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2010 2011 BMW 5 Series Forum F10 F10 Technical Topics Engine, Transmission, Exhaust, Drivetrain, ECU Software Modifications How to downgrade Jb4 to Jb3?
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      12-04-2012, 01:46 PM   #1
obiltagi3
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How to downgrade Jb4 to Jb3?

So unfortunately i am unable to use the Stage 2 Jb4 and am forced to downgrade to Stage 1. How can i do this? I purchased it from my brother so its not like i can return it for the downgrade. Is there a way to downgrade it?

If not, is someone looking to upgrade their jb3 to jb4

Orange County area

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      12-04-2012, 01:48 PM   #2
///M ARMY
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why can you use the stage 2?
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      12-04-2012, 01:50 PM   #3
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I guess i do not have the right connections for it in my car? I feel kind of iffy about my car not having the right wires.
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      12-04-2012, 07:14 PM   #4
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JB3 is an old tune for an N54 powered car. You want to go from stage 2 to stage 1.
You are in so cal. If you reach out to terry you should be able to get a correct one quickly. Hell I remember when I lived in So Cal, I would just reach out to Terry and head up to the valley to get things taken care of immediately. Customer service at it finest!
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      12-06-2012, 01:25 PM   #5
omer
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The Jb is for f10? I just returned my 335i and I have the jb3 if you want we can trade?
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      12-06-2012, 01:41 PM   #6
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Quote:
Originally Posted by omer View Post
The Jb is for f10? I just returned my 335i and I have the jb3 if you want we can trade?
The OP is confused. He is referring to the BMS N55 stage 1/Stage 2 tune.

JB3 is for the N54 and he has the N55.
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      12-06-2012, 01:55 PM   #7
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Quote:
Originally Posted by RambleJ View Post
The OP is confused. He is referring to the BMS N55 stage 1/Stage 2 tune.

JB3 is for the N54 and he has the N55.
Just to be fair, when I got my stage 1 in the spring it was still listed as JB3. So I have a tendency to refere to my stage 1 as a JB3 also because that is what it was called then.

From my order:

Product
Model Year/Build Date - 2010 - Jan 2011 (Harness A)

Product Code
JB3B1

Qty
1
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2011 535i xDrive, Dark Graphite Metallic, Veneto Beige Dakota Leather, Technology Package, M Sport Package, Executive Package delivered Christmas Eve '10, Mods - quad tips, 20% tint, JB4.

Last edited by Sharbotcom; 12-06-2012 at 02:10 PM.
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