removing o2 sensors...
removing o2 sensors... boy oh boy i never thought id see the day where id be wiring a whole car
anyway good thing there are tons of help out there but im having trouble deciding whether or not to keep front o2 sensors
its going to be a track car
i will be running wideband
are they only to do with fueling?
pros cons of keeping them
anyway good thing there are tons of help out there but im having trouble deciding whether or not to keep front o2 sensors
its going to be a track car
i will be running wideband
are they only to do with fueling?
pros cons of keeping them
The car will run without O2 sensors. You will just have to run and tune it in open loop. O2s are just used for idle and part throttle closed loop fuel trimming. Even for a street car while having O2s will be easier to tune you can, and many do run open loop with out them. And for a track car, even if you had them they are not used for WOT fueling at all. 
TECH Senior Member
Joined: Jun 2016
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From: Central Cal.
Idle and part throttle are 90% of street driving. You COULD run open loop, but what's the point? Might as well run a carburetor.
Flat out racing? Sure, then you don't need O2 sensors. AND I noticed the OP IS running it at the track, so my bad there. It was early in the AM.... lol
I go there again because I'm right. The car WILL run without O2 sensors, but not nearly as well as with. They're there for a reason.
Flat out racing? Sure, then you don't need O2 sensors. AND I noticed the OP IS running it at the track, so my bad there. It was early in the AM.... lol
I go there again because I'm right. The car WILL run without O2 sensors, but not nearly as well as with. They're there for a reason.
Joined: Aug 2007
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From: Turnin' Wrenches Infractions: 005
I just did an open loop tune for somebody having 02 issues until he replaced them. He didn't complain about the way the truck drove. That being said they will help compensate for weather changes and stuff like that. If your VE is on point your afr is going to be right, under the same circumstances, and I'm assuming you are running no maf either, so any weather variation from the day you tuned will effect afrs. That being said if there isn't a solid reason to delete them I wouldnt. Basically because I want the trims to be functioning.
Last edited by 01ssreda4; Aug 29, 2017 at 12:00 PM.
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TECH Senior Member
Joined: Jun 2016
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From: Central Cal.
True, it's the VE table keeps things on track, and tuning is done in open loop to keep any "self-correction" at bay. But even Speed Density systems use O2 sensors to keep the AFR straight. The VE table can't do it right on its own.
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Verdad Gallardo TECH Senior Member
Joined: Jun 2016
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From: Central Cal.
I did say it was early in the AM. Is your main function to pick my posts apart? You don't do anything else worthwhile, so, YEAH. Do I care? NO. You can blow it out your ***.
I SHOULD have said, "the front O2 sensors are needed to fully define the A/F ratio." So there.
I SHOULD have said, "the front O2 sensors are needed to fully define the A/F ratio." So there.
I need Open loop SD and MAF all the time... use my Wideband and dial in fuel
I just did an open loop tune for somebody having 02 issues until he replaced them. He didn't complain about the way the truck drove. That being said they will help compensate for weather changes and stuff like that. If your VE is on point your afr is going to be right, under the same circumstances, and I'm assuming you are running no maf either, so any weather variation from the day you tuned will effect afrs. That being said if there isn't a solid reason to delete them I wouldnt. Basically because I don't want the trims to be functioning.
Joined: Aug 2007
Posts: 24,241
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From: Turnin' Wrenches Infractions: 005
And i edited it, I meant at the bottom I WANT the trims working. From my limited experience a solid tune (VE and or maf dialed in) will probably only see 5 percent trims due to weather. I could see how there is an argument for that not being enough to worry about. However, if it's available, why not use it? I did later on start running a wideband, not so much to see if my tune was right, I was confident it was, but more so just as a failsafe, so that I could see in real time what the car was doing (think fuel pump going out or something) and notice any abrupt changes that might occur. I also did it bc I wanted to data log and tune at the track, and wanted something hard mounted I could plug right into at any given time. Now that I'm going boosted I'm glad I have it, but will absolutely still keep the narrow bands functioning.