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Default N54 MHD Back End Flash Maps - 03-05-2015, 02:37 PM

Use subject to terms and conditions posted at

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.

Use this thread for discussing the MHD N54 flashing tools, logs, XDF files, BINs, etc!

What is a back end flash map?

For those who prefer flash tunes but want to keep the benefits of JB4 functionality and features just add in a back end flash map. The BEF are templates you can write to your DME using the MHD N54 flashing system that is specifically designed to compliment JB4 tuning. These maps adjust fueling, timing, load targets, VANOS, and other functions on flash side while allowing the JB4 to retain its superior absolute boost control, on the fly map changes, in dash gauges, shift light, auto learning/self tuning, gear dependent boost control, data logging, WMI integration, PI integration, NLS, and other features. It's simply the best of both worlds and greatly eliminates the need for expensive and time consuming "custom tuning" those running flash only often have to resort to. Note BMS is not affiliated with MHD and no flashing support is provided beyond the templates posted. Contact MHD directly for flashing support and additional information as needed.

What are the benefits of running a JB4 with a flash rather than flash only for tuning?

While it's possible to tune an N54 without a JB4 doing so comes with many disadvantages.

1) The JB4 includes more robust safety systems than are possible via flash only. Starting with fundamental safety systems like reverting to a safety map if boost exceeds your safety setting, if the air/fuel ratio in either bank turns dangerously lean, or if fuel pressure drops below a safe level. While you might think the DME alone can handle these basic safety systems surprisingly it's not the case. The DME will happily let you run along at full power and a 18:1 AFR, with boost pegged if a WG line drops off, and the only fuel pressure safety provided is when fuel pressure drops down so low fuel injection itself has to be suspended. In addition to these basic safety systems the JB4 offers layered advanced safety systems. For example it monitors fuel trims bank to bank and reverts to safety if they exceed more than a 15% variance indicating a possible fuel distribution or o2 sensor issue. Port injection and WMI add extra failure points and the JB4 control provides advanced safety systems for them as well. The port injection FAQ covers the basics.

2) The JB4 boost control system is programmed as absolute meaning you'll always target a specific boost level. Unlike the DME which naturally implements a LOAD control system where boost levels go down when it's cold and go up when its warm. The opposite of what you generally want for turbocharged performance. In addition the JB4 is quick and easily adaptable to a wide range of setups eliminating the need for expensive custom boost tuning and the risks that come with repeated logs on systems that are not yet setup. It's not uncommon for engine damage to occur while a new setup is initially being dialed in. The JB4 automatically tunes wastegate dutycycle, fuel trims, and other important tuning criteria full time in the background greatly simplifying the tuning process. In addition the JB4 auto-tuning map can self tune for various ethanol mixtures without the need of an expensive and difficult to install flex fuel sensor. Pedal to boost mapping, spool aggression, boost by gear, and other critical factors can be easily adjusted in dash on the fly to suit the needs for the particular track or racing situation.

3) On the fly changes. Whether it's changing the boost/power level, boost by gear setting (including being able to disable it on the fly for burn outs or if traction turns out to be better than expected), pedal input, 2STEP RPM, or what gauges are shown in dash, the JB4 allows a wide range of user adjustment real time from the drivers seat without having to use a 3rd party device or risk programming the DME between runs. You're able to make the changes while out on the track where you need to make them.

4) The JB4 allows for much better real time feedback to the driver. User adjustable in dash gauges allow you to keep a constant eye on boost, timing, knock, meth flow, and/or AFR, all selectable and changeable on the fly from the drivers seat. A user adjustable shift light can be triggered making rowing through the gears easier. JB4 Mobile allows wireless bluetooth logging via your Android or Apple phone without a cable locked in your OBDII port. In addition you can select map0 on the fly to allow OBDII port logging and diagnostics when needed for vehicle service. The JB4 default logging set includes all relevant data required for tuning including boost, timing cylinders 1-6, AFR and fuel trims in both banks, high and low fuel pressure, load, calculated torque, trans temperature, and many other parameters. The JB4 provides a simple to use but incredibly robust data logging system eliminating the need to select what parameters to record before each run and providing instant on the fly charting without the need of 3rd party internet programs. We routinely add parameters to the JB4 logging set based on customer feedback and evolving tuning requirements. The JB4 samples boost and analog sensors 250 times per second and CANbus specific data like air, fuel ratio, fuel trims, and timing advance 10 times per second.

5) Integrated JB4 features such as no lift shift, 2step, anti-lag, port injection control, flex fuel sensor, and progressive water/meth (WMI) control eliminate the need for independent add on boxes that are more difficult to install and technically unable to communicate with each other. Integration allows these extra features to share information for a smooth and cohesive tuning solution. For example with the JB4 NLS and JB4 port injection control when you press the clutch in for NLS your port injection flow is momentarily suspended to avoid huge backfires that have been known to blow out o2 sensors and in extreme cases blow up intake manifolds. When the DME requests a torque drop due to traction or stability control the JB4, WMI, and PI systems all respond accordingly. JB4 anti-lag has a dedicated user adjustable boost limiter to avoid unnecessary engine stress while engaged. WMI integration is able to hold boost levels low UNTIL fluid is flowing adequately to prevent spool up and transitional knock, adjust your boost target if the fluid being injected turns out not to be as potent as was expected or required to prevent knock, and in the event of a fail-safe depending on the severity of the situation either lower your boost target partially OR instantly dump boost out the diverters/close the throttle/cut timing. These are just some of the many examples of why having add on boxes an features all integrated through a single system is advantageous.

6) The JB4 is widely used and widely supported including free unlocked back end flash maps and custom mapping support from BMS via the n54tech support forum. BMS sponsors and attends several 1/4 mile and 1/2 mile races per year continuously improving the JB4 base maps and features based on real world experience and feedback. These updates are provided free of charge to JB4 customers via n54tech firmware posts.

7) The JB4 hardware is robust, reliable, highly developed, and upgradable, with many thousands of systems in use since 2008 when it was first released. The key to the JB4ís success is that it DOES NOT replace the factory engine computer or DME. The JB4 simply adds on to functionality already provided by the DME. As a result the DME remains in full control of your engine at all times with the JB4 dynamically making small but impactful adjustments to add in extra safety systems and features and dramatically improve performance.


When loading the BEF and selecting menu 4/2 in dash, the JB4 maps change to the following

Map1: 15psi
Map2: 17psi
Map3: Progressive WMI target up to 25psi based on meth flow and boost additive
Map4: 8psi, factory boost levels/VALET
Map5: Autotuning (unchanged)
Map6: Custom
Map7: 20psi


MHD is a paid DME flashing system, similar to the free BimmerBoost software, Cobb, HP Tuners, and OpenFlash, only instead of flashing with your laptop computer or a handheld device, you flash using your smart phone. To use MHD you will need an MHD Wifi adapter and a MHD software license. While MHD can be used as a stand alone flashing system when used in conjunction with a JB4 you get a much higher level of functionality, safety, and features. MHD has a per VIN license fee.

To use MHD purchase only the $79 "load a backend flash" option. You do not need to purchase any MHD map packages or logging packages. Just copy the map templates maps to your device root directory to load.

MHD Software:

Wifi Adapter:

Back End Flash Map Templates

All the maps are included in to a single download file named by release date. Maps are organized by the file name using the specifications below and can be adjusted using 3rd party TunerPro software as needed for your racing application.

JB4_[software version]_[fuel type]_[ST if for single turbo]_[PI if intended for port injection or TBI systems]_[TS for twin scroll single turbo kits]_[KR if knock sensors have been desensitized].bin

Software Version: IJE0S for MSD81 (most 2008 and newer cars), I8A0S for MSD80 (most 2007 and early 2008), INA0S for 335is models, and IKM0S for 1M models.

Fuel Type: PUMP is suitable for pump gas fuels and up to 30% E85, RACE has more aggressive timing curves best used with higher octane fuels, while E85 has timing and air/fuel ratios best suited to E40 and higher mixtures.

PI: These maps have have decaying fuel scalars meant to be used with port injection and/or WMI applications where additional fuel is being injected.

ST: This designates maps that are intended for single turbo applications. They run load, timing, air/fuel, and VANOS curves optimized for single turbos.

KR: This designates maps that have altered knock sensor sensitivity tables. We've found the platform highly susceptible to false knock, timing drops on higher octane fuels, particularly post shift, and desensitizing the knock sensors will reduce this tendency and improve performance. Alternatively the [KR] changes also increase the risk of engine damage if running the map outside of its octane/boost requirements and/or if actual knock occurs. Note this is now a flash time option that can be applied to any BEF map when flashing via the MHD flash a back end map option.

THR: For single turbo applications these maps have more aggressive gas pedal mapping.

FLEX: For those running a Fuel-IT or Motiv flex fuel sensor that is attached to the ECU these maps allow more seamless automatic tuning between different E85 mixtures.

Current BEF templates

Download the most current MHD TunerPro XDF definition files here:

Burger Motorsports
Home of the JB4 the worlds most popular turbocharged tuning system!

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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