JB4 Mobile

Review by eFreeware

JB4 Mobile is not a general-purpose car app. It is a data logger and display built specifically for the JB4 tuner from Burger Motorsports, which means it only becomes useful once that hardware is already in the car. That narrow focus is the most distinctive thing about it, and it is also what makes the app worth a closer look for the right owner.

If you run a JB4 and want to see what it is doing while you drive, this is the tool aimed at you. Everyone else can stop reading here. The app costs $27.99, carries no ads and offers no in-app purchases, so the price you see is the price you pay for the whole thing.

Watching the numbers while you drive

The core of the app is a set of live gauges fed by the JB4. Boost, rpm, fuel trims, air/fuel ratios and ignition advance are among the parameters it can show, and the developer describes further values beyond those. For anyone tuning or troubleshooting a turbocharged car, that is the useful part: a continuous readout of what the engine management is actually doing rather than a guess from feel.

Gauge themes can be customized, which matters more than it sounds. A driver glancing at a screen between runs wants the few numbers that count to be legible at a distance, and being able to arrange the display around that is a sensible use of the feature. The interface was rewritten for this version, so the layout is presented as more modern than what came before.

Because the gauges are fed by the JB4, this is a display for the car, not a reference you consult at the kitchen table. The app is rated for Everyone on the store, but its audience is really the person holding the phone in a JB4-equipped vehicle.

Recording runs and making sense of them

Beyond the gauges, the app logs data and graphs it. That combination is what turns a single pull into something you can study afterward: the log captures the run, the graph lays the parameters out against each other, and the built-in raw CSV viewer lets you look at the underlying numbers directly if you prefer them in rows rather than curves.

Logs can be exported by email, which is the practical route for anyone who sends files to a tuner or keeps records of changes over time. Auto WOT logging is also included, so wide-open-throttle runs can be captured without reaching for a button mid-pull.

The app can read and delete codes as well, which saves a trip to a separate scan tool when something comes up. For a car that is being modified, having fault codes, logs and live values in one place is the real convenience here.

Adjusting the tune without a laptop

JB4 Mobile is not only an observer. It lets you modify User Adjustable settings such as boost and fuel, change WMI settings, and switch maps on the fly. Those are the changes an owner would otherwise make through a laptop and cable, and having them on a phone or tablet makes quick adjustments far less of a production.

The app also handles JB4 firmware updating. Keeping the tuner current is part of owning one, and doing it from the same device that shows the gauges keeps the whole routine in one place. The developer lists these as current features rather than promises about future ones, which is the right way to read them.

Map switching on the fly deserves emphasis for anyone who drives the same car in different conditions. Being able to move between maps without shutting anything down is the kind of flexibility that makes the app feel like part of the car rather than an accessory.

Getting connected

Setup depends on which hardware you have. With a JB4 Connect Kit, the developer's steps are to install the kit following the guide for your vehicle, create an account or sign in through the app, make sure the app has the permissions it asks for with location services enabled, and then tap Connect. The location requirement is noted as necessary for Bluetooth Low Energy scanning on some devices.

With a BMS data cable, the route is different, and the developer lays it out as a sequence rather than a single plug-in step.

The recent update tidied a couple of these details: the map and manual log buttons now appear only once a connection is established, and importing logs or firmware refreshes the file list automatically. Both changes reduce the chance of tapping something that cannot work yet.

What the price and the rating tell you

At $27.99 with no ads and no in-app purchases, this is a straightforward paid tool. The decision rests on whether you already own the JB4 hardware it talks to. For someone who does, the cost sits alongside the rest of what tuning a car involves.

The app has been on Google Play since April 2014 and shows more than 50,000 installs with a 3.4 average across 752 ratings. That average is worth weighing honestly. It suggests a tool that a dedicated group relies on rather than one that delights every downloader, and the split is easy to understand given how specific its requirements are.

The most recent update, at the end of December 2025, addressed Android target SDK requirements and the button and file-list behavior mentioned above. It is a maintenance release for an established app rather than a reinvention.

A tool for JB4 owners, and few others

The case for JB4 Mobile is easy to state. If you have a JB4 tuner and want live gauges, logging, graphing, code reading, map switching and firmware updates on your phone or tablet, this app covers all of it in one place for a one-time price.

If you do not have the tuner, nothing here applies to you, and the app makes no attempt to pretend otherwise. That is not a flaw so much as the shape of the product. It is a companion, and companions need something to accompany.

My recommendation is for the owner who already runs a JB4 and wants to stop dragging a laptop out for every adjustment. The 3.4 average is a reminder to read the setup steps carefully before buying, particularly the permission and location requirements for Connect Kit users and the cable order for OTG users. Get those right and the app does the job it was built for.

What's new in version 3.0.5

Support for new Android Target SDK requirements. Map and manual Log button now only appear once connected. Log/firmware import now auto-refresh file list.