletproof now. But, there are no updates to the values after the first pass of each group in built in graph viewer. Seems to make least one new file after midnight. Restarting app helps a little but after enough times it will not connect to the jb4 unit. Maps have no descriptions so it's anyone's guess what settings are being applied when I pick one.
1 person found this review helpful
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Jeff Woodard
April 24, 2023
Unit itself is great. The app is great when it connects. But sadly that's far too rare. And the company doesn't seem to care. Doesn't matter if you have Bluetooth or hard wired set up either. Most users experience the problem where it just won't connect. And then randomly once ever couple hundred attempts it might work. If they ever care enough to fix this very real problem the JB4 will be once of the very best options for tuning tubo cars. But without being able to connect I can't recommend.
16 people found this review helpful
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Dmac Mobile Developments, LLC
May 16, 2023
Sorry for your issues, but most users actually don't experience that problem because if they did, this would be a 1 star app. Contact our support team and we'll help you get the connection issue resolved. support@jb4connectkit.com

What's new

Minor updates for Android 13 compatibility.