Which downpipe is bank 1?

wren57 · 04-17-2011, 05:51 PM

I think I may have swapped my o2 sensors when installing my downpipes. To figure this out, I'm going to datalog the o2 bank1 and bank2 AFRs (while at idle) with one of them disconnected. For this to work I need to know which one is which. Thanks.

momstmg78 · 04-17-2011, 05:56 PM

I would think bank 1 is the front turbo

ianthegreat · 04-17-2011, 06:00 PM

What symptoms is your car exhibiting? Mine were swapped and had to go through this whole deal.

dzenno · 04-17-2011, 06:18 PM

Front turbo bank 1

wren57 · 04-17-2011, 08:05 PM

Is that the one that connects to the drivers side midpipe? Because I can't see which one connects to the front turbo with the underpan still mostly on.

wren57 · 04-17-2011, 08:14 PM

Quote:

Originally Posted by ianthegreat

What symptoms is your car exhibiting? Mine were swapped and had to go through this whole deal.

Oscillations in power at high speeds on cruise control, especially when going downhill. Not huge, but noticeable. I also have boost jumping around under heavy (but not WOT) throttle and stuttering when lugging the engine. I'm finally getting a tool to change the spark plugs Wednesday, hoping that'll clear up some of it as well.

Clap135 · 04-17-2011, 08:27 PM

instead of messing with that, just makes sure the black o2 sensors are in the front turbo downpipe and the gray ones are in the rear turbo downpipe

wren57 · 04-17-2011, 08:47 PM

Just checked. Both black wires are on the longer downpipe. Hmm. I wonder what is causing the oscillations. I have no codes (even when stuttering), did the v5 harness upgrade and am running the 3-15 FW/Maps. Should my o2 modifier be set to any specific value or is it irrelevant with canclear on?

dzenno · 04-17-2011, 09:16 PM

Quote:

Originally Posted by wren57

Is that the one that connects to the drivers side midpipe? Because I can't see which one connects to the front turbo with the underpan still mostly on.

Yes it is...driver's side pipe is bank1

psu139 · 04-17-2011, 10:54 PM

I had what sounds to be the same problem a while back. No codes and mostly felt it on cruise control. Turned out to be an injector. Had it replaced and no trouble since.

Maddawg58 · 04-18-2011, 07:40 AM

I had the same thing, installed the BMS o2 sim, problem solved...smoothed the car right out, plugged it into the v5 harness

FedeM · 04-18-2011, 07:41 AM

FRONT.

wren57 · 04-18-2011, 09:21 AM

Quote:

Originally Posted by Maddawg58

I had the same thing, installed the BMS o2 sim, problem solved...smoothed the car right out, plugged it into the v5 harness

Yeah, I just find it ridiculous to have to buy something else with the v5 plugged in already.

04-17-2011, 05:51 PM	#1
wren57 Roll Tide 591 Rep 2,345 Posts Drives: 335i Join Date: Jul 2010 Location: St Louis iTrader: (10)	Which downpipe is bank 1? I think I may have swapped my o2 sensors when installing my downpipes. To figure this out, I'm going to datalog the o2 bank1 and bank2 AFRs (while at idle) with one of them disconnected. For this to work I need to know which one is which. Thanks. __________________ Fix your broken/stripped cowl bolts with this elegant brass solution! http://www.e90post.com/forums/showthread.php?p=20230306
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04-17-2011, 05:56 PM	#2
momstmg78 Banned 12 Rep 376 Posts Drives: 335i sedan Join Date: Oct 2010 Location: Turkish's house iTrader: (0)	I would think bank 1 is the front turbo
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04-17-2011, 06:00 PM	#3
ianthegreat Colonel 60 Rep 2,314 Posts Drives: n54 Join Date: Apr 2008 Location: Pittsburgh/Houston iTrader: (1)	What symptoms is your car exhibiting? Mine were swapped and had to go through this whole deal.
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04-17-2011, 06:18 PM	#4
dzenno Banned 273 Rep 5,876 Posts Drives: Join Date: Feb 2006 iTrader: (1)	Front turbo bank 1
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04-17-2011, 08:05 PM	#5
wren57 Roll Tide 591 Rep 2,345 Posts Drives: 335i Join Date: Jul 2010 Location: St Louis iTrader: (10)	Is that the one that connects to the drivers side midpipe? Because I can't see which one connects to the front turbo with the underpan still mostly on. __________________ Fix your broken/stripped cowl bolts with this elegant brass solution! http://www.e90post.com/forums/showthread.php?p=20230306
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04-17-2011, 08:27 PM	#7
Clap135 Brigadier General 102 Rep 3,460 Posts Drives: 2009 N54 Join Date: Jul 2009 Location: Sticky's Mom House iTrader: (1)	instead of messing with that, just makes sure the black o2 sensors are in the front turbo downpipe and the gray ones are in the rear turbo downpipe
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04-17-2011, 08:47 PM	#8
wren57 Roll Tide 591 Rep 2,345 Posts Drives: 335i Join Date: Jul 2010 Location: St Louis iTrader: (10)	Just checked. Both black wires are on the longer downpipe. Hmm. I wonder what is causing the oscillations. I have no codes (even when stuttering), did the v5 harness upgrade and am running the 3-15 FW/Maps. Should my o2 modifier be set to any specific value or is it irrelevant with canclear on? __________________ Fix your broken/stripped cowl bolts with this elegant brass solution! http://www.e90post.com/forums/showthread.php?p=20230306
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04-17-2011, 10:54 PM	#10
psu139 First Lieutenant 23 Rep 340 Posts Drives: F10 M5 Join Date: Apr 2007 Location: Glenwood, MD iTrader: (1)	I had what sounds to be the same problem a while back. No codes and mostly felt it on cruise control. Turned out to be an injector. Had it replaced and no trouble since.
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04-18-2011, 07:40 AM	#11
Maddawg58 Welcome to the Thunderdome! 13 Rep 141 Posts Drives: E90 335i 6MT Join Date: May 2010 Location: Hawaii iTrader: (0)	I had the same thing, installed the BMS o2 sim, problem solved...smoothed the car right out, plugged it into the v5 harness __________________ 2008 e90 335i, Vishnu V5, DCI, PWM METH, AMS FMIC, AR catless, BMS o2 sim, and HKS exhaust.
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04-18-2011, 07:41 AM	#12
FedeM Made in Italy 31 Rep 287 Posts Drives: Former 135i Join Date: Nov 2010 Location: ZH, Switzerland iTrader: (0) Garage List 2007 BMW 135i [7.40]	FRONT.
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