What voltages does a wideband O2 sensor read? I know a standard 02 sensor reads between 0 and 1v. Also: Is it necessary for it to be heated?
I don't have a manual. I'm wondering if I can source a sensor from somewhere else, and my work has restricted internets. Trying to piece together some stuff for cheap.
There's some info on it here (random thread I saw recently on WBO2): http://www.rs25.com/forums/showthread.php?t=102928&highlight=wideband Towards the bottom there's a link to a whitepaper by Innovate (http://www.innovatemotorsports.com/resources/news3.php) or something. Probably lots of good info in it.
Wideband O2 sensors are 0-5v signal, NBO2 sensors are 0-1v. If you want to output an Innovate to a wideband gauge of somesort, you'll need a gauge that reads the 0-5v signal range. You will still need the Innovate controller to handle the heating element for hte Bosch WB sensor. But the Innovate should have a 0-5v output signal to be used for a gauge or whatever you have that will read a 0-5v wideband signal.
Probably 2 to run the heating element, 2 for 5v logic to the sensor, and 2 for the sensor that tells the temperature of the O2 sensor. Don't quote me on that, but I would assume that is what those do.
One of my techs here said something about an Ion something or other. :laugh: Ion Pump? I said that sounded like a crock o' BS, but.... I guess this is new territory for me.
As long as it tells me that 3.3v = stoich of 14.7:1, low 02 levels = lower voltage, I'm happy. :biggrin:
Well most modern cars (read obd2) all have a 0-5v o2 sensor, it is more a matter of what you are going to do with the info the sensor gives you. Also, not all wb02 sensors are the same. Like all the innovate controllers basically use a VW sensor. So you can go to a VW dealership and pick up a spare o2 sensor that will work in all the lm-1/lc-1/lm-2 controllers. The older wbo2 sensors were the old style honda lean burn sensors. Problem with those is that they were $300 for just the sensor. Now with the newer tech, you can get the vw sensors for under $40. The big issue is getting something to control the sensor and spit out useable data from the sensor. Russ
So a 0-5v sensor doesn't mean its wideband. Excellent. This is exactly what I was looking for. Thank you.
No, then 0-5v means it is a wide band. It is up the the ecu/controller to determine what it wants to do with the information. 0-5v is more resolution than the 0-1v narrowband sensor. Like your wrx has a wbo2 in the front. There is 2 things going on with that sensor that will work for you and against you. For light load, tip in, spool time, stuff like that, the front 02 sensor will work for tuning. The problem with a wb02 sensor( or any sensor o2 sensor for that matter), is that the more pressure is see's, the more the results will be skewed. Meaning, that most IHI turbos with have a PR over 2:1. So for every PSI of boost, you have 2 psi of pressure in the exhaust system between the exhaust valve and the turbine. So as boost increases, the pressure in the exhaust also increases. So what subaru does, is once the ecu see's a certain load, it will switch over to open loop and run on the ecu map. So if you are running 20psi of boost, you will have 40+ psi of pressure in the exhaust and your o2 sensor readings will be worthless. The reason that subaru puts the sensor before the turbo is to get a fast and more acurate o2 reading while at light load (cruising). The sensor will get the readings coming out of the head quicker and make adjustments to the fuel to keep you afr as close to 14.7 (if that is what the map is calling for) as it can. So that will help you get your best fuel mileage while cruising down the road. Russ
So then I can use a 4-wire (Toyota P# 89467-48011) as a wideband sensor? Output is a 0-5v with 3.3v being stoich.
Sure, if you can create some kinda of controller to regulate the heater and decipher what the voltage is for a certain AFR at a given temp. Russ
Just found out the Lexus A/F sensors are NOT going to work well. They're programmed at 14.7:1. They're more of a switch. There are 3 outputs: 0v, 3.3v , and 5v. 5v if its too lean, 3.3 if its running stoich, and 0v if its rich.
