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JB4 (N54/N55) Support Thread, South Africa
- Thread starter Twinz
- Start date
Quick///M
Well-known member
Here is a description of the map info as for you question twins can answer it
Map Info
Map 0: JB4 disabled
Map 1: Peak boost 12.5psi, suggest for most racing applications.
Map 2: Peak boost 14.0psi, suggested for those using exhaust mods and 93 RM2 octane or higher fuels
Map 3: Progressive methanol mapping
Map 4: Stock performance, JB4 on
Map 5: Autotuning, enabled in 8.8 and later firmware
Map 6: User definable map. Suggested for troubleshooting by professionals only.
Map 7: Race gas map. Peak boost 18.5psi. Requires straight unleaded race gas.
Map Info
Map 0: JB4 disabled
Map 1: Peak boost 12.5psi, suggest for most racing applications.
Map 2: Peak boost 14.0psi, suggested for those using exhaust mods and 93 RM2 octane or higher fuels
Map 3: Progressive methanol mapping
Map 4: Stock performance, JB4 on
Map 5: Autotuning, enabled in 8.8 and later firmware
Map 6: User definable map. Suggested for troubleshooting by professionals only.
Map 7: Race gas map. Peak boost 18.5psi. Requires straight unleaded race gas.
Thanks Kish and Treschen for helping out on this thread. I am not always online. :thumbs::thumbs:
Shaun, my suggestion is to run map 5 as your daily map. If you have meth then map 3 always. I have found that the autotuning maps are much safer since tuning adjust according to changing variables such as ait's, fuel octane etc...
As Kish said, map 7 requires straight race gas or a very high octane fuel blend of witches brew or ethanol or NF concentrate. Try various high octane fuels on map 5 and log it then you can view your fuel trims, timing and AFRs before running map 7. You may also find that you make more power on map 5 then on map 7 anyway.
Shaun, my suggestion is to run map 5 as your daily map. If you have meth then map 3 always. I have found that the autotuning maps are much safer since tuning adjust according to changing variables such as ait's, fuel octane etc...
As Kish said, map 7 requires straight race gas or a very high octane fuel blend of witches brew or ethanol or NF concentrate. Try various high octane fuels on map 5 and log it then you can view your fuel trims, timing and AFRs before running map 7. You may also find that you make more power on map 5 then on map 7 anyway.
Shaun m
Inactive
Ok thanks for the info, I thought map 5 was for tuning purposes only. Will map 5 work fine with pump gas or do i need to use some e85?
These jb4's are something else, i only ran map 2 but there isnt as much power as i expected there is a slight power increase but im not battling for traction. I heard with jb alot of guys battle for traction but thats not the case for the 235i. Cant wait for map 5:thumbs:
These jb4's are something else, i only ran map 2 but there isnt as much power as i expected there is a slight power increase but im not battling for traction. I heard with jb alot of guys battle for traction but thats not the case for the 235i. Cant wait for map 5:thumbs:
Quick///M
Well-known member
Shaun m said:
Map 5 will adjust to the octane you have in the car be it pump, or other. Did you read up on the latest EWG Firmware for JB4 ? I am thinking you need to run some logs and let the expects in this thread have a look at
Treschen said:
I take that back wait for confirmation before even considering new firmware
i am currently using hex 28 with the new interface that it was designed to run on, the most benefit on the new interface will be for n54 users however other E and F series cars can also use it,
key differences are:
dual bank logging of AFR ***where supported by the engine type***
logging of all 6 cylinders with regards to ignition or retard numbers ***where supported by the engine type***
relabeling of the Future use values
format of the colums in the logs reproduced has changed slightly...
key differences are:
dual bank logging of AFR ***where supported by the engine type***
logging of all 6 cylinders with regards to ignition or retard numbers ***where supported by the engine type***
relabeling of the Future use values
format of the colums in the logs reproduced has changed slightly...
Running JB4 on N54 with DCI. Running the car on MAP 1, I find that when I am on DS and drive the car hard (town driving - robot to robot) JB4 switch my map to 4. No error codes tho. Changing DSC off, no issues and JB4 stays on MAP 1. Anything I must be concerned about? Temp is around 120deg C.
Another question, does the metal piece on the airfilter cone of the DCI get HOT?? I know the engine bay does get hot.
Another question, does the metal piece on the airfilter cone of the DCI get HOT?? I know the engine bay does get hot.
Bernard///M3
BMW Car Club Member
fsalie said:
I'm no expert but could be your Boost hitting the Boost limit, which puts into limp mode or Map4. Try increasing your Boost Limit
What version of jb software are you running. ...try and keep it updated. Know of someone who was having the same problem but with map 5, when he floored it it would switch to map4, loading hex 28 and all went away.
Chavoos
Active member
Common causes from N54 tech
The first is the over-boost safety. If boost exceeds the value you've set under user adjustment the SES light will flash once and the JB4 will switch itself to map 4 until you restart the car. The default setting is 18psi. Common causes for this are setting the value too low for the map/intended usage, improperly configured or defective wastegates, or JB4 setting problems.
The second is the run-lean safety system. If your air/fuel ratio (either bank) runs leaner than 14:1 over 4500rpm for more than a second the SES light will flash twice and the JB4 will again switch itself to map 4 until you restart the car. Common causes are maxed out fuel trims (see E85 notes above) or o2 sensor faults. Note any o2 sensor fault must be corrected for the tuning to operate properly.
Another commonly triggered fault is low fuel pressure. If your high fuel pressure drops below 7 (~800psi) the JB4 will flash the SES light three times and switch to map 4 until you restart the car. Common causes are an inadequate low pressure pump, too strong of an E85 mixture for your tuning/fuel pump, or a failing high pressure pump.
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There is also a function on the JB4 to keep DTC off all the time.
Sent from my iPhone using Tapatalk
The first is the over-boost safety. If boost exceeds the value you've set under user adjustment the SES light will flash once and the JB4 will switch itself to map 4 until you restart the car. The default setting is 18psi. Common causes for this are setting the value too low for the map/intended usage, improperly configured or defective wastegates, or JB4 setting problems.
The second is the run-lean safety system. If your air/fuel ratio (either bank) runs leaner than 14:1 over 4500rpm for more than a second the SES light will flash twice and the JB4 will again switch itself to map 4 until you restart the car. Common causes are maxed out fuel trims (see E85 notes above) or o2 sensor faults. Note any o2 sensor fault must be corrected for the tuning to operate properly.
Another commonly triggered fault is low fuel pressure. If your high fuel pressure drops below 7 (~800psi) the JB4 will flash the SES light three times and switch to map 4 until you restart the car. Common causes are an inadequate low pressure pump, too strong of an E85 mixture for your tuning/fuel pump, or a failing high pressure pump.
Sent from my iPhone using Tapatalk
There is also a function on the JB4 to keep DTC off all the time.
Sent from my iPhone using Tapatalk
I stand to be corrected. Map 1 limits boost to 11or 12 psi. Map 5 is auto learning and doesn't have those limiters in place. Using map 5 would be your best option, as it calculates the different variables and adjusts accordingly.
max is 17 psi on map 5. Constant boost over 15.
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