I have the idea in my head that I need a new O2 sensor. I have space for a gauge, and I want to get a wideband. I have upped the boost a little in my kei-car, and i am using water, with a little meth, to keep things cool. I would like to see how the water/meth affects the afr, so I see the need, and money for a wideband. Since there is only one bung, I will need something that can also work as a substitute for the 1 wire sensor I have on it now. What brands can output a narrowband signal, and are any of them tuneable, like an EIFE or similar?
uh if the engine computer calls for a narrow band, you've got to stick with that unless you modify the computer. Narrow band O2 sensors don't really output much data because they're not intended for that sort of operation so getting something that can read that data wouldn't be too useful. Anyhow, even if you did know your A/F ratio, you still can't do a thing about it unless you modify the computer.
The wideband output signal is generally linear, which is a different shape than a narrow band.
If you could modify the circuits to feed the wideband signal into the computer (which is expecting an narrow band), it will cross 0.45Vdc at 14.7:1, however behavior on either side of 14.7:1 will not be what the computer is expecting and probably mess up the cross counts and throw a code.
you do not need a second O2 sensor. most wideband setups (sensor, gauge, computer (usually in the cable) will have an option for a separate output for the cars ECM. they know that a lot of people will substitute it for the original O2 sensor and don't want to pay for a second sensor and whatnot. Just check the product description before buying.
the only thing you'll have to figure out is how to fool the heater circuit if there is one, so you don't get a code for a failed/open O2heater.
1991 Toyota Pickup 22R-E 2.4 I4/5 speed
1990 Toyota Cressida 7M-GE 3.0 I6/5-speed manual
mechanic, carpenter, stagehand, rigger, and know-it-all smartass
"You don't get to judge me for how I fix what you break"