Wideband with stock ECU

WankelsRevenge · 02-01-2014, 01:12 PM

Im currently looking at getting/installing one of AEMs wideband gauges. What Im unsure of is will it cause any issue with my stock ECU if I remove the OEM narrowband O2 sensor and replace it with the AEM wideband one? I also plan on switching to a Megasquirt system within the next 6 months or so and allready know it will be compatable with that, but will it run the stock ECU in the meantime?

Dannobre · 02-01-2014, 01:39 PM

Check to see if the AEM has a narrowband 0-1V output mode...if it does you can likely set up the wideband sensor so the ECU sees what it needs

85rx-7gsl-se · 02-01-2014, 03:11 PM

I doubt you want to put your wideband sensor in the stock location unless you want it to burn out very quickly. It is advised to place the sensor further downstream to increase sensor lifespan.

C. Ludwig · 02-01-2014, 04:40 PM

In theory, the stock narrowband is there to provide feedback for closed loop operation at partial loads for improved efficiency. In reality, your sensor has probably never been replaced and probably stopped working correctly sometime during the Bush 1 administration. Removing it all together will probably not effect anything.

All that said, the proper way to do this is to have a good working narrowband sensor and then add a 2nd O2 bung and put the wideband in there. It's really not too expensive to have an exhaust shop weld another bung in there.

***TitaniumTT*** · 02-02-2014, 10:55 AM

What Chris said is absolutely right. The feedback portion of it makes very VERY little changes.

If you do have a bung welded in, use an old sensor for a plug. I've never had any luck with the plugs where the sensors themselves rarely get gauled and seized in there.

WankelsRevenge · 02-02-2014, 01:12 PM

Ill keep all this in mind. Since Id be relocaing the wideband sensor a bit further downstream, would it be possible to use the stock location for a EGT probe?

Fendamonky · 02-02-2014, 10:59 PM

If you're going to put in EGT's you might as well do it right and measure each rotor independently, before the turbo. I don't consider myself and expert by any means, but from what I've seen there is also a dramatic difference in the physical size of EGT sensor/bungs and your AFR sensor/bungs.

WankelsRevenge · 02-03-2014, 01:21 PM

I only have a NA motor so no before turbo for me. I'll probably just put in a stick o2 in the factory location. I just plan on putting in a full Racing Beat exhaust and header, and then install a megasquirt so Im trying to plan out as much stuff in advance as I can.

C. Ludwig · 02-03-2014, 03:34 PM

Like Fenda said, do a dual channel EGT. One in each primary.

02-01-2014, 04:40 PM	#4
C. Ludwig Rotary Masochist Join Date: May 2008 Location: Floyds Knobs, IN iTrader: (5) Posts: 494 Rep Power: 17	In theory, the stock narrowband is there to provide feedback for closed loop operation at partial loads for improved efficiency. In reality, your sensor has probably never been replaced and probably stopped working correctly sometime during the Bush 1 administration. Removing it all together will probably not effect anything. All that said, the proper way to do this is to have a good working narrowband sensor and then add a 2nd O2 bung and put the wideband in there. It's really not too expensive to have an exhaust shop weld another bung in there. __________________ _______________________________________________ *One stop Haltech, AEM, Syvecs shopping. Installation and tuning.* http://www.lms-efi.com *Free support. Drop us an email.* chris@lms-efi.com 502-515-7482 Facebook @LMS-EFI

02-02-2014, 10:55 AM	#5
*TitaniumTT* Test Whore - Admin Join Date: Mar 2008 Location: Right Behind you son iTrader: (4) Posts: 4,581 Rep Power: 10	What Chris said is absolutely right. The feedback portion of it makes very VERY little changes. If you do have a bung welded in, use an old sensor for a plug. I've never had any luck with the plugs where the sensors themselves rarely get gauled and seized in there. __________________ -The Angry Stig- DGRR 2009, 2011, 2012 & 2013 - Best FC DEALS GAP!! WOOHOOOO!!!!! 2015 Audi S4 - Samantha - Zero Brap S4 2004 RX8 - Jocelyn - 196rwhp, 19mpg fuel to noise converter 2000 Jeep Cherokee Sport - Wifey mobile - Now with 2.5" OME lift and 30" BFG AT KO's! So it begins 1998 Jeep Cherokee - 5 spd, 4" lift, 33" BFG's - Rotary Tow Vehicle 1988 'Vert - In progress 1988 FC Coupe - Gretchen -The attention whore BEAST! I'm a sick individual, what's wrong with you? I'm pure Evil I'm still insane, in the best possible way. I think Brian's idea of romance is using lube. Your rage caused the meteor strike in Russia. The Antichrist would be proud of his minion. You win with your thread. Most everything It's a truck with a steel gate on the back. Just a statement of fact Motec M820, AIM dash, ported 13B-RE Cosmo, 6-spd trans, 4.3 Torsen, custom twin wg fully divided mani, Custom 4" split into 2x 3" exhaust, Custom HMIC, Custom custom custom custom I like to welder stuff.... No Bolt-ons allowed. Dyno'ed @ Speed1 Tuned by me - 405rwhp on WG.... WM50 cuming soon. *-Angry Motherfcker Mode ENGAGED-**

02-03-2014, 03:34 PM	#9
C. Ludwig Rotary Masochist Join Date: May 2008 Location: Floyds Knobs, IN iTrader: (5) Posts: 494 Rep Power: 17	Like Fenda said, do a dual channel EGT. One in each primary. __________________ _______________________________________________ *One stop Haltech, AEM, Syvecs shopping. Installation and tuning.* http://www.lms-efi.com *Free support. Drop us an email.* chris@lms-efi.com 502-515-7482 Facebook @LMS-EFI

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02-01-2014, 01:39 PM	#2
Dannobre Rotary Fan in Training Join Date: Oct 2008 iTrader: (0) Posts: 87 Rep Power: 17	Check to see if the AEM has a narrowband 0-1V output mode...if it does you can likely set up the wideband sensor so the ECU sees what it needs