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Default JB4 B48/B58 Firmware, Settings, and Notes - 06-18-2015, 10:32 AM

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THIS PART IS LEGAL FOR USE ONLY IN COMPETITION RACING VEHICLES AS DEFINED UNDER CALIFORNIA LAW, AND IS NOT LEGAL FOR USE IN ANY OTHER MOTOR VEHICLE. California law defines a "racing vehicle" as "a competition vehicle not used on public highways." (Calif. Health & Safety Code 39048) This part may only be used on competition racing vehicles operated exclusively on a closed course in conjunction with a sanctioned racing event. Competition-only motor vehicles may not be driven to a racing event on a public highway and must be transported on a trailer or other carrier. USE OF THIS PART IN ANY OTHER VEHICLE MAY SUBJECT YOU TO FINES AND PENALTIES FOR VIOLATION OF FEDERAL AND/OR STATE LAW, WILL VOID YOUR WARRANTY FROM BURGER MOTORSPORTS, INC, AND CAN VOID YOUR VEHICLE'S WARRANTY. It is your responsibility to comply with all applicable federal and state laws relating to use of this part, and Burger Motorsports, Inc hereby disclaims any liability resulting from the failure to use this part in compliance with all applicable federal and state laws.

This thread will be the single source of information for everything BMW B48/B58 JB4 related! Note both engines use the same hardware. The JB4 will detect the different during installation and map accordingly.

B48/B58 JB4 Install Guide: Latest Install Guide

JB4 Mobile Smart Phone wireless connection directions Click here.
BMS data cable hard wired software and directions Click here.

Map Guide as of v15+ firmware:

Map0: Stock tuning, fully disable JB4
Map1: Additive map with peak of 3psi over stock added (91 octane)
Map2: Additive map with peak of 4psi over stock added (91-93 octane)
Map3: Additive map with peak of 6psi over stock added (93+ octane)
Map4: Absolute target map with peak of 20psi target (93+ and/or E30 octane) suggested for higher boost models like G chassis, Supra, and Z4. EWG required for proper control.
Map5: Absolute target map with peak of 22psi target (E30+ fuel) suggested for higher boost models like G chassis, Supra, and Z4. EWG required for proper control.
Map6: Custom tuning map allowing both additive (below 10psi) and absolute (above 10psi) targeting. Setting RPM1500 boost below 5.7psi will make entire map6 additive, setting above 6psi will make entire map6 absolute target.
Map7: WMI map (boost varies based on WMI additive, meth flow, and other criteria)
Map8: VALET / Low Boost Map



1) Added test fix for older vehicles previously not able to run firmware newer than v11.
2) Adjusted WGDC so it will always display as 0 if not equipped with a EWG connector.


1) Revised map guide, map4 is now absolute 20psi map and map5 absolute 22psi map, especially useful for Supra/M340i applications on E85 mixtures.
2) Revised boost control system for vehicles equipped with the EWG connector. Set duty bias to 50 across the board as the new default settings.
3) Added CANflap support for newer models.
4) Adjusted FF to save unique values per map to facilitate boost targeting during on the fly map changes.
5) Added speed logging parameter.


1) Changes to support back end flash maps (see B58 BEF thread for details)
2) Adjustment to in dash controls to correct bug with newer vehicles having bouncing gauges while in dash mode
3) Added high fuel pressure as a CANbus logging channel
T11) Added meth_trigger = 4 mode, to allow meth to flow on map0 with OBDII removed.

JB4 v13_1 firmware:

1) Made fuel pressure safety more sensitive

JB4 v13 firmware:

1) Added active safety system for high fuel pressure. JB4 will revert to safety is fuel pressure drops below 7 (1000psi) during full throttle.
2) Moved safety/VALET map to map8
3) Adjusted map4 to be a performance map between map3 and map5. With the BEF map4 targets around 20psi
4) Adjusted FF learning to be slightly more aggressive.


1) Potential fix to diagnostic code clearing bug that has cropped up with the latest software builds.
2) Adjustment to absolute target mapping, lots more testing needed. Send in some logs if running absolute target maps like map7.
3) Changed map4 to low boost VALET map.

Default Settings:

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'OBDII In Dash Menu

'0 map menu, map shown on tach (tach shows Map)
'2 Boost gauge on fuel, scaling in dash is 0 to boost safety setting, turns on when gas pedal is pressed 60% or more and turns itself off when you resume low throttle use. (tach = 0 OFF; tach = 1 Boost Only; tach = 2000 Boost on fuel, Meth on speedo ring; tach = 3000 Boost on fuel, Timing on speedo ring; tach = 4000 Boost on fuel, AFR on speedo ring)
'4 Delete Fault Codes
'5 Dash Mode. tach = 1000, SAE; tach = 2000 Metric
'6 1st gear boost limiter. (Tach = boost cap / 3)
'7 2nd gear boost limiter. (Tach = boost cap / 3)
'8 3rd gear boost limiter. (Tach = boost cap / 3)

How to update firmware:

For firmware updates if having issues we suggest you turn off WiFi, change upload timeout to 25, and set your phone next to JB4 box under the hood.

Download firmware using the new JB4 Mobile firmware database or externally by clicking this link.

Copyright Notice:
JB4 Software is Copyright 2006-2016 by Burger Motorsports Incorporated. All rights are reserved. De-compilation, disassembly, reverse-engineering, alteration, and redistribution in any form without the prior written consent of Burger Motorsports Inc. is prohibited.
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It is the sole responsibility of the purchaser and installer of any BMS part to employ the correct installation techniques required to ensure the proper operation of BMS parts, and BMS disclaims any and all liability for any part failure due to improper installation or use. It is the sole responsibility of the customer to verify that the use of their vehicle and items purchased comply with federal, state and local regulations. BMS claims no legal federal, state or local certification concerning pollution controlled motor vehicles or mandated emissions requirements. BMS products labeled for use only in competition racing vehicles may only be used on competition racing vehicles operated exclusively on a closed course in conjunction with a sanctioned racing event, in accordance with all federal and state laws, and may never be operated on public roads/highways. Please click here for more information on legal requirements related to use of BMS parts.
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