JB4 Issue

alexx03 · 09-17-2012, 11:00 PM

Seem to be having issue with my jb4 system.
Not getting any codes and i have checked all the connectors twice already and they are all fully connected.
Sometimes when I start the car and I go for a spirited drive the car will not boost fully. I am on map 2 and it will barley hit 10psi and you really feel the difference.sometimes switching to map 1 and back to map 2 fixes it,sometimes I have to go to map 0(power off the jb4) and then back to map 2 and the issue is fixed. Sometimes neither of those tricks work and I need to turn the car off and turn it back on. Basically I just play around until it goes back to normal.
Let me know what you think
Thanks guys

Dr. G · 09-18-2012, 12:47 AM

Do you have any logs from when this happens?

Shoot Terry an email, his customer service is top notch.

alexx03 · 09-18-2012, 02:19 AM

i sent terry an email but it says he is out until Wednesday, i dont have a log because it only happens randomly and dont always have my laptop in the car.

nemo07 · 09-18-2012, 11:15 AM

Check the Overboost Safety PSI. What is it set at? I overboosted one time and JB4 shut off until I shut down my car and started it back up again.

Another cause for having very low boost is a leak somewhere within your piping. Check the chargepipe and intercooler piping, make sure that the connections are sealed and tight.

alexx03 · 09-18-2012, 04:35 PM

installed a ER chargepipe and bov today so maybe that was the problem with the stock chargepipe being lose somewhere.
problem is i made the stupid mistake of breaking the nipple off the intake manifold....need to fix this first before continuing on with this problem.
thanks for the suggestions anyways

09-17-2012, 11:00 PM	#1
alexx03 Lieutenant 19 Rep 432 Posts Drives: 2007 BMW 335I Join Date: Jun 2012 Location: Vaughan iTrader: (2)	JB4 Issue Seem to be having issue with my jb4 system. Not getting any codes and i have checked all the connectors twice already and they are all fully connected. Sometimes when I start the car and I go for a spirited drive the car will not boost fully. I am on map 2 and it will barley hit 10psi and you really feel the difference.sometimes switching to map 1 and back to map 2 fixes it,sometimes I have to go to map 0(power off the jb4) and then back to map 2 and the issue is fixed. Sometimes neither of those tricks work and I need to turn the car off and turn it back on. Basically I just play around until it goes back to normal. Let me know what you think Thanks guys
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09-18-2012, 12:47 AM	#2
Dr. G Major General 287 Rep 5,064 Posts Drives: Black e92 335i Join Date: Apr 2010 Location: Brampton, Ontario iTrader: (32) Garage List e92 BMW 335i [8.84]	Do you have any logs from when this happens? Shoot Terry an email, his customer service is top notch. __________________ JB4 / OSS Angel Eyes / Downpipes / F1-Racewerks FMIC / Custom Meth Kit / BMS DCI / ER Chargepipe / HKS BOV / BMS Meth Elbow / BMW Performance Exhaust / Carbon Fiber Inlay Quad Tips / 19" Miro 111 / Front Aero Lip / M3 Sides / VRS CSL Trunk / Mtech Rear / DD CF Quad Finned Diffuser / LCI Tails / BBK / Smoked Reflectors / F1 Euphoria LED Interior / License LED's / GT 5000k Corners / 5000k HID Fogs / Air Scoops / LED Turn Signals / FK Silverline Coilovers / HPA endlinks / Vibrant Resonators / Osram CBI 5000k D1S
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09-18-2012, 02:19 AM	#3
alexx03 Lieutenant 19 Rep 432 Posts Drives: 2007 BMW 335I Join Date: Jun 2012 Location: Vaughan iTrader: (2)	i sent terry an email but it says he is out until Wednesday, i dont have a log because it only happens randomly and dont always have my laptop in the car.
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09-18-2012, 11:15 AM	#4
nemo07 JBC 35 Rep 310 Posts Drives: E92 AW 335i Join Date: Jun 2010 Location: Mississauga iTrader: (2) Garage List 2007 BMW 335i [0.00]	Check the Overboost Safety PSI. What is it set at? I overboosted one time and JB4 shut off until I shut down my car and started it back up again. Another cause for having very low boost is a leak somewhere within your piping. Check the chargepipe and intercooler piping, make sure that the connections are sealed and tight. __________________ Cobb Protune (PTF), HFS-4 Meth Kit, DCI, PTF Twin Disk Clutch, Raceland DP's, OCC, F1 Racewerks IC, ER Charge Pipe, Forged DV's, CSL Rep Trunk, Aero lip, Mtech Rear, Custom Ground Control Coilovers, 235/35/19 275/30/19, Quaife LSD, Diff Lockdown Kit, DSS Half Shafts, M3 subframe bushing, M3 Rear Sway Bar
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09-18-2012, 04:35 PM	#5
alexx03 Lieutenant 19 Rep 432 Posts Drives: 2007 BMW 335I Join Date: Jun 2012 Location: Vaughan iTrader: (2)	installed a ER chargepipe and bov today so maybe that was the problem with the stock chargepipe being lose somewhere. problem is i made the stupid mistake of breaking the nipple off the intake manifold....need to fix this first before continuing on with this problem. thanks for the suggestions anyways
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