JB4 Mobile v3.0.5

★★★★★

Zack

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!

★★★★

David McElhaney

Great experience but needs to be updated to Android 12 capability. I'm unable to connect nto my jb4 because of this

★★★

Nathan Loyer

Note for newbies: if you're using the bluetooth kit to connect, you have to initiate the bluetooth connection from the app and not from the android system settings like every other bluetooth device you would use. It's pretty silly that it requires you to connect this way, but that's how it works.

★★

Jeff Woodard

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.

★

Squigglylinezz

App is nice when I can actually use it. When connected it never wants to read any of the gauges besides boost, it randomly starts "logging" but won't turn off, and it won't read codes. If everything worked they way it should the app would be phenomenal. It's kinda disappointing that I paid like $20 for an app to have the ability to read gauges, data log, scan and clear codes but the only way I can get it to work is by uninstalling the app and then reinstalling.