v0lc0m85

i got all my new gauges today, and im trying to hook up the a/f, i tried tapping into both the white and blue wires coming off the o2 sensor from the header, but im not getting any signal. has any one elsed hooked up an a/f to there tc? what way did you do it? it also might be the gauge, i noticed it was opened when i got it, it might have been returned because it didnt work.

thanks

Limey

posting to see if there is an outcome, as i might get some gauges come 06.

edit: dang I went and got one,....

https://www.scionlife.com/forums/vie...251&highlight=

Fushyuguru

I went a put a new bung on the s-pipe, with a bosch wideband o2.

JT_Scion

i was told that standard a/f guages will not get a reading from the type of sensors we have on our car. you will need a wide band. plus its a much better idea to use a wideband.

toyota_scion_tc

factory sensor is a wideband. A aftermarket gauge may not work even if it is a wideband gauge b/c our oem widebands are diffrent then aem wideband and some other types

Limey

Anyone have pictures or a diagram of the wire you should tap to get the o2 readings ?

toyota_scion_tc

What brand and type air/fuel gauge do you have? I don't know any that will work with our header o2 sensor. Its like I said before its a oem wideband not aftermarket wideband.

Limey

https://www.scionlife.com/forums/vie...251&highlight=

It's basically a sensitive LED digital voltmeter, all I need to know is which wire is the O2 wire inside the car.

Fushyuguru

Our OEM sensor is a proprietary wideband, and it wont wire up correctly (like tap'ing the purple wire on most OEM narrowbands). I don't know of anyone who has tap'd into our sensor correctly.

Most, like me, just put our own sensor in.

Limey

So can I confirm it's a 0-5volt version ? Is that 100% accurate - if so I need to change my order pronto before they ship.

Not sure how it couldn't wire up correctly, surely it's just passing a voltage ?

Fushyuguru

Not all sensors have to pass a voltage, it could be an inductance or resistance value across the sensor, which would make alot of sense why people havent been able to tap off the tC sensor like most narrowbands

Limey

So where would the tap go if there was one? Where's the easiest place to test to see what this thing is pumping out, all I need to know is where the wire is and I'll hit it up with a meter.


OK, so how much is a basic wideband sensor, and how easy are they to install?

Limey

What do Dyno's use when they take these measurements?

Fushyuguru

If you were going to try to tap the narrowband sensor (which our car doesnt have) there would be three wires comming from the sensor: two for power (generally red or black and a white) and one for signal (I've seen green and purple). The signal wire is what you would tap off. You can do this either from outside the firewall and route it in the cabin or try and find it on the wiring harness before it hits the ecu. I'm not sure the color of our wires.

However, our wideband O2 doesnt read right when hooked up to a controller, and it's slow response so, worthless for what we want.

So you have two options and both require welding a bung on your s-pipe to mount a new sensor. You can buy a new narrowband sensor (try the autometer part #2244, ~$100) and run a narrowband gauge which pretty much is only worth a light's show as it says your running stoich, or not.

Or you can get a wideband O2 sensor which requires a controller, a good package is the LC-1 from innovative ($200 + Gauge) which is reprogramable to work with narrowband gauges like the autometer's, and comes with a Bosch heated oxygen wideband sensor. You can also use one of the two analog outputs to log A/F in their free software so you can tweak on the street. Widebands tell the exact ratio in a voltage between 0-5V generally. The voltage matches up to a conversion table and you get your true A/F Lambda value.

Dyno's use wideband controllers and wideband sensors. If you already have one installed, theyll use it, otherwise they have a couple methods depending on how your car is set up to get a probe in there, like if you hfave no cat's installed they can use a tailpipe sensor probe.

Limey

OK,. So if I picked up a Bosche Wideband O2 sensor off ebay for $70-80 and had that installed that would be the best route.

What does having a bung welded on usually cost?

Limey

Does anyone know the part number of the O2 sensor?

Does it appear in this list: http://www.discountconverter.com/O2Sensors/

StatuSCheckA

iTrader: (1)

wow, has anybody hooked up a AF gauge to a TC successfully? I want to get one soon,

WeDriveScions

In order to do it, you need a wideband O2 setup... with a separate sensor bung welded into the SPipe...

I'm going with either innovate or PLX... They will be your best best to accomplish what you need...

Do not look at narrowband or try to tap into the stock sensor... no one's been able to do it.

Count on about 350 for a good Wideband setup.

zer0

WeDriveScions, Ill sell you my Brand New PLX M300 for $300 shipped?

WeDriveScions

I'm leaning toward the 250 with the guage.... I can put it with my nitrous pressure and fuel pressure...

I also can get the M300 new locally for $300 as well... Sorry.