Issue with Jb4 need advice

K19BMW · 10-03-2013, 04:25 PM

Wasnt sure if this thread belonged in XI or N54 section so sorry if i put it in the wrong spot.

So 2 weeks ago i got and installed the JB4 G5 and BMS DCI. 99% of the time so far i have been on map 4 (stock map). I have been trying to do a few launches on map 1 just to feel the difference but the few times i have tried (3 different days and i did let the car warm up) it just jerks foward, both my left and right turn signal on my dash go on, and then feels almost like its in limp mode until i let of the gas. Im not sure whats wrong. this is my first turbo car so forgive any noobishness. anyone know what the problem is?

little info on the car. its 2008 335xi, only use 93 octane, has 45000 miles on it (got it almost 2 months ago so hasnt had any maintence from me yet), and im 100% sure that he jb4 and dci were.installed correctly.

Goldenc717 · 10-03-2013, 09:27 PM

Hold the dtc button for a couple of seconds?

stashtrey · 10-03-2013, 10:48 PM

Go to n54tech.com ...more support there

v1nc86 · 10-04-2013, 11:17 AM

JB4 support here: http://www.n54tech.com/forums/showthread.php?t=17441

By default with JB4, turn signals turn on at 6100 rpm because they act as a shift lights (no worries they turn on in your dash only).

Also, Goldenc717 has a valid point... Did you turn off traction control? You have to hold the DTC button for 3-4 seconds. Otherwise traction control will kill the power... Remember map 1/5 will give you about +100 horses.

Could you record a video? Will see what happens...

K19BMW · 10-04-2013, 03:28 PM

Quote:

Originally Posted by v1nc86

JB4 support here: http://www.n54tech.com/forums/showthread.php?t=17441

By default with JB4, turn signals turn on at 6100 rpm because they act as a shift lights (no worries they turn on in your dash only).

Also, Goldenc717 has a valid point... Did you turn off traction control? You have to hold the DTC button for 3-4 seconds. Otherwise traction control will kill the power... Remember map 1/5 will give you about +100 horses.

Could you record a video? Will see what happens...

i appreciate all the help. last night i deleted my codes (turns out i had 3. 2 involving turbos, one involving a battery sensor) and did some launches in map 4 and map 1 and i have had no problems. since i deleted the codes yesterdat i have driven about 80 miles and the only code that came back was the battery one (2E8E i think it was).

This might be real noob like but i thought the point of launching with a awd car was that you didnt need to turn off traction control because we dont really get much wheel spin?

v1nc86 · 10-04-2013, 04:20 PM

believe me, you gonna have wheel spin with a JB4 x-drive...

you just don't feel it as much as a rwd

10-03-2013, 04:25 PM	#1
K19BMW Lieutenant 112 Rep 441 Posts Drives: 2008 335xi sedan Join Date: Sep 2013 Location: Boston, MA iTrader: (3) Garage List 2008 BMW 335xi sedan [0.00]	Issue with Jb4 need advice Wasnt sure if this thread belonged in XI or N54 section so sorry if i put it in the wrong spot. So 2 weeks ago i got and installed the JB4 G5 and BMS DCI. 99% of the time so far i have been on map 4 (stock map). I have been trying to do a few launches on map 1 just to feel the difference but the few times i have tried (3 different days and i did let the car warm up) it just jerks foward, both my left and right turn signal on my dash go on, and then feels almost like its in limp mode until i let of the gas. Im not sure whats wrong. this is my first turbo car so forgive any noobishness. anyone know what the problem is? little info on the car. its 2008 335xi, only use 93 octane, has 45000 miles on it (got it almost 2 months ago so hasnt had any maintence from me yet), and im 100% sure that he jb4 and dci were.installed correctly. __________________ 2008 335xi Sedan in Monaco Blue/Beige Dakota Leather/Cold Weather/Premium Package/ Navigation/ Logic7 Alpina B3 Flash, JB4 G5, BMS DCI, BMS OCC, VRSF DP, VRSF 7" FMIC, 30% tint, matte black kidney grills, paint matched e90 spoiler, paint matched front splitter, black finishing rods, BMW OEM Blacklines, Cyba air scoops, powder coated matte black wheels, Koni + Eibachs, more to come.
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10-03-2013, 09:27 PM	#2
Goldenc717 Private First Class 7 Rep 109 Posts Drives: 2007 E90 335xi Join Date: Feb 2013 Location: Lebanon, PA iTrader: (2) Garage List 2007 BMW E90 335xi [0.00]	Hold the dtc button for a couple of seconds?
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10-03-2013, 10:48 PM	#3
stashtrey Lieutenant Colonel 295 Rep 1,834 Posts Drives: 08 E90 335xi TiAg Join Date: Dec 2012 Location: Sacramento, CA iTrader: (8) Garage List 2008 E90 335xi Sedan [0.00]	Go to n54tech.com ...more support there
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10-04-2013, 11:17 AM	#4
v1nc86 Captain 23 Rep 633 Posts Drives: 335xi Join Date: Mar 2013 Location: Montreal iTrader: (0)	JB4 support here: http://www.n54tech.com/forums/showthread.php?t=17441 By default with JB4, turn signals turn on at 6100 rpm because they act as a shift lights (no worries they turn on in your dash only). Also, Goldenc717 has a valid point... Did you turn off traction control? You have to hold the DTC button for 3-4 seconds. Otherwise traction control will kill the power... Remember map 1/5 will give you about +100 horses. Could you record a video? Will see what happens... __________________ YouTube \| 335xi Best 1/4 mile: 12.3@110 MPH \| 335xi Top speed: 0-270 kph (165+ mph)
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10-04-2013, 04:20 PM	#6
v1nc86 Captain 23 Rep 633 Posts Drives: 335xi Join Date: Mar 2013 Location: Montreal iTrader: (0)	believe me, you gonna have wheel spin with a JB4 x-drive... you just don't feel it as much as a rwd __________________ YouTube \| 335xi Best 1/4 mile: 12.3@110 MPH \| 335xi Top speed: 0-270 kph (165+ mph)
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