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Default Mercedes C300 / C400 / C450 / C43 W205 Stage1 & JB4 - 12-03-2014, 12:27 PM

This is going to be the central point of contact or our Stage1 tuner for the Mercedes Benz (W205 Model) C300 & C400.

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, LLC hereby disclaims any liability resulting from the failure to use this part in compliance with all applicable federal and state laws.

Install Guide.

The JB4 ships with map 1 selected and currently maps can only be changed with a BMS DATA cable or JB4 Mobile adapter.

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

JB4 Map Guide as of v6 firmware:
Map 0: Disables tuner
Map 1: Up to 4psi over stock peak, suitable for all 91 octane+ fuels
Map 2: Up to 5psi over stock peak, suggested for 93octane+
Map 3: Up to 5.5psi over stock peak, slightly more aggressive version of map2
Map 4: Up to 6psi over stock peak, suggested for E30+ or unleaded race gas mixtures
Map 5: Up to 7psi over stock peak, holding more boost to redline, suggested for E30+ or unleaded race gas mixtures
Map 6: User definable map, boost over stock entered on user adjustment page
Map 7: WMI (water/meth injection) progressive map for BMS FSB integration
Map 8: Low boost VALET map

Stage1->JB4 Upgrade Directions:

Installation is the same as our Q50 Stage1->JB4 upgrade detailed here:


Note firmware is for JB4 systems only (with OBDII plug installed) and not for Stage1 systems. Loading JB4 firmware to Stage1 systems will render them inoperable at best requiring you to panic email us for Stage1 firmware, and at worst requiring you to remove the tuner and send the Stage1 control board in to be reflashed.

SENT firmware is for 2019+ C300 systems where firmware version ends in //7 indicating a SENT based system.

C_2020 firmware is for 2020+ C400/C450/C43 models which has a special CANbus system relative to previous models.


1) Changed VALET mode to map8, map4 is now between map3 and map5 boost levels.
2) Increased sensor sampling rate for smoother performance.


1) Added support for optional BCM (Boost Control Module)


1) Fixed firmware bug preventing fuel pressure (green) connection from working properly. First generation harnesses (that have an unused purple connection) still must relocate the green wire in pin #20 to pin #4 using a DSUB removal tool. Note this connection remains optional and is only suggested for those running heavy E85 mixtures and high boost levels. Reference photo here:
2) Adjusted boost scaling for colder climates, should targeting during colder weather. Note, the ECU is LOAD based so the factory boost target will be lower during colder weather than warmer weather. The difference between boost and ECU_PSI should roughly equal the requested boost over stock target.
3) Added fuel trim monitoring in bank2, to go along with the existing AFR monitoring in bank2. Useful for troubleshooting fueling problems.


1) Updates to map1 and map2 to hold more boost towards redline
2) Adjusted throttle slightly during shifts
3) Fixed boost scaling/reading issue between pre and post throttle body.

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How to update firmware:

For firmware updates 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.

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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