The JB4 is the most proven plug-and-play tuner for the B58-powered Ineos Grenadier — serious power gains without touching the ECU, with full Bluetooth monitoring and 8 built-in maps from stock to race gas.
Real Tune. No Flash. No Risk to Your ECU.
The JB4 isn't a throttle booster or a placebo — it actively adjusts boost pressure, ignition timing, air-fuel ratios, and fuel trims using real-time data through a full CANbus connection. That means performance gains comparable to an ECU flash, without ever touching the ECU or risking a bricked tune.
It's fully compatible with locked ECUs. Install it, tune it, pull it — the factory ECU never knows it was there. Not VIN locked, fully transferable, fully reversible.
Full Bluetooth Control — JB4 PRO App Included
The JB4 PRO Bluetooth adapter is built right into this kit. Connect wirelessly from your iOS or Android phone to switch maps on the fly, monitor up to 40 live engine parameters, log data, read and clear fault codes, and pull free firmware updates as Burger drops new maps.
The adapter fits entirely inside the JB4 enclosure — no dangling dongles, no exposed ports, weather-protected from the start.
Stock vs JB4 — Grenadier Dyno
8 Maps — From Mild to Wild
Map 0: Stock — JB4 disabled
Map 1: +3 psi over stock (91 octane)
Map 2: +4 psi over stock (91–93 octane)
Map 3: +6 psi over stock (93+ octane)
Map 4: +8 psi over stock (race gas or 30% E85)
Map 5: +10 psi over stock (race gas or 30% E85)
Map 6: Custom tuning map
Map 7: Progressive water/methanol integration
Map 8: Valet / low boost mode
Install Takes Minutes
The JB4 uses a plug-and-play harness that connects between your engine sensors and factory ECU — no cutting, no soldering, no shop visit. The included install guide walks you through every step. Pull it out just as easily if you ever need to service the vehicle or want to transfer it to a new build.
JB4 tuner unit in billet aluminum enclosure · Plug-and-play installation harness · JB4 PRO Bluetooth adapter (pre-installed) · Access to free JB4 PRO iOS/Android app · PDF install guide · 5-year warranty
Note: 91 octane or better required for performance gains. Map 0 runs on any fuel with no performance modification.
FAQ
Will this work on my locked ECU? Yes. The JB4 is fully compatible with locked ECUs. It works between engine sensors and the ECU — it never accesses or modifies the ECU itself.
What are the power gains on a stock Grenadier? Up to 80whp and 100wtq on a completely stock Grenadier running pump gas (91+ octane). More with supporting mods, higher octane fuel, or E85 blends.
Is it reversible / will it affect my warranty? Fully reversible — unplug and remove, and the vehicle returns to 100% stock. It's not VIN locked and leaves no trace on the ECU. Consult your dealer regarding warranty; the JB4's removable nature is a key advantage here.
Does it work on the Quartermaster pickup too? Yes — fits the 2023+ INEOS Grenadier SUV and the Quartermaster 3.0L B58 pickup version.
What does the Bluetooth app do? The free JB4 PRO app (iOS/Android) lets you switch between maps, monitor up to 40 live engine parameters, log data, read and clear fault codes, and download firmware updates — all wirelessly from your phone.
Do I need supporting mods? No — the JB4 delivers gains on a completely stock vehicle. Bolt-on upgrades, E85 blends, and larger turbochargers will unlock more, but none are required to run the unit.
