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Ando @ BMS Ando @ BMS is offline
BMS Customer Service
Posts: 733
Join Date: Jan 2013
Car: bmw 335i
Default 05-08-2017, 03:26 PM


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

The JB4 is available as a complete system or as an upgrade kit to the Stage1 tuner. It adds CANbus control and other features to the Stage1 tuning allowing multiple maps based on expanded engine criteria, smoother partial throttle performance, additional engine safety systems such as lean run or over boost, more advanced logging for those wanting to experience with different fuels and E85 mixtures, boost by gear to improve traction, and much more to come via free firmware updates.

While Stage1 installs in under 60 seconds the JB4 install requires an additional OBDII cable to run through an existing grommet in the firewall adding 15-20 minutes to the process.

Note the Q50/Q60 JB4 uses different firmware and different map settings than Stage1. Details are posted in the upgrade PDF below.

JB4 Install Guide:

Stage1-> JB4 Upgrade guide:

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JB4 Firmware Notes:

Firmware updates are optional and loaded via either JB4 Mobile or a BMS data cable. We use updates to add new features, fix bugs, and make performance improvements, as documented in the firmware notes. Only the newest (highest number) firmware update is required as each firmware contains all previous updates.


1) Adjustment to fuel control mapping to add more fuel at higher RPM
2) Added support for BMS WMI kit under map8
3) Added linear pedal mapping option under FutureUseD Bit7. Turn on to smooth out boost targeting as a function of gas pedal input.
4) Added custom fuel mapping option under FutureUseD Bit1. Turn on to manually adjust "fuel enrichment" offset by RPM. Default values would be 50 across the board. Not suggested for most customers to play around with or touch this.
5) Fixed bug with false AFR reading during decel.


1) Added support for JB4 fuel control wires. To enable install wires to JB4 and set FutureUseD bit0 on. Once enabled you'll see "fuel enrichment" dynamically adjust in JB4 logs as it drives AFR up to the revised targets. Setting bit0 on WITHOUT the fuel wire will not negatively effect anything, but AFR readings in logs will not be accurate.
2) Added beep confirmation indicator when changing maps. Car should beep the number of map selected.
3) Added beep confirmation indicator when saving settings. Car will double beep when saving.


1) Adjusted boost by gear to allow targeting of less than the factory (or flashed) boost target. For example a 1st gear setting of 6psi will reduce boost in 1st gear by 6psi regardless of the JB4 boost target. Very useful for those using JB4 in conjunction with flash maps that have higher boost targets.
2) Added map8 for progressive water/meth (WMI) control. Boost is held at stock levels until WMI is flowing to avoid tip in knock, boost is increased as a function of WMI flow, so that if there is a flow issue due to mechanical issue (leak, electrical failure, run out of fluid), boost will safely transition down to stock levels avoiding serious engine knock.
3) Added high fuel pressure logging under FP_H parameter. Scaling is 1 = 150psi.
4) Added high fuel pressure "target" under FP_L parameter with similar scaling. Useful for evaluating the new parameter FP_H under various power levels, fuels, and conditions. Later we'll figure out how to add actual low fuel pressure to this parameter.
5) Adjusted map3 so it's now blend of map3 and map5.
6) Adjusted map7 for increased boost target at lower engine speeds.
7) Revised partial throttle mapping for improved boost response.


1) Added oil temp to logging channels
2) Added charge air coolant temperature to logging, under "TransTemp" channel
4_1) Fixed bug in charge air coolant temp logging


1) Changed map4 over to "valet map" that reduces boost 6psi over stock.
2) To avoid confusion adjusted IAT logging parameter to reflect MAF intake temperature on all models. Still working on getting charge air temperature (what we want to see!) active on all models, in addition to charge air coolant temperature.


1) Added some additional data for log analysis, for internal use
2) Adjusted CANbus module so the JB4 can continue to act as a Stage1 when OBDII port is removed or not plugged in.


1) Fixed bug with pedal input showing 109 at full throttle instead of 100
2) Fixed bug with air intake temperature not updating at full throttle


1) Enabled OBDII code read/delete using JB4 interface. Select E series N54 until a dedicated Q50/Q60 engine type is added to interface.
2) Adjusted road speed output per BETA interface. Note currently it will log in KMH, expect a toggle soon on the interface side to allow moving between KMH and MPH.
3) Enabled boost by speed. Values of 0 disables. Otherwise "1st gear" sets maximum boost added below 31mph, "2nd gear" sets maximum boost added below 55mph, and "3rd gear" sets maximum boost added below 84mph. Generally speaking this feature will be used by RWD vehicles and in most cases only in 1st gear, with a setting of say 2psi in 2nd gear to assist with traction as needed during launches.

JB4 Maps as of v5 firmware:

Map0 - JB4 disabled
Map1 - 4psi peak
Map2 - 5psi peak
Map3 - 5.5psi peak
Map4 - Low boost VALET map (200hp simulation!)
Map5 - 6psi peak
Map6 - User adjustable by RPM map using settings on user adjustment page. Setting of 5.0 would request 5psi over stock at that specific engine speed.
Map7 - 7psi peak
Map8 - Progressive WMI integrated map, boost profile under WMI flow adjustable on WMI page.

Optional fuel control wires:

Dyno Test: - International Turbo Racing Discussion - View Single Post - Infiniti Q50 3.0t VR30DDTT Red Sport and Silver Sport BMS Stage1 JB4

Cliff Notes: Short fuel wire w/ resistor goes in spot 21, long wire goes in spot 20, and both wires then posi-tap to the white signal control wire in the primary o2 sensors. JB4 v6+ firmware required, to enable fuel control set FutureUseD bit0 on.

Water/Meth WMI Dyno & Details: JB4 Q50 Q60 VR30 Water/Meth (WMI) Dyno Info - - International Turbo Racing Discussion

Q50/Q60 JB4 with BlueTooth kit demo:

How to attach BlueTooth kit:

How to update firmware:

Attached Files
File Type: hex JB4_Q50_OBDII_4_1.hex (46.4 KB, 742 views)
File Type: hex JB4_Q50_OBDII_5.hex (50.1 KB, 444 views)
File Type: hex JB4_VR30_6.hex (55.3 KB, 467 views)
File Type: hex JB4_VR30_7.hex (56.3 KB, 945 views)

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