N54 Boost Issues After JB4 Install

N55 Jay · 10-13-2014, 09:35 AM

My buddy has 2008 335i N54. He's having problems hitting target boost at 14.5lbs after jb4 install. Current mods are just Downpipes. Car won't boost over 8.5psi. The car drives normal like stock. Any advice. The car has been checked for boost leaks and everything looks normal. He's exchanged emails with the guys at Burger tuning but no luck finding solutions. Thanks.

Roland135i · 10-13-2014, 10:16 AM

I'm not an expert, but no codes thrown?

I would:

De-install JB4 and check if all is normal and stock boost is ok.

Re-install JB4 and check again.

Still bad? Contact BMS and swap JB4

Good luck

ShocknAwe · 10-13-2014, 10:17 AM

Has he updated firmware? Is he running G4 or G5 unit? He could try doing a disaster firmware reset on the box. Do other JB4 related features work?

Does he (or you) have a BMS USB cable?

mike@x-ph.com · 10-13-2014, 12:11 PM

Codes?

Miko226 · 10-13-2014, 12:42 PM

Do you give your car time for oil temps to go over 160 degrees F? If not your car maintains stock boost until oil temps are >160 Degrees F with the JB4

ShocknAwe · 10-13-2014, 01:35 PM

Quote:

Originally Posted by Miko226

Do you give your car time for oil temps to go over 160 degrees F? If not your car maintains stock boost until oil temps are >160 Degrees F with the JB4

+1 for the obvious point that everyone probably missed.

M3to335 · 10-13-2014, 06:12 PM

Quote:

Originally Posted by ShocknAwe

Has he updated firmware? Is he running G4 or G5 unit? He could try doing a disaster firmware reset on the box. Do other JB4 related features work?

Does he (or you) have a BMS USB cable?

What the heck is a disaster reset?

ShocknAwe · 10-13-2014, 06:45 PM

Quote:

Originally Posted by M3to335

What the heck is a disaster reset?

I'm actually not sure if it's still available, but you used to be able to use a laptop to force the JB4 board back to it's factory firmware.

darkrom · 10-13-2014, 07:15 PM

What map? Map 8 by chance? That would be wastegates open I believe. No turbo mode lol

ShocknAwe · 10-13-2014, 09:46 PM

Quote:

Originally Posted by darkrom

What map? Map 8 by chance? That would be wastegates open I believe. No turbo mode lol

Map 8 would only register 1-3 psi at most.

10-13-2014, 09:35 AM	#1
N55 Jay Enlisted Member 6 Rep 35 Posts Drives: 2011 BMW 135i N55 Join Date: Oct 2013 Location: Miami iTrader: (0)	N54 Boost Issues After JB4 Install My buddy has 2008 335i N54. He's having problems hitting target boost at 14.5lbs after jb4 install. Current mods are just Downpipes. Car won't boost over 8.5psi. The car drives normal like stock. Any advice. The car has been checked for boost leaks and everything looks normal. He's exchanged emails with the guys at Burger tuning but no luck finding solutions. Thanks. __________________ 2011 BMW 135i M
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10-13-2014, 10:16 AM	#2
Roland135i Roland135i 0 Rep 32 Posts Drives: BMW E82 135i JB4 Join Date: Aug 2013 Location: The Netherlands iTrader: (0)	I'm not an expert, but no codes thrown? I would: De-install JB4 and check if all is normal and stock boost is ok. Re-install JB4 and check again. Still bad? Contact BMS and swap JB4 Good luck __________________ 03-2008 135i N54 - JB4 - DCI - BMW PE
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10-13-2014, 10:17 AM	#3
ShocknAwe 1Addict 3234 Rep 7,895 Posts Drives: E82 Mutt, M57 Truck Join Date: Jul 2012 Location: Charleston iTrader: (22)	Has he updated firmware? Is he running G4 or G5 unit? He could try doing a disaster firmware reset on the box. Do other JB4 related features work? Does he (or you) have a BMS USB cable? __________________ 2010 135i 6MT Jet Black N54/3 FE82 Mutt \| BUILD THREAD \| GARAGE SALE
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10-13-2014, 12:11 PM	#4
mike@x-ph.com Joint Chiefs of Staff 24208 Rep 190,807 Posts Drives: 07-335/12-328/18-M4/21-M4CP Join Date: Sep 2013 Location: Las Vegas iTrader: (23)	Codes? __________________ Check out our current sale by clicking on this link! https://x-ph.com/sale/ Phone number 702-494-9435
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10-13-2014, 12:42 PM	#5
Miko226 Captain 61 Rep 722 Posts Drives: 11' 335d Join Date: Nov 2012 Location: Boca Raton, FL iTrader: (0)	Do you give your car time for oil temps to go over 160 degrees F? If not your car maintains stock boost until oil temps are >160 Degrees F with the JB4 __________________ 11' m57 335d 165k Miles - JR 2, ATM Full Exhaust & Intake, Wagner FMIC, AAR Boost Pipe, AAR Swirl Delete, AAR EGR Delete 08' n54 135i FBO E85 - SOLD
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10-13-2014, 07:15 PM	#9
darkrom Colonel 188 Rep 2,226 Posts Drives: 135i Join Date: Feb 2011 Location: Rhode Island iTrader: (5)	What map? Map 8 by chance? That would be wastegates open I believe. No turbo mode lol
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