N54Tech.com - International Turbo Racing Discussion
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Joelkswagen Joelkswagen is offline
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Posts: 28
Join Date: Sep 2019
Car: 135i
Exclamation JB4 2 Step Issues - 02-22-2020, 09:48 PM

Hello! I have done a ton of searching about this topic, read all the official threads, and I still have questions so here we are.

With all the changes that have happened with jb4 firmware updates, and install guidance for the 2 step relay there really seems to be a gap in current documentation on how to set this up. Even the manual in N54tech.com shows an outdated version of the relay. With that being said, I am 99% certain I have the relay installed properly, but it is not working as expected.

Car: BMW 135i 2008 N54

Mods:
Pure stage 2 turbos
VRSF Inlets
BMS DCI
VRSF ********* without CC
Berk Street catback
Jb4 G5 + Jb4 mobile. Latest firmware installed
BMS Backend flash , pump file
Fuel it stage 2 LPFP
Forge diverter valves
BMS Catch can
Jb4 2 step relay

I just installed the Jb4 2 Step relay (without antilag). The 2 step seems to work at the designated rpm on jb4 setting 8, however I am not seeing any flames, and it is kind of intermittent and inconsistent with where the rpm limits. What is of most concern, is that no matter where I set the 2 Step RPM, the engine will cut out completely under full throttle at about 4,000 RPM almost as if NLS is kicking in, but I don't have the clutch depressed. Foot completely off the clutch pedal. Any idea what the reason for the power cut might be?

Some questions I have:
1 Are there any particular default settings I need to turn on in Jb4 mobile for 2 step/NLS to work properly, other than speedo setting 8 RPM setting?

2. Do I need the provided green clutch wire installed? One was included with the kit so I installed it, well now I am reading on the product page "Note that we've modified the JB4 firmware recently so that the clutch wire is no longer required simplifying the installation." I am using latest firmware, so do I need to remove this wire? Can having it installed now create an issue?
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Bobbylight Bobbylight is offline
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Car: 2007 bmw 335i
Default 02-07-2021, 09:21 PM

Ever figure it out? I’m having the same problem.
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brendan brendan is offline
Brendan
 
Posts: 447
Join Date: Apr 2013
Car: 335i 2007 6spdman
Default 02-08-2021, 03:20 AM

Mine used to work perfect.

Upgraded firmware then I now have 2step working but very very mildy cuts out over 5krpm also no matter what I set menu 8. When set anything above 0 on menu 8 engine cuts out at 4krpm wot after launching.

So 2 step works but is not rapid is slowly bouncing 500rpm.
Then I launch and engine cuts out at 4krpm.
I have had menu 8 turned to 0 do I can actually drive wot past 4krpm.
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brendan brendan is offline
Brendan
 
Posts: 447
Join Date: Apr 2013
Car: 335i 2007 6spdman
Default 02-08-2021, 03:23 AM

Ive had jb4 for 8 years with all the upgrades and been on hete since 2013 and cant sort it out.

Also antilag timing adv does not recover after launching.
Its faster to just launch without it at roll racing.
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Bobbylight Bobbylight is offline
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Join Date: Nov 2020
Car: 2007 bmw 335i
Default 02-08-2021, 08:52 AM

Quote:
Originally Posted by brendan
Mine used to work perfect.

Upgraded firmware then I now have 2step working but very very mildy cuts out over 5krpm also no matter what I set menu 8. When set anything above 0 on menu 8 engine cuts out at 4krpm wot after launching.

So 2 step works but is not rapid is slowly bouncing 500rpm.
Then I launch and engine cuts out at 4krpm.
I have had menu 8 turned to 0 do I can actually drive wot past 4krpm.
Yeah thatís the same problem Iím having. I tried setting the auto shift redux to zero but that didnít fix the problem. Iíve seen a handful of people having the same problem but no solid solution. They all seem to figured it out tho so Iím gonna keep messing with it.
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Bostons335i Bostons335i is offline
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Posts: 72
Join Date: Oct 2019
Car: 08 335i
Default 02-16-2021, 02:51 PM

Ever figure it out? Installed the 2 step the other day and its not working well. The NLS sorta works, keeps the turbos spooled when activating the clutch and the throttle together revs drop. But the 2 step wont keep the setting i select in menu 8. It always goes to 4200-4400 rpms regardless whats selected for meu 8 and i dont get alot of flames or pops especially on the NLS nearly never get any pops/ backfires. I also have the mhd bog shift fix on the car im wondering if that's messing anything up. lmk!
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