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-   Mercedes C250, C300, C43, AMG (https://www.n54tech.com/forums/forumdisplay.php?f=38)
-   -   Mercedes C300 / C400 / C450 / C43 W205 JB4 (https://www.n54tech.com/forums/showthread.php?t=28003)

Terry @ BMS 12-03-2014 12:27 PM

Mercedes C300 / C400 / C450 / C43 W205 JB4
1 Attachment(s)
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 http://www.burgertuning.com/terms.html

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: http://www.n54tech.com/flash_files/Q...B4_UPGRADE.pdf


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: https://www.n54tech.com/forums/attac...1&d=1539975810
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.

Default Settings:

Attachment 95432

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.

Ando @ BMS 12-03-2014 12:54 PM

Terry @ BMS 12-03-2014 09:16 PM

3 Attachment(s)

For those looking to push things a little more we have the optional BCM module which is compatible with C400 and C43 models. We expect many 2019 C43 models which are running a little less boost from the factory will benefit from it.

Order here: https://www.burgertuning.com/product...control-module

Installation directions:

1) Update the JB4 to v4 or newer firmware. On the user adjustment page default FF to 100 and duty bias to the profile shown:

Attachment 87509

2) Open hood, lock doors, hide the keys, and wait for 5 min to ECU to go to sleep. Alternatively you can just disconnect the negative battery terminal in the trunk.

3) Attach the blue control wire to pin#1 on the JB4 connector. To do this you'll need to open the JB4 enclosure, run the pin carefully through the rubber grommet, and plug it in to the spot with the #1 next to it. Once inserted it's not possible to remove without a special tool (DSUB removal tool) so check twice before inserting it.

4) Attach the BCM ground fork to a suitable chassis ground.

5) Route the BCM solenoid connections over to the solenoid on the passenger side of the engine under the snorkel and plug it in similar to the other JB4 connections.

6) Once installed and updated grab a short log and post it to this forum or email it in so we can confirm it's working as expected.

rustyminded 12-04-2014 09:21 AM

can't wait to see this against JB4 N20 :popcorn

musc 12-04-2014 09:41 AM

Rather have the two cars in the garage :)

Terry @ BMS 12-04-2014 09:57 PM

2 Attachment(s)
OK some good progress has been made the last couple of days. I have control over everything we need to successfully tune the vehicle.

The only hitch is one of the sensors is really difficult to reach. Probably a 30 minute job and a difficult one at that as there isn't much room to work with. You have to pull a few parts out and really contort your hand to get it in. Compare that to maybe 30 seconds total to install the rest of the connections which are right on top of the engine. On the plus side the tune functions nicely without the sensor giving most of the torque gains. You just don't get the power gains above 4500rpm.

We'll implement this tune similar to how we approach the M3 JB4. We'll Include all the connections on the harness and then allow end users to decide whether the torque gains from Stage1 are enough to keep them happy or whether they want to connect the devil sensor enabling Stage2 to unlock the rest of their top end power.

I was able to hit the private track for some tuned VBOX Stage2 runs on pump fuel and gains were pretty solid. 0-60 5.3s, 0-100 13.5s, 1/4 mile 13.8@101mph. Knocked a full second off the 0-100mph which was impressive. Stage1 times were a bit better than stock but with the car shifting itself around 6000rpm after the first gear you are working from a part of the power band that isn't increased much with Stage1.

Newguy123 12-04-2014 10:17 PM

impressive! Not suprised at all though, Terry; a mad scientist in his habitat creating new formulas for all the new badazz turbo machines

Ando @ BMS 12-04-2014 11:55 PM

Now that's AWESOME! :happy

Now lets get that 0-60 in 5.0seconds with some e85/race mix!

Bowser330 12-05-2014 08:06 AM

Is this a hint that you may also tune the c63 m177 ?!

Terry @ BMS 12-05-2014 08:42 AM


Originally Posted by Bowser330 (Post )
Is this a hint that you may also tune the c63 m177 ?!

I don't think we'll get involved with any of the AMG models except maybe the C450 AMG if they make one. The volume just isn't there to justify it.

JB4UK 12-11-2014 12:08 PM

same engine as the A45 AMG Terry?

Terry @ BMS 12-11-2014 12:19 PM

No idea on that but I'd like to look at some of the AMG models to check their electronics.

JonMartin 12-11-2014 09:54 PM


Originally Posted by Terry @ BMS (Post )
No idea on that but I'd like to look at some of the AMG models to check their electronics.

Its so funny I just helped my sister pick up one of these! I wish you had something for my CLS!

Terry @ BMS 12-12-2014 03:31 PM

I've been slowly becoming more familiar with the turbo MB vehicles. Have a photo of your TMAP sensor so I can check the electronics?

Terry @ BMS 12-12-2014 03:54 PM

On the C300 front testing has been doing well. We've finalized the wiring harness and are gearing up to produce 100 sets which should take 3-4 weeks. Once done we'll be ready to launch a BETA program. :)

GBX 12-12-2014 06:07 PM

any idea if this is the same engine as the GLA250? The Gla makes a lot less power stock but both are turbo 4's . Can't believe MB makes more then 1...any idea?

Terry @ BMS 12-14-2014 02:41 PM

Would need to see a photo of the engine bay to determine that.

GBX 12-15-2014 11:17 AM

decided to go with an X1 instead.....JB Stage 1 here I come :burnrubber:

Terry @ BMS 12-15-2014 11:35 AM

Good choice! :)

FoShizzle 12-15-2014 07:23 PM

My dad just picked up a C300 today. You can put me down as a beta tester.

JonMartin 12-16-2014 01:10 AM


Originally Posted by Terry @ BMS (Post )
I've been slowly becoming more familiar with the turbo MB vehicles. Have a photo of your TMAP sensor so I can check the electronics?

I'll take a pic for you soon.

Laramie_05MR 12-17-2014 03:15 PM


Originally Posted by GBX (Post )
any idea if this is the same engine as the GLA250? The Gla makes a lot less power stock but both are turbo 4's . Can't believe MB makes more then 1...any idea?

The CLA and GLA share the same engine designation 270920.

The C300's engine designation is 274920

topgun32 12-21-2014 12:01 PM


found this from Kleemann, in hopes to provide a different approach to tuning.

I just leased a C400 and looking to use your development to tune my car.

I live in So Cal (Inland Empire). In case I can be of assistance during beta testing.



Terry @ BMS 12-21-2014 12:57 PM

Drop me an email would love to check the car out.

topgun32 12-22-2014 02:03 PM


Originally Posted by Terry @ BMS (Post )
Drop me an email would love to check the car out.

Email Sent.

I have an ODB2/USB cable.

is there a program that you recommend to start data logging?

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