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BMS BMW N55 JB4 Tuning Box for Electronic Wastegate (M135i, M235i, M2, 335i & 435i)


  • £479.00
    exc. VAT £399.17
  • 4 reviews

Ready to take your F Chassis BMW N55 turbo to the next level? 

For N55 with the Pneumatic wastegate (Pre July 2013), you will need the BMS N55 JB4 for Pneumatic Wastegate. Please do not hesitate to contact us if you are unsure which wastegate you may have.


You may wish to add the Data Cable or the Bluetooth Connect Kit for additional features.


You may also wish to add the EWG Add-on connector to allow your JB4 to directly control your electronic wastegate raising the boost ceiling for more heavily modified N55 vehicles such as those using E85 or water/meth injection. Connector is not used on map1 or map2 even if installed.


Ready to take your twin turbo BMW to the next level?

How about up to 60hp to the wheels (80hp crank) on a completely stock car or up to 100hp to the wheels (120hp crank) on a fully modified car? The JB4 features a simple plug and play installation harness for easy installation and includes many features not found on any other tune. Including the ability to enable/disable the tuning from the drivers seat, gear dependent boost control to help with traction, ethanol and racing fuel support, built in diagnostic code reading/deleting, free firmware updates, and much more.

Remember the JB4 does not require any additional modifications or previous stages. Simply install the JB4 as your first and only modification and enjoy an entirely new fast and smooth racing experience. The JB4 also does not require any user setup or customization but for more advanced enthusiasts the BMS DATA cable allows you to connect via a laptop for data logging and free software updates.

Note JB4_F30 shipments as of 11/15/2014 include the FlexFuel add on connector. This no longer needs to be purchased separately for these models. Also note the EWG add on connector remains optional and can be purchased separately for higher HP applications where direct EWG control is required.


Map Info (Updated on 17.07.2018)

(selected via menu 0 in dash or using JB4 Mobile/laptop interface. Map1 is the default map)

Map 0: JB4 disabled 
Map 1: Additive target, around 4psi over stock.
Map 2: Additive target, around 6psi over stock. Suggested for those with 93 octane and bolt on modifications. Also good for small E85 mixtures. 
Map 3: Progressive WMI mapping.
Map 4: Stock performance with JB4 active for logging only.
Map 5: Autotuning map, absolute target of 11-17psi based on octane and conditions. 
Map 6: User definable absolute target map. Suggested for troubleshooting by professionals only. 
Map 7: Race gas map. Absolute target of 18.5psi. Requires straight unleaded race gas.


F Series N55 JB4 Dyno results

BMW F Series N55 JB4 (M135, M235i, M2, 335i & 435i) Dyno - F30 335i with BMS intake, exhaust ML Performance UK
F30 335i with BMS intake, exhaust


BMW F Series N55 JB4 (M135, M235i, M2, 335i & 435i) Dyno - F32 435i with BMS intake, exhaust ML Performance UK
F32 435i with BMS intake, exhaust


BMW F Series N55 JB4 (M135, M235i, M2, 335i & 435i) Dyno - F22 M235i with intake, exhaust ML Performance UK

F22 M235i with intake, exhaust


Identifying Wastegate Type


JB4 Optional Phone Software


Change maps on the fly:


JB4 S55 CAN Flap DEMO:


JB4 Optional Startup Gauge Sweep


F10 models will need to check their sensor type before ordering.
This does not apply to F30 models.


Click here for the latest JB4 firmware, map guide, and details.


Compatibility Check

To ensure the part(s) you have ordered fits your vehicle, we run a compatibility check prior to dispatch. We can do this either using your registration number(UK) or the last 7 digits of your VIN. Simply enter your car details prior to checkout.


In the box: 

F Chassis N55 JB4 (EWG)

OBDII cable



BMW 1 Series
 July 2013+ N55 BMW F20 F21 M135i

BMW 2 Series
 2014+ N55 BMW F22 F23 M235i
• 2016+ N55 BMW F87 M2

BMW 3 Series
• July 2013+ N55 BMW F30 F31 335i/ix
• July 2013+ N55 BMW F34 335i xDrive GT

BMW 4 Series
• 2014+ N55 BMW F32 F33 F36 435i / 435ix

For E Chassis N54 JB4 Click Here



5 Year BMS Repair Warranty


Manufactured by

Burger Motorsports


Part Number

F-N55-F30-JB4-EW (Electronic Wastegate)

BMS BMW F SERIES N55 JB4 (M135 M235I M2 335I 435I) | NEXT DAY DELIVERY ML Performance UK

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