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JB4 Performance Tuner
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JB4 Upgrades, Wiring, Parts, Cases, and Accessories

JB4 Replacement Control Boards

Replacement JB4 Control boards.

$175.00
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JB4 BMW performance tuner
Jb4 N55 F30 BMW EWG upgrade board
Jb4 N55 F30 BMW EWG upgrade board

 

JB4 Replacement & Upgrade Chips

This replaceable chip controls the communications between the JB4 and your BMS data cable or JB4 Mobile kit as well as the model specific firmware. If damaged you will not be able to connect to the JB4. Be sure to specify which firmware you need in the drop down for the chip to work properly with your model.

$25.00
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CANbus Interface JB4 N55 BMW
 

JB4 Replacement Harnesses

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Juice Boc JB3 Plug & Play Harness
N55 JB4 Harness Type A

JB4 connectors

JB4 Fuel Pressure Connector
Current harnesses include this fuel connector already. Older harnesses can purchase the upgrade here. Check your harness before ordering to determine whether or not you have the connector. It's a 3-position connector with black wires that connects to the fuel pressure sensor.

JB4 F Series EWG Add On Connector
For 2014+ F Series N55 motors that have an electronic wastegate. This add on patch allows 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. Additional information and directions are posted here: http://www.n54tech.com/forums/showpost.php?p=299688&postcount=539

F Series OBDII CANbus Interface
Changes the connection point for the JB4 CANbus from POSI-TAP connectors to a fully plug and play OBDII cable. The OBDII cable is routed through a preexisting hole in the firewall for easy installation and includes a MOLEX connector and pigtail for easy installation. Requires special JB4 OBDII firmware that is posted to n54tech.

Starting at $25.00
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BMW Flexfuel
BMW Flexfuel
CANbus Interface JB4 N55 BMW

Boost solenoids

Replacement factory N54/N55 boost solenoid 
Worn or tired boost solenoids result in less vacuum reading your wastegate and boost falling below target. Replace them with these OEM quality parts. N54s use two solenoids, while N55s use one.

Single turbo boost solenoid
Use this plug and play low frequency MAC solenoid if retrofitting a single turbo kit to your N54 or N55. Includes plug and play harness connector for no splicing! 

Starting at $49.00

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TMAP Adapter JB4
TMAP Adapter JB4

JB4 N54 Wiring Extras

JB4 Anti Lag Kit
Includes programmed chip and wiring harness to allow on the fly anti-lag. Select a gear, hold down the volume button, floor the car, and once boost has built up release the volume button to instantly take off under full boost. Absolute must have for rolling races of any transmission type and works well for automatics off the line too. Requires a BMS back end flash map and ethanol fuel is strongly suggested. Installation directions and additional details are posted here.


G5 2STEP Relay for manual transmissions
Enables G5 2STEP rev limiter for more consistent manual transmission launches and no-lift / flat foot shifting. Requires BMS DATA cable.



G5 speed limit defeat wires
Allows G5 board to remove your speed limiter. Not required if also equipped with BMS flash. Operating a vehicle at high speed involves extreme risk including the risk of serious injury or death and should only be attempted by professional drivers in a closed environment. Use subject to terms and conditions posted. Requires BMS DATA cable.



JB3->JB4 power wire 
This power wire is required if updating from a JB3 harness.



Replacement POSI-TAPS (2)
For tapping wires. Electrical connectors require no crimping and simply hand tighten.

Starting at $5.00
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JB4 power wire
Posi Tap connector

JB4 3.5bar and 4bar plug and play TMAP adapters

Use these plug and play adapters to quickly adapt a 3.5bar or 4bar TMAP sensor to your N54, raising the boost maximum boost range from 20psi factory up to 36psi for the 3.5bar and 43psi for the 4bar. For most applications the 3.5bar adapter is suggested which requires OEM BMW sensor part number: 13627843531. For very high boost applications the 4bar adapter can be used which requires Bosch 4bar sensor part 281002576.

$32.50
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TMAP Adapter JB4

JB4 port injection control module

Attaches to the JB4 allowing it to directly control both traditional
port injection kits and WMI port injection kits. Click here for the
port injection FAQ and additional information for wiring and
requirements.


$299.00
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JB4 Enclosures

E Series High Temp Enclosure
For use with all E chassis JB4 and Stage1 systems where the tuner box sits inside a weather proof DME box.

F Series All Weather Plastic Enclosure
A plastic version of our fully weather proof JB4 enclosure. Compatible with Stage1. Note for older systems to retrofit to this enclosure you first must remove the amp shell covers on the JB4 harness and gray shell covers on your BMS data cable or REV3 device. Includes required hardware.

F Series Billet All Weather Enclosure
The highest end enclosure we offer this sleek, stylish JB4 billet aluminum enclosure withstands drops, shocks, and bumps while protecting electronics from dirt and water. CNC machined with a rubber sealing ring. Compatible with JB4 and Stage1 systems. Includes required hardware. Billet Case bolts are 6-32 x 5/8" and use a 7/64" allen wrench.

$10.00 - $59.00
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