BMS BMW N20 N26 JB4 Tuning Box for 220i, 320i, 420i and 520i
Unlock serious power and drivability from your BMW 2 Series, 3 Series, 4 Series and 5 Series with the Burger Motorsports JB4 Tuning Box. This plug and play piggyback ECU upgrade is the proven, safe and reliable way to add big gains on the BMW N20 and N26 turbo engines. Perfect for 220i, 228i, 320i, 328i, 420i, 428i, 520i and 528i owners looking for a remap alternative that is fully reversible, feature rich and packed with performance.
Expect up to 50 hp to the wheels on a stock car and up to 100 hp to the wheels on a fully modified setup. The JB4 offers map switching, gear dependent boost control, in dash boost gauge, on the fly enable and disable, E85 compatibility, advanced engine safety systems, built in diagnostic code read and delete, exhaust flap control via the BC button and free firmware updates. It installs in minutes, is not VIN locked and can be removed or transferred at any time.
Why choose the JB4 for your BMW N20 and N26
- Massive, proven power gains on BMW N20 and N26 turbo engines
- Plug and play tuning box, fully reversible with no permanent ECU write
- Remap alternative with live map switching and CANbus integration
- Gear dependent boost control for improved traction and acceleration
- E85 ethanol fuel compatibility and powerful map options
- In dash boost gauge, BC button exhaust flap control and stealth operation
- Built in diagnostics with fault code reading and clearing
- Expanded engine safety systems for peace of mind under load
- Free JB4 firmware updates to add features and maps over time
- Not VIN locked, transferable to your next BMW N20 N26 platform
Real world power you can feel
On a completely stock BMW N20 or N26 the JB4 can add up to 50 hp to the wheels, roughly 65 hp at the crank. With supporting modifications the JB4 can deliver up to 100 hp to the wheels, roughly 120 hp at the crank. Results vary based on fuel quality, hardware and conditions, but the transformation in mid range torque, throttle response and overall pace is immediate.
Connectivity, control and data logging
Pair the JB4 wirelessly via the JB4 Mobile connect kit to Bluetooth 4.0 compatible iOS and Android devices or connect to a Windows laptop with the BMS data cable. Record and analyse logs, switch performance maps and update firmware as new features and maps are released. Separate JB4 Mobile app purchase required.
Compatibility and fitment
Designed for BMW models equipped with the N20 or N26 2.0 turbo petrol:
- 2 Series: 2014+ F22 F23 220i, 228i
- 3 Series: 2012+ F30 F31 320i, 328i
- 4 Series: 2014+ F32 F33 420i, 428i
- 5 Series: 2011 to 2016 F10 520i, 528i
- X Series: 2011 to 2017 F25 X3 xDrive20i, xDrive28i
- E chassis: 2013 to 2016 E89 Z4 28i, 2013 to 2015 E83 X1 28i and xDrive28i
Note for X1 and Z4: The X1 and Z4 N20 JB4 uses special firmware with full dash control and a different CAN mounting location.
Installation and support
The JB4 installs and removes in minutes at home with a simple plug and play harness. No special tools required. Because it does not permanently flash the DME, your factory ECU calibration remains untouched. Want expert fitting and a health check while you are at it? Book professional installation with Nforcd in Warwickshire. Request a quote at Sales@nforcd.com.
Trusted by enthusiasts
We run the JB4 on our own N20 shop car and it has been outstanding for daily use and spirited driving. Our customers consistently report smoother power delivery, stronger mid range torque and the convenience of switching maps to suit their fuel and mods. A proper performance upgrade that delivers.
Key features at a glance
- Up to 50 whp gain on stock cars, up to 100 whp on modified cars
- Enable or disable tuning from the driver’s seat
- Gear dependent boost control for traction
- E85 compatibility and flexible mapping
- Built in code reading and clearing
- Expanded engine safety systems
- In dash boost gauge and BC button exhaust flap control
- Free firmware updates, data logging and gauges via JB4 Mobile or BMS data cable
- Not VIN locked, transferable and resale friendly
Part number
F-N20N26-JB4
Manufacturer and warranty
Manufactured by: Burger Motorsports
Warranty: 5 Year BMS Repair Warranty
Videos
Search friendly terms
BMW N20 tuning, BMW N26 tuning, JB4 tuning box, BMW 220i tuning, BMW 320i tuning, BMW 420i tuning, BMW 520i tuning, BMW 228i 328i 428i 528i performance upgrade, BMW piggyback ECU, BMW remap alternative, BMW turbo tuning, BMW N20 power upgrade, BMW N26 chip tuning, BMW boost controller, BMW F30 F31 F32 F10 tuning, BMW X3 xDrive20i xDrive28i tune, BMW Z4 28i tune, BMW X1 28i tune, Burger Motorsports JB4 UK, Nforcd BMW tuning Warwickshire.