BMS BMW N55 JB4 Tuning Box for Electronic Wastegate – M135i, M235i, M2, 335i, 435i
Unlock serious power and drivability from your turbocharged N55 BMW with the Burger Motorsports JB4 tuning box for Electronic Wastegate models. This plug and play piggyback ECU is the proven remap alternative for BMW M135i, M235i, M2, 335i and 435i owners who want big gains, daily reliability and full control from the driver’s seat.
Expect up to 60 whp on a completely stock car and up to 100 whp on a fully modified setup, with smooth power delivery and factory-like refinement. At Nforcd we have run the JB4 on our own N55 cars and installed it for many customers. Feedback is consistently excellent for performance, features and ease of use.
- BMW N55 JB4 EWG tuning box for M135i, M235i, M2, 335i, 435i
- Plug and play installation with OBDII integration
- Map switching on the fly from the dash or JB4 Mobile app
- Gear dependent boost control for traction and drivability
- Ethanol blend and race fuel support, WMI integration
- Built in code reading and clearing, free firmware updates
- Dyno proven gains, UK based support from Nforcd
Who is this for
This version is specifically for N55 models with the Electronic Wastegate. If your car has the Pneumatic Wastegate, you will need the BMS N55 JB4 for Pneumatic Wastegate. Not sure which you have? Contact us and we will help you identify your wastegate type.
Real world performance
The JB4 delivers measurable and repeatable performance gains while retaining factory safety systems. Enjoy fast spool, strong mid range torque and harder top end pull without compromising everyday use.
- Stock car gains: up to 60 hp at the wheels
- Fully modified car gains: up to 100 hp at the wheels
- Supports bolt ons, ethanol blends and water meth injection
Core JB4 features
- Simple plug and play harness for easy install and removal
- Enable or disable tuning from the driver’s seat
- Gear dependent boost control to optimise traction
- JB4 Mobile or laptop interface for data logging and updates
- Free firmware updates for ongoing improvements
- Diagnostic code reading and clearing via OBDII
Optional add ons
- Data Cable or Bluetooth Connect Kit for logging, map control and firmware updates
- EWG add on connector to allow the JB4 to directly control the electronic wastegate for higher boost ceilings on heavily modified cars running E85 or WMI. Not used on Map 1 or Map 2 even if installed
Note: JB4_F30 shipments since 15 November 2014 include the FlexFuel add on connector for applicable models.
Compatibility
This BMS JB4 tuning box fits the following BMW N55 Electronic Wastegate models:
- BMW 1 Series: July 2013+ F20 F21 M135i
- BMW 2 Series: 2014+ F22 F23 M235i, 2016+ F87 M2
- BMW 3 Series: July 2013+ F30 F31 335i and 335i xDrive, July 2013+ F34 335i xDrive GT
- BMW 4 Series: 2014+ F32 F33 F36 435i and 435i xDrive
Map guide
Select maps using the in dash controls or via JB4 Mobile or laptop. Map 1 is the default.
- Map 0: JB4 disabled
- Map 1: Additive target, around 4 psi over stock
- Map 2: Additive target, around 6 psi over stock. Ideal for 93 octane and bolt ons. Also suitable for small E85 blends
- Map 3: Progressive WMI mapping
- Map 4: Stock performance with JB4 active for logging only
- Map 5: Autotuning map with absolute target of 11 to 17 psi based on octane and conditions
- Map 6: User definable absolute target map for troubleshooting by professionals only
- Map 7: Race fuel map with absolute target of 18.5 psi. Requires straight unleaded race fuel
What’s included
- F chassis N55 JB4 for Electronic Wastegate
- OBDII cable
Wastegate identification
If you are unsure whether your N55 uses an Electronic or Pneumatic Wastegate, refer to the image below or contact us for assistance. We are happy to confirm the correct JB4 for your car.
Dyno results
Dyno proven gains with typical bolt on modifications:
F30 335i with BMS intake and exhaust
F32 435i with BMS intake and exhaust
F22 M235i with intake and exhaust
Installation and fitting
Installation is straightforward with the supplied plug and play harness. If you prefer professional fitting, Nforcd offers JB4 installation in Warwickshire. Email Sales@nforcd.com with your vehicle details for a fitting quote and availability.
Compatibility check before dispatch
To ensure the part fits your vehicle, we run a compatibility check before shipping. Provide your UK registration number or the last 7 digits of your VIN at checkout or contact us directly.
Part number
F-N55-F30-JB4-EW (Electronic Wastegate)
Manufacturer and warranty
Manufactured by Burger Motorsports. Covered by a 5 Year BMS Repair Warranty.
Videos
JB4 Optional Phone Software
Change maps on the fly
JB4 Optional Startup Gauge Sweep
Why buy your JB4 from Nforcd
- Specialists in BMW performance parts and tuning boxes
- Hands on product knowledge and UK based support
- Professional fitting available in Warwickshire
Search friendly terms
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