Mercedes C300 / C400 / C450 / C43 W205 JB4

[RS408]

Does this work ?

[RS408]

Wow.. its saying that my file is to big ?

Can I shoot you an email instead? Lmk message me

[RS408]

Which parameters need to be selected?

[mike1123]

Hey Terry, mind checking out my Map 2 log? Want to make sure everything looks good. Running 93 octane.

[cuttaE400]

2015 E400 just installed BMS & JB4

I’ve used JB4 on my VW Golf R with good results so I decided to get one for my 2015 E400 (37,000km).

I installed the JB4 without a hiccup but the BMS intakes were tricky as the supplied heat shields didn’t fit in the locations as per instructions. Maybe because it’s an Australian model there are some variables, the bolts on the sides of the engine back were about an inch out on one side and the left had a bracket holding a battery cable, but after a little modifying they will work but not a perfect fit.

In Australia we have pump 98 Octane fuel so I’m starting on Map 2 and will work up to Map 5 once I install the OBD cable and can send logs to be safe.. I ran out of time as I spent 4 hours fitting the heat shields.

Map 2 runs there is a clear increase in performance and appears to drive like OEM, as it didn’t with my 2016 VW Golf R.

The E400 is a luxury performance car, at 245kw 480nm standard it’s feels heavy under acceleration, but with he JB4 on Map 2 has already made it feel much lighter and I assume that’s due to the power increase.

My questions to TERRY @ BMS:
Does anyone have any peak numbers for reference with regards to performance gain?
What are the differences between E400 and C43 engines specs
Is 98 Octane Fuel high enough for map 4/5
The cable not used on this application on the JB4, what is that for and where would I plug it if I wanted to use it?

(LOG)
WOT in 2nd gear went sideways and I **** myself! Then into 3rd clean...
Thanks

Cheers
Adam

[DubVBenz]

I'm running map 4 on 93 octane here in the states on my 2015 E400 with no other mods or issues, and have been doing so for well over a year. In the past I've tried map 5, but that might have been before BMS adjusted it.

Yours must be RWD if you've gotten sideways. Mine is AWD so it's pretty drama free.

[cuttaE400]

Yep its RWD, Does admin check the thread or should i email them

[DubVBenz]

Yep its RWD, Does admin check the thread or should i email them

They do but not as frequently as email. This thread has died off in popularity in the last year.

[Terry @ BMS]

If you need a faster response always email us.

For log review we'd need the CSV file.

[DubVBenz]

We're having a gas supply issue where I am. I was wondering if it would be safe to run the JB4 in "Valet mode" mapping for an extended period? Trying to preserve gas and run it as efficiently as possible.

[Jryan002]

I have a 2020 E450 with the same 3L twin turbo V6 as the c amg43, will the JB4 work for my E450?

[Kileak]

Hi guys! Just recently installed my JB4 on my 2020 C43. I ran it for a week or so as I had gotten it and that was on map 1, then connected to update firmware to the "JB4_MB_C_2020_2" version, but left it on map 1.

I did not notice much from the firmware update other than now the car sometimes surges in cruise control going up inclines. It feels as if the car is making a bit more power than the cruise is expecting and it cuts off slightly. It did not do this before updating firmware.

Thought I'd let you guys know or see if anyone else has noticed this. I'm always on the same highway and always set my cruise at the same speed so it was pretty obvious that it does this now, and it's pretty much every time I go over the same hills.

I was thinking of switching to map 2 as I have 94 octane in there now and see if the surges get worse or go away but haven't done so yet.

[marcrpoirier]

Quick one for [email protected]
I currently have JB4 on my 2018 C43, can I re-install in my new 2021 C43, also should I connect Green connector to Fuel Pressure… in the 2021, will it make a difference, will be running Map 2 or Map 3. Tks

[tunerbuildr]

I just installed the JB4 with optional BCM on my 2016 C450. And have tried map 1 and 2 with no change to boost pressure as far as I can tell after viewing a graph of the csv log and boost gauge using the JB4 app while doing a 3rd gear pull. The check engine light is not on, and the car feels like it's running perfectly fine. I followed the instructions to the letter as far as I can tell, so I'm not sure what the issue is. I should also note that I updated the firmware on the jb-4 before I switched to maps one and two. I have attached the CSV log

[kccasto]

I have a 2019 C300 (refresh) with the m264. I directions for the JB4 install are for the older engine. Do you have any pics or info for the new engine connection points. I know where the MAP is, but which cable off the JB4 do I use? Is that the only one that has to be hooked up? The brown wire for the pressure sensor on the intake manifold was hard to get to on the old engine, but where is it on the newer m264?

[Vnarma]

SLC 43 Installation?

Has anyone here installed the JB4 on their SLC43 AMG? The instructions in the guide on placement, and routing the wires thru the firewall don't apply. Additionally, the only space that looks close enough to mount the unit itself is under the Brake Reservoir. The space shown on the C43 to route the OBD2 cable is occupied by the Fuse/Relay box. Engine bay is really tight, and the wiper mechanism prevents any placement behind the brake reservoir.

Input from anyone who as all ready done this in a SLC, I would appreciate to have any tips (before I take everything apart!)

[Vnarma]

Has anyone here installed the JB4 on their SLC43 AMG? The instructions in the guide on placement, and routing the wires thru the firewall don't apply. Additionally, the only space that looks close enough to mount the unit itself is under the Brake Reservoir. The space shown on the C43 to route the OBD2 cable is occupied by the Fuse/Relay box. Engine bay is really tight, and the wiper mechanism prevents any placement behind the brake reservoir.

Input from anyone who as all ready done this in a SLC, I would appreciate to have any tips (before I take everything apart!)

I found a picture of the firewall, and there is an unused plug under the brake booster. Worked great. I mounted the JB4 itself under the brake reservoir so it is heat shielded from the exhaust, and off the tray to keep it out of the water.

[Steve @ BMS/Fuel-It!]

Please delete that HUGE picture and upload a log for us to take a look at.

Thank you

[khcwang]

Terry, Im really really sorry to keep bugging you. Can you just look at the pics below and tell me how my installation was and if it was done correct? Especially the brown wire

BMS Original Installation Instructional Photo


My Engine Bay Over View AFTER installation


Position A Rainbow Wire


Position B Purple Wire


Position C Brown Wire


I was not able to completely follow your instructions with regards to where to place the JB1 unit. It seems the wall inbetween the brakeboost and engine bay is solid on the GLC43?


There is however a soft rubber patch in that area but it is uncut and would need to be cut in order for anything to be fit through there. Is that what you guys did?


Please tell me how my installation looks, and most importantly if the wires are correctly placed.

New JB4 user with C450. I am wondering how did you end up store the JB4 unit. In addition, the instruction shows the purple wire is not used and needs to be tucked away. I saw you still connected the purple wire. Can you confirm?

[khcwang]

Good news.. Was able to get a local C43 by for a little JB4 development. We've got CANbus fully up and running! It's a fairly easy upgrade from Stage1->JB4. You push out grommet in the firewall, route the OBDII (or if you want the easy way route it along the door jamb), plug in the JB4 board, plug in 2 wires in to the JB4 connector for CANbus, and you're off and running. With the JB4 the purple plug is no longer used/needed so it can be unplugged. Currently the green fuel pressure wire is also not active so if you're using it (with say a C300) then put that connection back to stock, for now.

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Hi Terry, For JB4 Gen 1 on the C450, both the purple wire and green wire is still no need to be connected? Should the plugs be put together before tucked away? Or just leave them open?

[smack1129]

any response on whether it'll work for new model?

[Cinedany]

C300 2016 pressure sensor on the intake manifold

Does anyone have a picture to where this censor is supposed to be?

pressure sensor on the intake manifold

[Terry @ BMS]

The brown connection? It's under there so hard to photo.

[marcrpoirier]

Mercedes Me Connect Ongoing Error Message

What is the ETA for the problem affecting c43 2021+, this ongoing message about Mercedes Me Connect (see attached file).

Message keeps popping on an ongoing basis while Driving .

It was reported to support a month Ago, any update, progress on this ?

Thanks

[gpouliniii]

My JB4 first graph loggings

Hey guys, Im new to this and just started using the JB4 in my 2016 C450. These are my logs in map 4 with a half tank of 93 oct and 2 gallons of E85 in it. I have an MST V2 intake and a BMS pedal tuner with one BMS BOV spacer (havent had time for passenger side yet). I was wondering what map I need to be in for the JB4 to see my mods on the car and adjust them properly? Also, since I put the MST and BOV spacer on, The burples, cracks and pops went away. Is there something I can do to get those back? Sorry for all the questions.. Im just SUPER STOKED to use this thing!

Thanks In Advance!!

[GTS Jeff]

Bump...install instructions are now a dead link. Help anyone?

[GTS Jeff]

Found it for anyone else looking. All the install guide links that are dead can be fixed by replacing domain with jb4tuned.com

[Cinedany]

Hi terry for the c300 what happened to maps 4 and 5? Is e30 not an option anymore ?

[prematureapex]

Hi Terry,

Is the 2015+ CLA 45/ GLA 45 AMG with the M133 supported?

[Maverick43]

New JB4 user with C450. I am wondering how did you end up store the JB4 unit. In addition, the instruction shows the purple wire is not used and needs to be tucked away. I saw you still connected the purple wire. Can you confirm?

Is this the right pic for a c43

[Maverick43]

Not sure how active it is here
But wondering what kind of times guys on map 6 are getting?
how much can the jb4 be dialed in to be better than map 3

[Jatt21]

Hey Everyone and Terry @ BMS , I installed my JB4 onto my Mercedes C400 today and hooked up the rev 3.7 with Bluetooth connection. I originally had it on a different C400 that I sold and just got my current C400 back from the shop. I have the app and everything but the app is not detecting the JB4, I think I am stuck on map 1 or map 0. I can’t really tell since the app is not working. Any suggestions? Can you help.

[DubVBenz]

Hi Terry @ BMS ,I have an E400 with the 333HP output version of this motor. I run the default maps with the highest boost, which are the highest intended for a 43 version of this motor. So mine starts at around 9lbs of boost max, and I can get up to 15-16 using the higher output default maps.

Given the engine is physically identical to a 43, I'm wondering if I can increase my boost to the levels a C43 would make with the higher maps. However, this would require a custom map. I'm wondering if there's a method to clone a default map and then edit certain values as a custom map.

OR , could BMS create a map intended for lower output versions of the motor to get them closer to where the C43 version ends up with maps 5 or 7? If that's not possible, could you document which values I could change on a custom map?

Thanks!

[Ginco10]

Hi Terry @ BMS ,I have an E400 with the 333HP output version of this motor. I run the default maps with the highest boost, which are the highest intended for a 43 version of this motor. So mine starts at around 9lbs of boost max, and I can get up to 15-16 using the higher output default maps.

Given the engine is physically identical to a 43, I'm wondering if I can increase my boost to the levels a C43 would make with the higher maps. However, this would require a custom map. I'm wondering if there's a method to clone a default map and then edit certain values as a custom map.

OR , could BMS create a map intended for lower output versions of the motor to get them closer to where the C43 version ends up with maps 5 or 7? If that's not possible, could you document which values I could change on a custom map?

Thanks!

I just made a post about this, did you figure it out? I can’t get mine to go past 17/18 PSI, it seems the JB4 limits power to +9 PSI max.

[NEWRX]

Terry @ BMS

Was running MAP 5 on my 2021 GLC 43 AMG this morning pulling 100% throttle on an on ramp and popped a P0087 code and went into limp mode. Any thoughts on this? I was running an E30 blend of 93 octane with 10% plus E85. My most recent map is attached.

[Maverick43]

Fuel pump error
ur not getting enough fuel into the system
I’ve gotten, and have many others, that error many many times

[Cannon @ BMS]

Terry @ BMS

Was running MAP 5 on my 2021 GLC 43 AMG this morning pulling 100% throttle on an on ramp and popped a P0087 code and went into limp mode. Any thoughts on this? I was running an E30 blend of 93 octane with 10% plus E85. My most recent map is attached.

Please upload the CSV file.
Thanks!