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JB4 Performance Tuner
N55 JB4 Upgrades

JB4 N55 Replacement Control Board

Update or replace your JB4 control box with the latest options listed below. Note most 2014+ vehicles include electronic wastegates and will benefit from the EWG board. If upgrdaing a previous PWG system to EWG we suggest you modify the JB4 harness by cutting off the black ground & red power wires. Also note the purple MAF harness is no longer used for any N55 application so this can also be cut off the harness to clean it up. Note replacement boards do not include an enclosure and will ship with the latest production firmware. In the case of F series this is OBDII CANbus based firmware.

Jb4 N55 F30 BMW EWG upgrade board
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$175.00
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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.
CANbus Interface JB4 N55 BMW

$35.00
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N55 PWG Updated 2431 Driver Chip for Port Injection Integration

This updated chip has new low level firmware allowing integration with both the BMS PI and AIC6 PI controllers. JB4s shipped after 10/1/16 already have this firmware in place and don't need this upgrade. Only applies to PWG specific boards and is NOT required for EWG boards.

CANbus Interface JB4 N55 BMW
$25.00
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JB4 2580 Master Chip

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.
CANbus Interface JB4 N55 BMW

$25.00
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Replacement N55 Harness

For those with a damaged harness or in need of a harness swap we offer an entirely new N55 wiring harness for $250. A $100 core charge applies and will be refunded upon return of your damaged/old wiring harness.
N55 JB4 Harness Type A

$250.00 + $100.00 Core Charge
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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.

$99.00
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TMAP Adapter JB4

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.

BMW Flexfuel

$25.00
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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


BMW Flexfuel

$35.00
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JB4 Port Injection Control Module, ala-cart

$299.00
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JB4 plastic all weather enclosure

A plastic version of our fully weather proof JB4 enclosure. To install remove the existing harness amp cover and attach to the JB4 board using the included hardware. The board and harness head then fit inside the new water resistant enclosure.

$20.00
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Replacement POSI-TAPS (2)

For tapping wires. Electrical connectors require no crimping and simply hand tighten.
Posi Tap connector
$5.00 + Free Shipping
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