Wide Band O2 Installation Questions

triksterut · 11-10-2012, 06:06 PM

Hey all,

I've got the new PLX rear view mirror all wired in for a boost gauge and the OBD2 interface - I was going to hook up the wide band today and realized it wasn't as easy as I was thinking.

I'm running AP headers with pre and post-cat bungs. The post-cat bungs have spacers/deflectors of some sort. I assume this is for cars that care about post O2's. I also assume this will mess up my wide band reading. I put my stock post O2's back in there just so I wouldn't have to zip tie them somewhere.

So - two things. First, I was thinking that I really need a wide band for each header/bank? Do people normally run these into a collector or call the data off one bank good enough? Secondly, can I just buy another wide band sensor and replace both of my pre-cat O2's with the wideband's? Then route the signal to the ECU and my gauge via a splitter of some kind?

How have you guys got these things wired in?

triksterut · 11-11-2012, 11:05 AM

So the more I read about this the more I think I'm just going to replace one of my pre-cat O2's with the PLX wideband (PLX SM-AFR which uses a really standard Bosch LSU 4.2 sensor). This means I've got to run the 0-1V output from the control box to the input of the old O2 sensor - no big deal. The part that doesn't really appeal to me is the heat generated by using a 20Ohm 10W resistor on the O2 heater circuit - so you don't pull a CEL. Well, since my car has an Active kit and tune on it - I don't think it cares about this anymore

Has anyone tried just not hooking the heater circuit back up?

drumbum624 · 11-27-2012, 04:31 PM

bump for I have similar questions

triksterut · 12-04-2012, 11:03 PM

Well - after more research I kind of answered my question. You really just need to stick the sensor on the collector or as close to Cyl 6 as you can - as that is the cyl that tends to run the most lean. Seems to be what most people do.

m3yal8r · 12-05-2012, 08:16 PM

Please share your final install as I have had the PLX mirror installed for months and have been lazy/remiss in finishing install of boost and a/f.

11-10-2012, 06:06 PM	#1
triksterut Registered User Join Date: May 2009 Location: Utah Posts: 61 My Ride: 05 M3 Vert View My Garage	Wide Band O2 Installation Questions Hey all, I've got the new PLX rear view mirror all wired in for a boost gauge and the OBD2 interface - I was going to hook up the wide band today and realized it wasn't as easy as I was thinking. I'm running AP headers with pre and post-cat bungs. The post-cat bungs have spacers/deflectors of some sort. I assume this is for cars that care about post O2's. I also assume this will mess up my wide band reading. I put my stock post O2's back in there just so I wouldn't have to zip tie them somewhere. So - two things. First, I was thinking that I really need a wide band for each header/bank? Do people normally run these into a collector or call the data off one bank good enough? Secondly, can I just buy another wide band sensor and replace both of my pre-cat O2's with the wideband's? Then route the signal to the ECU and my gauge via a splitter of some kind? How have you guys got these things wired in?

11-27-2012, 04:31 PM	#3
drumbum624 Registered User Join Date: Dec 2010 Location: Baltimore, MD/DC Posts: 629 My Ride: is finally boosted View My Garage	bump for I have similar questions __________________ Uploaded with ImageShack.us

12-05-2012, 08:16 PM	#5
m3yal8r Registered User Join Date: Nov 2006 Location: Grasonville, MD Posts: 101 My Ride: 2002 e46 M3 View My Garage	Please share your final install as I have had the PLX mirror installed for months and have been lazy/remiss in finishing install of boost and a/f. __________________ 2002 BMW M3 [/B]Titanium Silver Metallic / Black / 6 Speed Mods: Performance: ESS VT1 455 Supercharger, Stepped Headers / Borla Header Back / Walbro 255 Suspension: Ground Control Street / School Coil-over 440/545 / AKG Motorsport Bushings all around Wheels: ZCP Comps 18X9.5 18X8.5 Magic Powers: Radar-Mirror PLX Gauge set-up/ V1 radar detector / Laser Interceptor

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11-11-2012, 11:05 AM	#2
triksterut Registered User Join Date: May 2009 Location: Utah Posts: 61 My Ride: 05 M3 Vert View My Garage	So the more I read about this the more I think I'm just going to replace one of my pre-cat O2's with the PLX wideband (PLX SM-AFR which uses a really standard Bosch LSU 4.2 sensor). This means I've got to run the 0-1V output from the control box to the input of the old O2 sensor - no big deal. The part that doesn't really appeal to me is the heat generated by using a 20Ohm 10W resistor on the O2 heater circuit - so you don't pull a CEL. Well, since my car has an Active kit and tune on it - I don't think it cares about this anymore Has anyone tried just not hooking the heater circuit back up?

12-04-2012, 11:03 PM	#4
triksterut Registered User Join Date: May 2009 Location: Utah Posts: 61 My Ride: 05 M3 Vert View My Garage	Well - after more research I kind of answered my question. You really just need to stick the sensor on the collector or as close to Cyl 6 as you can - as that is the cyl that tends to run the most lean. Seems to be what most people do.