Up to 40whp. No Flash. No Risk.
The JB4 is the most proven plug-and-play tuner for the 2.0L Turbo Jeep Wrangler & Cherokee — serious power gains on pump gas without ever touching the ECU, with full Bluetooth monitoring, in-dash map switching, and E85 support built in.
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.
On a completely stock 2.0L Turbo Jeep running pump gas, the JB4 makes up to 40 horsepower at the wheels (roughly 55hp at the crank). Install it, tune it, pull it — the factory ECU never knows it was there. Not VIN locked, fully transferable, fully reversible.
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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 live engine parameters, log data, read and clear fault codes, and pull free firmware updates as Burger drops new maps.
Prefer to keep your phone in your pocket? The JB4 also supports in-dash map switching and boost-by-gear right from the factory controls — no screen required.
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Datalogging, Code Reading & E85 — All Built In
Every JB4 includes built-in datalogging and OBD code reading, so you can capture full logs of your runs, monitor live engine data, and read or clear fault codes without a separate scan tool.
Running higher-octane fuel? The JB4 supports E85 blends and progressive water/methanol injection, letting you safely unlock even more power when the fuel supports it. Start on pump gas and grow into it — the tuner scales with your build.
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Billet Aluminum. Made in the USA. 5-Year Warranty.
The JB4 is housed in a rugged billet aluminum enclosure, designed and assembled in the USA. Burger Motorsports has been the gold standard in plug-and-play turbo tuning for over a decade, and every JB4 is backed by a 5-year warranty.
The JB4 PRO Bluetooth adapter fits entirely inside the enclosure — no dangling dongles, no exposed ports, weather-protected from the start.
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⚡ Features & Benefits
- Up to 40whp / 55 crank hp on a stock 2.0L Turbo Jeep, pump gas
- Plug & play — no ECU flash, locked-ECU compatible
- In-dash map switching and boost-by-gear
- Built-in datalogging and OBD code reading
- E85 and water/methanol (WMI) support
- Not VIN locked — fully removable, leaves no trace
- Billet aluminum enclosure, designed & assembled in the USA
- 5-year warranty from Burger Motorsports
📦 What's in the Box
JB4 tuner unit in billet aluminum enclosure · Plug-and-play installation harness · JB4 PRO Bluetooth adapter (pre-installed) · Access to the free JB4 PRO iOS/Android app · PDF install guide · 5-year warranty
Note: 91 octane or better recommended for full performance gains. Map 0 runs on any fuel with no performance modification.
Install Takes Minutes
The JB4 uses a plug-and-play harness that connects between your engine sensors and the factory ECU — no cutting, no soldering, no shop visit. Pull it out just as easily if you ever need to service the vehicle or want to transfer it to a new build.
Install guide (PDF): JB4 Jeep 2.0L Install Guide
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This Part Fits
| Year |
Make |
Model |
Engine |
| 2018+ |
Jeep |
Wrangler |
2.0L Turbo |
| 2018+ |
Jeep |
Cherokee |
2.0L Turbo |
Dyno Results — Real, Repeatable Power
Independently proven on the dyno: up to 40whp / 55 crank hp on a completely stock 2.0L Jeep on pump gas. JB4 map vs. stock, 93 octane. No mystery numbers — see the gains for yourself.
2.0L Jeep Wrangler / Cherokee — JB4 Map 2 (93 octane) vs. Stock.
FAQ
What is a JB4?
The JB4 is a plug-and-play performance tuner that connects between your engine sensors and the factory ECU. It reads and adjusts boost, timing, and fueling in real time to safely make more power — without flashing or modifying the ECU itself. |
Is the JB4 a real tune?
Yes. Unlike throttle boosters or plug-in "chips" that just fake pedal response, the JB4 actively adjusts boost pressure, ignition timing, air-fuel ratios, and fuel trims through a full CANbus connection — delivering real, dyno-proven power gains comparable to an ECU flash. |
Will this work on my locked ECU?
Yes. The JB4 is fully compatible with locked ECUs. It works between the engine sensors and the ECU — it never accesses or modifies the ECU itself. |
What are the power gains?
Up to 40 horsepower to the wheels (about 55hp at the crank) on a stock 2.0L Turbo Jeep running pump gas. More is available with higher octane, E85 blends, or supporting mods. |
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 support E85 and water/meth?
Yes. The JB4 includes E85 support and progressive water/methanol (WMI) integration, so you can unlock even more power as your fuel and supporting mods allow. |
