AEM wideband sensor placement

str8shot · 04-29-2014, 02:03 PM

Anyone know where to put an AEM wideband O2 sensor?

I have a set of BMS downpipes, but I want to have a bung welded on for an A/F gauge before I install them.

As such, there's no current way to look under the car (I'd just be dropping them off) to locate an ideal place to put it.

Could some one post a pic with a picture perhaps marked where to put the O2 bung?

Tiago@VRSF · 04-29-2014, 08:25 PM

These cars have wideband o2's from the factory

Just use your logging device or pickup a P3 in dash guage to display those parameters.

Nugget · 04-29-2014, 08:40 PM

AR design have the option of an extra wideband O2 bung on their downpipes. Maybe see if you can find out exactly where they put it. Or even pick up a set of them and sell you surrent pipes.

e36addict · 04-30-2014, 07:34 AM

Quote:

Originally Posted by Tiago@VRSF

These cars have wideband o2's from the factory

Just use your logging device or pickup a P3 in dash guage to display those parameters.

This. And if you install in one downpipe, you're only seeing 3 cylinders worth of AFR... seems a bit pointless.

str8shot · 04-30-2014, 09:11 AM

Quote:

Originally Posted by e36addict

This. And if you install in one downpipe, you're only seeing 3 cylinders worth of AFR... seems a bit pointless.

I don't want to plug in my AP every time I get in my car.

Also, I'm going to install JB4 and use my AP for the backend flash, so I'll lose can-bus monitoring.

And if your HPFP takes a dive on e85, half a bank is good enough tell.

Freon · 04-30-2014, 09:19 AM

Should not be too close to the turbos or it will overheat. I'd say at least 18 inches away. Should be before any catalytic converters.

It needs to be mounted so gravity will not drain condensation into the sensor as this will ruin it quickly.

You can buy a stainless bung and have it welded in by an exhaust shop.

You can mount it farther back in the midpipe, but the signal will be delayed at low loads. At high loads, the delay isn't that much as velocity is high. For simple troubleshooting and spotting problems this isn't a big deal, but for precise tuning and log analysis you want it as close as you can without burning the sensor out.

Tiago@VRSF · 04-30-2014, 09:22 AM

Easier said than done with a 3" DP to be honest. There's very little room for the OEM sensors let alone an additional sensor. Your best bet will probably be the bank 1 turbo right before the factory rear o2.

edisapimp · 04-30-2014, 09:28 AM

Can you discuss why you would like an A/F versus an EGT?

135iam · 04-30-2014, 09:33 AM

To the OP, I have a set of AR Downpipes on the shelf at home, I can send you a pic of the bung locations if that helps. Honestly I havent looked at them yet

str8shot · 04-30-2014, 10:07 AM

Quote:

Originally Posted by 135iam

To the OP, I have a set of AR Downpipes on the shelf at home, I can send you a pic of the bung locations if that helps. Honestly I havent looked at them yet

That would be awesome. Thanks!

Tiago@VRSF · 04-30-2014, 10:16 AM

The AR has different bung locations than the BMS, you may want to keep that in consideration.

135iam · 04-30-2014, 09:36 PM

My AR downpipes only have O2 bungs, no additional for a wideband. I checked A'S website after looking at mine and they are $20 ea additional bung.

04-29-2014, 02:03 PM	#1
str8shot Lieutenant 107 Rep 471 Posts Drives: N54 Montego Blue 135i Join Date: Mar 2012 Location: Wisco iTrader: (1)	AEM wideband sensor placement Anyone know where to put an AEM wideband O2 sensor? I have a set of BMS downpipes, but I want to have a bung welded on for an A/F gauge before I install them. As such, there's no current way to look under the car (I'd just be dropping them off) to locate an ideal place to put it. Could some one post a pic with a picture perhaps marked where to put the O2 bung? __________________ 08 Montego Blue 135i Coupe // Sport Package // Custom E30 tune // str8shot bluetooth enabled ECA // Walboro 255 inline pump // BMS downpipes // VRSF 7" FMIC // Injen intake // Berk ceramic exhaust // OEM 550i clutch // MFactory single mass flywheel // Vorshlag camber plates // Hotchkis FSB // Turner adjustable drop links // AST 5100 coilovers // Hawk HPS pads // Ti backing plates // Stoptech stainless brake lines // Turner 15mm spacers
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04-29-2014, 08:25 PM	#2
Tiago@VRSF 2095 Rep 43,350 Posts Drives: F90 M5 Join Date: Dec 2007 Location: Doral, FL iTrader: (99) Garage List 2014 F30 328xi [0.00] 2015 F82 BMW M4 [0.00] 2013 Ducati 1199 Pa ... [0.00] 2008 BMW 335i [0.00]	These cars have wideband o2's from the factory Just use your logging device or pickup a P3 in dash guage to display those parameters.
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04-29-2014, 08:40 PM	#3
Nugget Colonel 650 Rep 2,601 Posts Drives: G81 M3 Touring, GR Supra GTS Join Date: Jan 2012 Location: Perth iTrader: (2) Garage List 2011 BMW 135i [10.00]	AR design have the option of an extra wideband O2 bung on their downpipes. Maybe see if you can find out exactly where they put it. Or even pick up a set of them and sell you surrent pipes.
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04-30-2014, 09:19 AM	#6
Freon Major 81 Rep 1,051 Posts Drives: 2009 135i Join Date: Nov 2007 Location: Indianapolis iTrader: (3)	Should not be too close to the turbos or it will overheat. I'd say at least 18 inches away. Should be before any catalytic converters. It needs to be mounted so gravity will not drain condensation into the sensor as this will ruin it quickly. You can buy a stainless bung and have it welded in by an exhaust shop. You can mount it farther back in the midpipe, but the signal will be delayed at low loads. At high loads, the delay isn't that much as velocity is high. For simple troubleshooting and spotting problems this isn't a big deal, but for precise tuning and log analysis you want it as close as you can without burning the sensor out. __________________ 2009 BMW 135i 6MT Sport, AFE intake, Cobb AP, Apex 18x8.5+9.5, 255/275 PSS
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04-30-2014, 09:22 AM	#7
Tiago@VRSF 2095 Rep 43,350 Posts Drives: F90 M5 Join Date: Dec 2007 Location: Doral, FL iTrader: (99) Garage List 2014 F30 328xi [0.00] 2015 F82 BMW M4 [0.00] 2013 Ducati 1199 Pa ... [0.00] 2008 BMW 335i [0.00]	Easier said than done with a 3" DP to be honest. There's very little room for the OEM sensors let alone an additional sensor. Your best bet will probably be the bank 1 turbo right before the factory rear o2.
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04-30-2014, 09:28 AM	#8
edisapimp Civil Rights Activist 115 Rep 949 Posts Drives: E46 Sedan, E88 Vert Join Date: Apr 2013 Location: Long Island iTrader: (0)	Can you discuss why you would like an A/F versus an EGT? __________________ E88 Crimson Red Vert MSport 6MT - Listing your mods in your signature is lame. BMS DCI/MHD E30 Flash!!/AA Sport FMIC/VRSF CP w Tial BOV/VRSF 3" DPs/550i clutch w SPEC SMFW/Apex EC-7s/Whiteline RSFB/E92 M3 FCAs/Bilstein B12 Pro Kit/VRSF inlets
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04-30-2014, 09:33 AM	#9
135iam Second Lieutenant 7 Rep 257 Posts Drives: 2010 135i 6mt Join Date: Jan 2014 Location: IL iTrader: (2)	To the OP, I have a set of AR Downpipes on the shelf at home, I can send you a pic of the bung locations if that helps. Honestly I havent looked at them yet
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04-30-2014, 10:16 AM	#11
Tiago@VRSF 2095 Rep 43,350 Posts Drives: F90 M5 Join Date: Dec 2007 Location: Doral, FL iTrader: (99) Garage List 2014 F30 328xi [0.00] 2015 F82 BMW M4 [0.00] 2013 Ducati 1199 Pa ... [0.00] 2008 BMW 335i [0.00]	The AR has different bung locations than the BMS, you may want to keep that in consideration.
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04-30-2014, 09:36 PM	#12
135iam Second Lieutenant 7 Rep 257 Posts Drives: 2010 135i 6mt Join Date: Jan 2014 Location: IL iTrader: (2)	My AR downpipes only have O2 bungs, no additional for a wideband. I checked A'S website after looking at mine and they are $20 ea additional bung.
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