loosing power when shifting gears???

xcluziv33 · 02-12-2012, 12:49 AM

Hey, hope you guys can help figure out whats going on with my car. I'm loosing power, when my car switches from 1rst to 2nd gear and 2nd to 3, strangely only that. when hitting the gas as it switches it looses thrust for a split second then comes back on. I recently installed the jb4 stage 2 about 3 weeks ago didn't have a problem until now its as if maybe the chip was glitching or something but i turned it off and its still doing it... any ideas?

Dackelone · 02-12-2012, 09:53 AM

More power = more wheel spin = DSC killing your fun.

Maybe your spinning the rear tires and seeing the yellow DSC light activate? When the light comes on the DSC ecu will first brake that spinning wheel... but if that wheel still spins, the ecu will start to cut engine power. I think this is your "problem".

xcluziv33 · 02-12-2012, 10:00 AM

It cant be because its also even when i step on gas lightly, plus i removed the chip and it still happens. But dsc definitely doesn't come on anyways something has to be wrong its not normal! =(

RnmEvo9 · 02-12-2012, 10:10 AM

Are you DCT or manual? Because all manuals lose boost in between shifts.

xcluziv33 · 02-12-2012, 10:28 AM

my car is auto, sorry i forgot to mention that.

Dackelone · 02-12-2012, 10:36 AM

What kind of tires? Winter tires?

brusk · 02-12-2012, 11:04 AM

I had a similar problem yesterday when I fast shifted from 3rd to 4th at high RPM's. It basically seemed like it stalled for about half to full second. Similar to how traction control kicking in would but I had DTC off.

TunedM2C · 02-12-2012, 02:51 PM

Boost leak?

xcluziv33 · 02-13-2012, 08:38 PM

My car said that it overheated today and i had to pull over for a while, can it be that i need antifreeze and my car isnt telling me?

Mariobro34 · 02-29-2012, 12:32 PM

I have the same problem but it only happens once in a while :/

Fundahl · 02-29-2012, 01:29 PM

Sounds like really high IATs/heatsoak.

The hotter the air the longer it takes to spool because the oxygen density is lower. But autos shouldn't loose boost on the shift anyway....

Although there is a torque reduction logic programmed in to make the shifts less harsh. Maybe there is some adaptation to reset?

xcluziv33 · 03-03-2012, 04:56 PM

It was a Fuse! lol

Dackelone · 03-03-2012, 05:21 PM

Quote:

Originally Posted by xcluziv33

It was a Fuse! lol

Your power loss was bc of a fuse!?!? Please explain!

Arnold_Powers · 03-04-2012, 07:21 PM

yup subscribed

1mang · 04-26-2016, 01:28 PM

Cross posting to my thread:

http://www.1addicts.com/forums/showthread.php?t=1252277

Turns out it was my 60 amp fuse in location #92 was blown which caused my issues as similar to this thread. I hope this helps anyone in the future who comes across a similar issue as ours. Radiator fan now works when activated via the autologic program they use at shops and the unusually low power (in all gears) is gone.

Lesson here is to check fuses if you are stumped. It could be the cause of your issue all along.

iconone · 04-27-2016, 09:41 AM

I have the same problem when shifting gears. I chopped it up to being a 6mt. I know I need a blast soon.

ShocknAwe · 04-30-2016, 07:18 AM

Tuned 6MT cars are susceptible to shift bog thanks to really sensitive knock detection on N54 engines.

Not the case for the OP, but thought I would share.

02-12-2012, 12:49 AM	#1
xcluziv33 New Member 7 Rep 22 Posts Drives: 2011 BmW 135 Dr0p top Join Date: Feb 2011 Location: NyC iTrader: (0)	loosing power when shifting gears??? Hey, hope you guys can help figure out whats going on with my car. I'm loosing power, when my car switches from 1rst to 2nd gear and 2nd to 3, strangely only that. when hitting the gas as it switches it looses thrust for a split second then comes back on. I recently installed the jb4 stage 2 about 3 weeks ago didn't have a problem until now its as if maybe the chip was glitching or something but i turned it off and its still doing it... any ideas?
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02-12-2012, 09:53 AM	#2
Dackelone European Editor 10539 Rep 22,992 Posts Drives: N54 e82 Join Date: Feb 2010 Location: Bayern, Germany iTrader: (1)	More power = more wheel spin = DSC killing your fun. Maybe your spinning the rear tires and seeing the yellow DSC light activate? When the light comes on the DSC ecu will first brake that spinning wheel... but if that wheel still spins, the ecu will start to cut engine power. I think this is your "problem".
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02-12-2012, 10:00 AM	#3
xcluziv33 New Member 7 Rep 22 Posts Drives: 2011 BmW 135 Dr0p top Join Date: Feb 2011 Location: NyC iTrader: (0)	It cant be because its also even when i step on gas lightly, plus i removed the chip and it still happens. But dsc definitely doesn't come on anyways something has to be wrong its not normal! =(
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02-12-2012, 10:10 AM	#4
RnmEvo9 Banned 247 Rep 1,827 Posts Drives: 2007 335i Join Date: Apr 2011 Location: Pembroke Pines, FL iTrader: (2)	Are you DCT or manual? Because all manuals lose boost in between shifts.
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02-12-2012, 10:28 AM	#5
xcluziv33 New Member 7 Rep 22 Posts Drives: 2011 BmW 135 Dr0p top Join Date: Feb 2011 Location: NyC iTrader: (0)	my car is auto, sorry i forgot to mention that.
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02-12-2012, 10:36 AM	#6
Dackelone European Editor 10539 Rep 22,992 Posts Drives: N54 e82 Join Date: Feb 2010 Location: Bayern, Germany iTrader: (1)	What kind of tires? Winter tires?
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02-12-2012, 11:04 AM	#7
brusk Lieutenant 33 Rep 578 Posts Drives: 2008 135i Coupe Join Date: Jan 2012 Location: Cleveland, TN iTrader: (1)	I had a similar problem yesterday when I fast shifted from 3rd to 4th at high RPM's. It basically seemed like it stalled for about half to full second. Similar to how traction control kicking in would but I had DTC off.
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02-12-2012, 02:51 PM	#8
TunedM2C Brigadier General 829 Rep 4,190 Posts Drives: 2016 LBB M2 Join Date: Jan 2008 Location: Earth iTrader: (2)	Boost leak?
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02-13-2012, 08:38 PM	#9
xcluziv33 New Member 7 Rep 22 Posts Drives: 2011 BmW 135 Dr0p top Join Date: Feb 2011 Location: NyC iTrader: (0)	My car said that it overheated today and i had to pull over for a while, can it be that i need antifreeze and my car isnt telling me?
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02-29-2012, 12:32 PM	#10
Mariobro34 Private 2 Rep 83 Posts Drives: AW 135i Join Date: Jan 2012 Location: So. Cal iTrader: (1)	I have the same problem but it only happens once in a while :/
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02-29-2012, 01:29 PM	#11
Fundahl Captain 8 Rep 704 Posts Drives: VO 1M, 300zx TT Join Date: Mar 2011 Location: Corpus Christi, Texas iTrader: (0)	Sounds like really high IATs/heatsoak. The hotter the air the longer it takes to spool because the oxygen density is lower. But autos shouldn't loose boost on the shift anyway.... Although there is a torque reduction logic programmed in to make the shifts less harsh. Maybe there is some adaptation to reset?
	Appreciate 0 Quote

03-03-2012, 04:56 PM	#12
xcluziv33 New Member 7 Rep 22 Posts Drives: 2011 BmW 135 Dr0p top Join Date: Feb 2011 Location: NyC iTrader: (0)	It was a Fuse! lol
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03-04-2012, 07:21 PM	#14
Arnold_Powers that M guy 137 Rep 1,134 Posts Drives: F82 M4 Join Date: May 2010 Location: Los Angeles iTrader: (6)	yup subscribed
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04-26-2016, 01:28 PM	#15
1mang Private First Class 36 Rep 127 Posts Drives: 135i Join Date: Jun 2014 Location: Bay Area, CA iTrader: (0)	Cross posting to my thread: http://www.1addicts.com/forums/showthread.php?t=1252277 Turns out it was my 60 amp fuse in location #92 was blown which caused my issues as similar to this thread. I hope this helps anyone in the future who comes across a similar issue as ours. Radiator fan now works when activated via the autologic program they use at shops and the unusually low power (in all gears) is gone. Lesson here is to check fuses if you are stumped. It could be the cause of your issue all along.
	Appreciate 0 Quote

04-27-2016, 09:41 AM	#16
iconone Private First Class 20 Rep 172 Posts Drives: 207 swapped Wrx Join Date: Dec 2014 Location: Houston iTrader: (2)	I have the same problem when shifting gears. I chopped it up to being a 6mt. I know I need a blast soon.
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04-30-2016, 07:18 AM	#17
ShocknAwe 1Addict 3233 Rep 7,894 Posts Drives: E82 Mutt, M57 Truck Join Date: Jul 2012 Location: Charleston iTrader: (22)	Tuned 6MT cars are susceptible to shift bog thanks to really sensitive knock detection on N54 engines. Not the case for the OP, but thought I would share. __________________ 2010 135i 6MT Jet Black N54/3 FE82 Mutt \| BUILD THREAD \| GARAGE SALE
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