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08-19-2011, 05:02 PM | #1 |
The stock o2 sensor is a wideband
I figure this is the best place to put this info. I won an aftermarket wideband in a contest and said screw it and installed it on the Yaris for s & g's. Few observations of note:
- 14.5-14.7 AFR is the cruising and idle target - The o2 readings DO NOT oscillate during cruise. They reach the target and move .1-.2 points one way or the other to maintain the target. Narrowband sensors do not do this - From what I can tell, the computer adjusts very fast and very accurately. Was very surprised to see this behavior - Open loop WOT with the stock intake drops the AFR to 12.5 (rich). After installing my Injen CAI, the target raised to 13.1. Stock airbox is a major restriction on this car. Very noticeable difference between the two - AFR richens up to a mind boggling 10.9 with the stock airbox right before and up to redline. With the intake its like 11.3 or so (I can't exactly remember, only did it once or twice) From what I can tell, with just a proper standalone/piggyback computer this motor could easily pull 115-120whp with tuning and regular I/H/E upgrades.
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08-19-2011, 09:16 PM | #2 |
Drives: 2008 HB, A/T, Power W/L/M Join Date: Oct 2008
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Did you use Scangage II?
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08-19-2011, 09:45 PM | #3 |
Drives: 08 Yaris Sedan Join Date: Oct 2008
Location: California - Bay Area
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That could be because the yaris utilizes air fuel ratio sensors which is wide range. More expensive and more acurate. Where as oxygen sensor is more narrow range. The one after the cat is probally regular o2 sensor.
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08-19-2011, 10:55 PM | #4 |
Mr. 155 and climbing
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We noticed this when I was attempting my first few tries at calibrating my FIC
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08-19-2011, 11:11 PM | #5 |
For monitoring all the stock sensors and gas mileage, yes. To monitor the wideband, I have a gauge
Agreed. Primary o2 is wideband, secondary is narrow
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08-19-2011, 11:45 PM | #6 |
1NZ-6spd
Drives: '05 6-Spd Vitz RS Join Date: Oct 2008
Location: Oshawa, Ontario, Canada
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Primary is not an O2 sensor, it's a A/F ratio sensor. But the secondary is an O2.
Last edited by Bluevitz-rs; 08-20-2011 at 10:01 AM. |
08-20-2011, 07:08 AM | #7 |
What are you talking about? That makes absolutely no sense whatsoever.
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08-20-2011, 10:01 AM | #8 |
Drives: '08 LB, '07 WRX Join Date: Jan 2009
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almost all newer toyota's use A/F sensors in the front position(2) and O2 after cat. The A/F's aren't exactly cheap, but they have their benefits.
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08-20-2011, 10:02 AM | #9 |
1NZ-6spd
Drives: '05 6-Spd Vitz RS Join Date: Oct 2008
Location: Oshawa, Ontario, Canada
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I re-edited my post to be less confusing for you.
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08-20-2011, 10:16 AM | #10 |
advocatus diaboli
Drives: 07 Yaris hatch Join Date: Mar 2011
Location: San Jacinto California
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Just to clear something up for myself...if the primary is A/F, why am I looking for a gauge with it's own sensor? Can I just run a gauge only and be done with that?
This is in regards to my turbo install coming up, gauges are all I need at this point.
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08-20-2011, 11:07 AM | #11 |
1NZ-6spd
Drives: '05 6-Spd Vitz RS Join Date: Oct 2008
Location: Oshawa, Ontario, Canada
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from the original post that looks to be all that's needed.
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08-20-2011, 12:04 PM | #12 | |
Still confusing as all hell but I think I understand what you're trying to say. Both sensors are o2 sensors but only one has a range wide enough to read A/F, while the other can only read rich or lean. Most aftermarket wideband o2's are 0-5 volts and stock narrowbands 02's are 0-1 volts.
Quote:
I got my gauge from Prosport http://prosportgauges.com/
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08-20-2011, 12:05 PM | #13 |
To be 100% clear...I am not pulling my readings from the stock o2 sensor itself. My gauge is reading from an independent sensor that's installed near the stock o2 port on the header.
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08-20-2011, 12:56 PM | #14 |
1NZ-6spd
Drives: '05 6-Spd Vitz RS Join Date: Oct 2008
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ok, I'll dumb it down as much as I can.
The first sensor in the exhaust located in the manifold is called an AIR/FUEL RATIO SENSOR. NOT AND OXYGEN SENSOR. The second sensor in the exhaust located after the catalytic converter IS call an Oxygen Sensor. The job of the A/F Ratio Sensor is to adjust fuel delivery to maintain set parameters from the ECU. This a very fast and sensitive sensor. The job of the Oxygen Sensor is to make sure the Catalytic Converter is doing it's job. This is a slow acting narrow range sensor. The Yaris has a more sophisticated ECU compared to the Echo and can more accurately control fuel delivery based on more accurate readings from the AFR sensor. |
08-20-2011, 05:02 PM | #15 |
Drives: 2010 black yaris Join Date: Oct 2010
Location: savannah, ga
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Bluevitz is absolutely correct.
pre-cat is an Air/Fuel sensor. post-cat is the Oxygen sensor. |
08-20-2011, 06:27 PM | #16 |
ULTIMATE
Drives: 07 Yaris Turbo Join Date: May 2007
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^ The first one is actually a hybrid design, but that's getting pretty nitpicky.
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08-20-2011, 06:28 PM | #17 |
No he's not. A/F sensors ARE o2 sensors! What the hell do you think the sensor is reading? Magic fairy dust?
You're arguing semantics with me and its making my head hurt.
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08-20-2011, 07:05 PM | #18 |
Drives: 2010 black yaris Join Date: Oct 2010
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Ok, I will agree there. Most people do refer to those sensors as O2. I was trained by toyota that they are a/f sensors. Which you are correct, is just a wideband O2 sensor.
So to get this thread back on topic. YES, toyota has been using a wideband O2 sensor for the past 15 years. |
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