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milkdi milkdi is offline
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Default JB4 as Meth Controller Only - 02-04-2018, 02:14 AM

Hello all,


Is it possible to use JB4 as a meth controller only?

To control the flow only based on rpm, can I connect the OBD CANBUS only and disconnect the other cables (Boost, TMAP, PWG and FF)?

I suppose I can use map6 to do this, correct?


Thanks in advance
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Default 02-07-2018, 06:16 PM

Sure, you can do that with map6. Just enter 0 under the boost targets and the JB4 will use the flash maps targets.


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eligard eligard is offline
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Default 02-11-2018, 11:36 PM

Good reference on the use of map6.
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Aekdbrich Aekdbrich is offline
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Default 02-20-2018, 10:17 PM

Quote:
Originally Posted by milkdi
Hello all,


Is it possible to use JB4 as a meth controller only?

To control the flow only based on rpm, can I connect the OBD CANBUS only and disconnect the other cables (Boost, TMAP, PWG and FF)?

I suppose I can use map6 to do this, correct?


Thanks in advance
Most definitely you can do this. I have a friend with an F82 who runs the JB4 as a meth controller only, but uses bootmod3 for the rest.

He uses Map 6, sets all the boost values to 0, and all the other connections are not removed. You can still use the CanBUS features as well, such as the exhaust flap, gauge sweeps, boost gauge hijack on fuel gauge, and code reading.

Hope this helps!
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Default 04-19-2018, 03:33 AM

Quote:
Originally Posted by Aekdbrich
Most definitely you can do this. I have a friend with an F82 who runs the JB4 as a meth controller only, but uses bootmod3 for the rest.

He uses Map 6, sets all the boost values to 0, and all the other connections are not removed. You can still use the CanBUS features as well, such as the exhaust flap, gauge sweeps, boost gauge hijack on fuel gauge, and code reading.

Hope this helps!
When using JB4 like this does it still have ability to dump boost if poor meth flow is detected?
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Aekdbrich Aekdbrich is offline
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Default 04-19-2018, 06:24 PM

Quote:
Originally Posted by CT_Drifter
When using JB4 like this does it still have ability to dump boost if poor meth flow is detected?
I believe so. All the safeties are still active, so it should dump boost and kick a safety in.

I'm not 100% sure on that though.
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Default 04-19-2018, 07:30 PM

There are different settings but if setup properly it can drop WGDC during a failsafe event, which is effectively the same thing. That's the meth safety = 5 setting.


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stangkillin99ss stangkillin99ss is offline
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Default 05-05-2018, 09:34 AM

so in this setting would I not need a back end flash?
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Default 05-05-2018, 12:53 PM

Quote:
Originally Posted by stangkillin99ss
so in this setting would I not need a back end flash?
Back end flash maps are always optional.


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stangkillin99ss stangkillin99ss is offline
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Default 05-06-2018, 07:54 AM

This is excellent I’ve been looking for this info for quite a while. I’ve looked up many stickies and this exact info is never there. Maybe you can add this in.

So for reference to use JB4 to control meth only, leave all connectors connected as if it were controlling everything. Set to map 6. Make all boost target levels zero. And viola?
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Osiris Osiris is offline
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Default 09-20-2019, 03:53 PM

I know this is from last year, but if doing this and I put a full flash do I need to disconnect the white connector or can I leave all the jb4 plugs, plugged in as is and just set menu option 4/4?

Then set map to 6 all boost set to 0 and meth safety = 5 ?
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Default 09-22-2019, 04:22 PM

Quote:
Originally Posted by Osiris
I know this is from last year, but if doing this and I put a full flash do I need to disconnect the white connector or can I leave all the jb4 plugs, plugged in as is and just set menu option 4/4?

Then set map to 6 all boost set to 0 and meth safety = 5 ?
This is an N20 thread.


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Default 09-24-2019, 07:18 AM

Are there presently any back end flash maps that are compatible with BM3 or are we waiting for the MHD tools to support the N20 platform?
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Default 09-24-2019, 10:10 AM

BMS hasn't been able to make any N20 specific maps yet as we're waiting for MHD. But any N20 flash map can be used as a back end flash.


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Default 09-24-2019, 11:26 AM

Quote:
Originally Posted by Terry @ BMS
BMS hasn't been able to make any N20 specific maps yet as we're waiting for MHD. But any N20 flash map can be used as a back end flash.
I'm sure this would be outside the scope of my knowledge at the moment, but could you point me in the right direction as to how to change a flash map into a back end flash? Or is that a question better asked to PTF?

I presume it's a matter of editing the boost settings in the BM3 editor?
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Default 09-26-2019, 05:13 PM

For the N20 we don't have BEF specific maps so any flash map will do.


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Default 09-27-2019, 12:43 PM

Quote:
Originally Posted by Terry @ BMS
For the N20 we don't have BEF specific maps so any flash map will do.
Sorry, I may be misunderstanding.

The difference between a Backend Flash vs just a Flashed DME is that with a Backend Flash you are having the tuning platform (MHD/BM3) load a flash onto the DME that alters tunes for various systems of the car besides boost which is totally controlled by JB4.

With a Flashed DME such as using BM3 with Stage 2 OTS map, I can then set the Jb4 to Map 3, and the Jb4 will control the boost as well as methanol injection without issue? So the best of both worlds?
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Default 09-27-2019, 01:03 PM

Correct... Once flashed it log it and we can evaluate based on the specifics of the flash map being used.


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