E90Post
 


TNT Racewerks
 
BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N54 Turbo Engine / Drivetrain / Exhaust Modifications - 335i > JB4 progressive meth mapping directions



Reply
 
Thread Tools Search this Thread
      11-29-2010, 07:48 AM   #1
Mike@N54Tuning.com
Joint Chiefs of Staff
Canada
5044
Rep
116,174
Posts

Drives: 2007 335i, 2015 M3
Join Date: Dec 2008
Location: N54tuning.com

iTrader: (89)

JB4 progressive meth mapping directions

Little JB4 update for you meth heads with some detailed directions on how to connect your progressive meth mapping. Very simple to do and a nice upgrade over the JB3 setup!

I had a chance to play with it a little this weekend and its a blast to drive

Quote:
With the JB4 we've setup a dedicated analog input specifically for methanol control. This allows a flow sensor, like the CMGS/VC2 we support, to inform the JB4 exactly how much methanol is flowing at any given moment. This flow information is included as a logging channel called "meth" and mapped in a 0-100% format. For the more advanced users 100% = 2v. The typical output is .1v per 100ml/min giving a full sweep of 0-2000ml/min.

Meth logging:

1) Connect the CMGS/VC2 orange wire to pin #15 on the JB4 DB25 connector. If you are part of the first batch of 100 alpha boards you must also connect a ~20k resistor in the wire to protect from voltage surges as the CMGS/VC2 turns on. The second alpha batch includes this resistor on the board itself. If you're unsure email in a photo of your board to ask.

2) Set your CMGS/VC2 v1.07 or higher parameter #12 (5V output mode - orange wire) to 0. Enabling it to output .1v per 100ml/min of flow. If you are using an alternative flow sensor consult with your flow sensor vendor for the appropriate settings. If you are using a previous version of the CMGS/VC2 you will need to upgrade it to 1.07 or higher to take full advantage of this feature. Firmware v1.07 has been designed specifically for progressive methanol mapping and that feature was not included in their 1.06 and previous firmware. CM offers a mail in firmware update program. Email info@coolingmist.com for details.

3) Using a normal map (1 or 2) do a series of WOT pulls with your meth enabled and observe the meth parameter in the logging software to ensure proper movement. With X scaling set to 100 note the highest percentage observed.

Progressive mapping:

Our alpha progressive mapping systems allows the JB4 to smoothly and precisely raise boost and related tuning as a function of methanol flow. You define how much boost can be increased by and what methanol flow is required before boost will be increased, and the JB4 increases boost as a linear function of methanol flow. If flow exceeds 2000ml/min an overflow failsafe is automatically triggered.

To enable progressive mapping:

1) Under the methanol tab set the "meth additive PSI" to the desired boost increase at full flow. A suggested starting point is 4psi. Note this field is currently not a decimal so you will need to enter 40 for 4psi, 35 for 3.5psi, etc. We will correct this in a future interface release. In addition we plan to add an autotuning function for this field in the future which will determine the appropriate boost increase based on timing and other DME feedback.

2) Boost is added on top of the map 1 boost curve which is 13psi peak. So a value of 40 will provide 17psi peak. Peak boost is also subject to the boost limit set under user adjustment. If the base map plus your methanol additive add up to more than the boost limit you have defined the JB4 will automatically limit the boost target to 1/2psi less than your defined boost limit during operation.

3) Fill in the "meth flow max" with something slightly lower than your maximum methanol flow. For example if you are seeing 40-45 you may want to select 40 here. This represents the point at which the JB4 will assume you are at your maximum flow and deliver the full meth additive boost increase. In the examples below with an M8 nozzle I'm seeing around 40% during max flow which corresponds to approx 800ml/min. The actual meth flow may be higher or lower than the voltage reading unless you carefully calibrate your flow sensor. Something most never do. So don't get too wrapped up in the actual voltage unless troubleshooting a specific problem or it's way off.

4) Progressive methanol mapping is only active when map 3 is selected.

Old school:

For those of you who want an intermediate solution before you can upgrade your pre 1.06 CMGS/VC2, or for those using an alternative that provides only a simple high/low signal, we've made the JB4 backwards compatible. Entering a value of 1 under "meth flow max" will revert to JB3 logic where voltages higher than 2v will add the full boost additive.

Attached are a few logs I took tonight playing around with the settings. The first log is shows adaption testing along with the meth flow in action, second is a series of runs where I disabled the methanol physically half way through the log, and the last is manually reducing the methanol flow using the controller settings and the JB4 changing it's target accordingly.
Attached Images
    
Appreciate 0
      11-29-2010, 08:55 AM   #2
Clap135
Brigadier General
Clap135's Avatar
105
Rep
3,460
Posts

Drives: 2009 N54
Join Date: Jul 2009
Location: Sticky's Mom House

iTrader: (1)

Is it just me or does it take some time to hit the boost target after each shift?
Appreciate 0
      11-29-2010, 12:14 PM   #3
Mike@N54Tuning.com
Joint Chiefs of Staff
Canada
5044
Rep
116,174
Posts

Drives: 2007 335i, 2015 M3
Join Date: Dec 2008
Location: N54tuning.com

iTrader: (89)

Quote:
Originally Posted by Clap135 View Post
Is it just me or does it take some time to hit the boost target after each shift?
The logs are all single gear 3rd gear pulls with no shifts. The JB interface has a setting to include only sample points over 60% throttle to isolate the WOT runs and it just concatenates them together.

Mike
Appreciate 0
      11-29-2010, 12:48 PM   #4
Clap135
Brigadier General
Clap135's Avatar
105
Rep
3,460
Posts

Drives: 2009 N54
Join Date: Jul 2009
Location: Sticky's Mom House

iTrader: (1)

Sounds deceptive.
Appreciate 0
      11-29-2010, 12:48 PM   #5
Jonny550
Brigadier General
Jonny550's Avatar
263
Rep
4,936
Posts

Drives: 2012 550i Xdrive
Join Date: Feb 2009
Location: Jersey Shore

iTrader: (14)

?? so all 3 of those logs are data from a 1 gear pull?

so it logs then stops and relogs? iam kind of lost here.
__________________
[SIGPIC][/SIGPIC]

.
Appreciate 0
      11-29-2010, 12:50 PM   #6
Clap135
Brigadier General
Clap135's Avatar
105
Rep
3,460
Posts

Drives: 2009 N54
Join Date: Jul 2009
Location: Sticky's Mom House

iTrader: (1)

Quote:
Originally Posted by Jon335iFL View Post
?? so all 3 of those logs are data from a 1 gear pull?

so it logs then stops and relogs? iam kind of lost here.
lol, let me know when you need help finding your way.
Appreciate 0
      11-29-2010, 01:26 PM   #7
Mike@N54Tuning.com
Joint Chiefs of Staff
Canada
5044
Rep
116,174
Posts

Drives: 2007 335i, 2015 M3
Join Date: Dec 2008
Location: N54tuning.com

iTrader: (89)

Quote:
Originally Posted by Jon335iFL View Post
?? so all 3 of those logs are data from a 1 gear pull?

so it logs then stops and relogs? iam kind of lost here.
You guys have never used the "show WOT only" button in the JB3? It prunes the data down to wide open throttle activity only to save you having to scroll through minutes off throttle data. For example in normal view would look like the first. You can also stretch the Y axis out to 30 seconds and scrunch the runs in.

Mike
Attached Images
  
Appreciate 0
      11-29-2010, 03:52 PM   #8
tscdennab
Banned
156
Rep
1,809
Posts

Drives: BMW 335i
Join Date: Oct 2010
Location: Europe

iTrader: (0)

Garage List
2008 BMW  [6.24]
I think it's a very nice feature. Now you can have a complete analysis tool.
Appreciate 0
      11-29-2010, 04:33 PM   #9
GotBoost?
Banned
GotBoost?'s Avatar
22
Rep
314
Posts

Drives: fast
Join Date: Oct 2010
Location: East Coast

iTrader: (3)

mike how do i place my order? for the jb4 please pm the info,
Appreciate 0
      11-29-2010, 08:50 PM   #10
Mike@N54Tuning.com
Joint Chiefs of Staff
Canada
5044
Rep
116,174
Posts

Drives: 2007 335i, 2015 M3
Join Date: Dec 2008
Location: N54tuning.com

iTrader: (89)

Quote:
Originally Posted by GotBoost? View Post
mike how do i place my order? for the jb4 please pm the info,
The simplest way is to just order the JB3 now, as all new JB3s come with a FREE upgrade to JB4. We will send you a free JB4 once its out or you can just wait for the JB4 to come out and place the order then.

http://www.e90post.com/forums/showthread.php?t=432536

Mike
Appreciate 0
      11-29-2010, 08:52 PM   #11
dlbrooks18
Brigadier General
dlbrooks18's Avatar
164
Rep
3,735
Posts

Drives: e90 335i
Join Date: Nov 2008
Location: Los Angeles

iTrader: (2)

very cool!
__________________

2008 E90 335
Appreciate 0
Reply

Bookmarks

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off



All times are GMT -5. The time now is 10:15 AM.




e90post
Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2024, vBulletin Solutions Inc.
1Addicts.com, BIMMERPOST.com, E90Post.com, F30Post.com, M3Post.com, ZPost.com, 5Post.com, 6Post.com, 7Post.com, XBimmers.com logo and trademark are properties of BIMMERPOST