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E90/E91/E92/E93 (2006 - 2013)
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  #1  
Old 07-23-2014, 03:37 PM
eva020100 eva020100 is offline
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Location: New Jersey
 
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Mein Auto: Bmw 335 e92
jb4 with ecu flash explanation?

Ive seen a ton of threads about jb4 vs cobb and ive seen some about the jb4 with a back end flash for added power. Can someone explain how a custom flash works with the jb4? Does the flash work on all of the jb4 maps and make them "better" or just on map 0. I already have a cobb and im just wondering what kind of gains i could get with a flash already installed and a jb4 added
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  #2  
Old 07-23-2014, 04:29 PM
unrealii unrealii is offline
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Mein Auto: 2009 335 6MT 'vert
It lets the DME control timing and the jb4 control boost

http://www.n54tech.com/forums/showthread.php?t=20563

http://www.n54tech.com/forums/showthread.php?t=21382
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Old 07-23-2014, 05:18 PM
eva020100 eva020100 is offline
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Location: New Jersey
 
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Mein Auto: Bmw 335 e92
do you know if adding the jb4 gives much of a hp boost over just the cobb flash number wise?
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  #4  
Old 07-23-2014, 05:36 PM
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Verts4Ever Verts4Ever is offline
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Location: Phoenix West Valley
 
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Mein Auto: 2011 E93 335i
Depending on your engine, I recommend you search through the N54 or N55 mods forum over on E90Post... http://www.e90post.com/forums/

Lots of Cobb vs. JB4 posts there, and folks will be happy to answer your questions if you've done some research beforehand.

Cheers.

Last edited by Verts4Ever; 07-23-2014 at 05:38 PM.
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Old 07-25-2014, 02:11 PM
mike@x-ph.com mike@x-ph.com is offline
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Mein Auto: FBO 07 e92 335i
As explained above the jb4 flash controls timing,afr,and fuel scalar while the JB4 controls boost.
Cobb maps are very conservative so jb4 (without the flash ) will give you more power than cobb(OTS maps). Add the jb4 flash and it is not even close.
Of course you can get the cobb to produce as much power but u will either need tuning experience or have to pay couple hundred $ for someone to tune it for you.

the jb4 flash works on all maps even map 0.
you can also get the cobb and jb4 to work together.

hopefully i have answered all your questions


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