Ok to remove rear O2? - Miata Turbo Forum - Boost cars, acquire cats.

Welcome to Miataturbo.net   Members
 


MEGAsquirt A place to collectively sort out this megasquirt gizmo

Reply
 
 
 
LinkBack Thread Tools
Old 02-18-2014, 12:03 AM   #1
Junior Member
Thread Starter
 
Join Date: Feb 2012
Location: Atlanta, Ga
Posts: 265
Total Cats: 36
Default Ok to remove rear O2?

Installing new exhaust and O2 was not budging so I cut the wires. I'd like to plug the hole in the new exhaust but will get and install a new sensor if needed.
Do I need to tell the ms3 there is no sensor somewhere?
carnut169 is offline   Reply With Quote
Old 02-18-2014, 12:19 AM   #2
Junior Member
iTrader: (20)
 
Join Date: Apr 2010
Location: Redmond, WA
Posts: 494
Total Cats: 15
Default

just turn off EGO correction under

Fuel Settings -> AFR/EGO Control -> Algorithm (select No Correction)
bmxfuel007 is online now   Reply With Quote
Old 02-18-2014, 08:07 AM   #3
Senior Member
 
Join Date: Apr 2011
Location: Hollywood, FL
Posts: 523
Total Cats: 18
Default

Wait you mean the post cat o2 sensor? This is not your wbo2 right? I don't believe you had that sensor communicating anything to your ms3 and if it did it should not have been using it for any fuel correction. The post cat o2 is there for measuring the cats effectiveness in obd2 emission strategy. Even in factory settings its not used for fuel correction. I would say your job is done.
hector is offline   Reply With Quote
Old 02-18-2014, 08:15 AM   #4
Junior Member
Thread Starter
 
Join Date: Feb 2012
Location: Atlanta, Ga
Posts: 265
Total Cats: 36
Default

Ok, fantastic. So do not change the EGO correction?
carnut169 is offline   Reply With Quote
Old 02-18-2014, 08:35 AM   #5
Supporting Vendor
iTrader: (10)
 
Reverant's Avatar
 
Join Date: Jun 2006
Location: Athens, Greece
Posts: 5,440
Total Cats: 198
Default

The front and rear O2 sensors are not used at all with the Basic MS3.
Reverant is offline   Reply With Quote
Old 02-18-2014, 09:58 PM   #6
Junior Member
iTrader: (20)
 
Join Date: Apr 2010
Location: Redmond, WA
Posts: 494
Total Cats: 15
Default

are you using a wideband? if so, no need to do anything as long as the ms3 is set to look at the wideband. You won't be using the stock o2's, or at least shouldn't be
bmxfuel007 is online now   Reply With Quote
Old 02-18-2014, 11:01 PM   #7
Elite Member
 
DNMakinson's Avatar
 
Join Date: Jan 2013
Location: Seneca, SC
Posts: 2,698
Total Cats: 267
Default

Did you buy that 2.5" exhaust?
DNMakinson is offline   Reply With Quote
Old 02-19-2014, 12:36 AM   #8
Boost Pope
iTrader: (8)
 
Joe Perez's Avatar
 
Join Date: Sep 2005
Location: Chicago (Over two miles from Wrigley Field. Fuck the Cubs. Fuck them in their smarmy goat-hole.)
Posts: 26,317
Total Cats: 1,914
Default

Definitive answer:

The rear O2 sensor is completely irrelevant to any Megasquirt ECU. Its sole function is to validate the performance of the catalytic converter for the purpose of setting a fault code under OBD-II in order to cause you to fail an emissions test.

(This is one of those rare occasions when I'm not exaggerating at all.)



The forward O2 sensor *may be* relevant to a Megasquirt, depending upon how you have everything wired up. Eg: most commonly a third-party wideband sensor is installed in this position, though a stock narrowband sensor *may* be used in some instances.


But, to recap, the rear O2 sensor is *never* relevant in any Megasquirt install.
Joe Perez is offline   Reply With Quote
Old 02-19-2014, 12:52 AM   #9
Elite Member
iTrader: (6)
 
TorqueZombie's Avatar
 
Join Date: May 2011
Location: Lebanon, TN
Posts: 1,668
Total Cats: 63
Default

Well that answers a future question about using the stock narrowband with my MS3
TorqueZombie is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
Raleigh: Fiberglass headlight scope, 1.6L ECU, AFM, Hardtop latches, more bigmackloud Miata parts for sale/trade 13 09-22-2017 01:34 PM
OTS Bilstein to motorsports ASN conversion stoves Suspension, Brakes, Drivetrain 5 04-21-2016 04:00 PM
Back to Stock Part Out!! Turbo Parts, MS2 Enhanced 01-05, Suspension, and MOAR! StratoBlue1109 Miata parts for sale/trade 16 10-02-2015 10:39 AM


Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



All times are GMT -4. The time now is 02:48 AM.