school me on 02 sensors.....

[DOOK]

so the 02 sensor that goes into the turbo outlet pipe, do you need it? somewhere during the build I think the 02 sensor wire got snipped. Obviously running a wideband it would be needed, but I'm not. Am I gonna have to give myself a headache and rerun the wire and run an 02 or can I just put a bolt in the sensor bung to block it off and roll without it :D. Yeah, I kinda know what 02 sensors hypothetically do, i just don't know how it would affect the SR:bite:

[DOOK]

tech gurus unite

[projectRDM]

The O2 sensor is required for any type of OE engine management. Reinstall it if you're not using a standalone.

[DOOK]

damn it I was waiting for you and I KNEW you were going to say that

[MELLO*SOS]

Well u already got your answer.. But so you know what it does and why you should use it... The o2 sensor is used during closed loop, which is anytime the engine is idling or under part-throttle cruise. It provides feedback to the ecu regarding oxygen levels in the exhaust, so the ECU can constantly fine tune fuel delivery to maximize fuel economy and emissions... So if you run the engine without it, the ecu will have a hard time adjusting the short and long term fuel trim, which will probably result in a shitty idle, some popping/backfire during normal driving and lowered fuel economy. I would suggest picking up a nice wideband sensor and control box that features a narrowband output. This way you get the best of both worlds (stock ecu is happy it has narrowband, and you/your tuner is happy u have wideband) and only have to do the work once. Or if you're hurting for money right now just run new wires from the o2 back to the ecu harness. GL

[DOOK]

Well u already got your answer.. But so you know what it does and why you should use it... The o2 sensor is used during closed loop, which is anytime the engine is idling or under part-throttle cruise. It provides feedback to the ecu regarding oxygen levels in the exhaust, so the ECU can constantly fine tune fuel delivery to maximize fuel economy and emissions... So if you run the engine without it, the ecu will have a hard time adjusting the short and long term fuel trim, which will probably result in a shitty idle, some popping/backfire during normal driving and lowered fuel economy. I would suggest picking up a nice wideband sensor and control box that features a narrowband output. This way you get the best of both worlds (stock ecu is happy it has narrowband, and you/your tuner is happy u have wideband) and only have to do the work once. Or if you're hurting for money right now just run new wires from the o2 back to the ecu harness. GL

thanks dude, yeah right now I'm returning to a more stock setup where I'm actually going to have to use one sooooo looks like I'll be running new wires.

[jaboyak]

The motor will go into Limp Mode. It's going to run pig rich until you get one.

Did you cut the wires BEFORE the connector or between the connector and the sensor?

[steve shadows]

The motor will go into Limp Mode. It's going to run pig rich until you get one.




"and the skys will fall from the heavens"

I drove like that for a whole year, no 02, stock edu. Got about the same gas milage as my current KA dd. Wasnt that bad.

Just replace it or better yet pick up any tuned rom off ebay.

[jaboyak]

Just replace the O2 sensor, on second thought, unless you're going to get some sort of aftermarket EMS.

Getting a tuned ROM would do him more harm than good, unless he had the same mods as the ROM was tuned for ESPECIALLY if the ROM was tuned for a different MAF...

[johngriff]

I would say 80% of the 02 sensors in clip motors are shot anyways, and sending incorrect signals.

Most shops dont wire the check engine light.

Probably the majority SR'd cars on here are probably running bad o2 sensors and might as well have none at all.

You will get bitchen mileage with 91+ and a New o2 Sensor. Will you pay $90 for a new one?

Tuned roms are tuned for outrageous amounts of timing. They are a party.

[DOOK]

I have the connector, I found it, I had it ziptied under the harness on the side. Anyways, I now just need to wait on my outlet to get here and find out which style sensor it is, fat or skinny.

[GSXRJJordan]

All the outlets I've seen have fat style holes, and plugs which you can tap for a skinny o2 sensor. I run a fat sensor off my redtop ecu, runs fine... but I always have a little ache in the back of my head that I could get better mileage switching to a skinny sensor... anyone have quantifiable info that the sensors sent the same/different signals?

[DOOK]

as far as I know they are the same when it comes to that aspect.

[johngriff]

Same signal. The fat sensor is better because it is more resilient to heat being so close to the outlet of the turbo.

I've datalogged the fat and the narrow, they both overheat and crap out, but the fat takes longer to overheat, and will come back on much quicker once the exhaust stream gets moving by it (jumping on the throttle).

[Wei240]

man, after reading this thread... i need to wire up my wideband....

my o2 sensor does not get any signal at all, i don't know much about this open/close loop system either, but i have a tuned pfc and still get mediocre gas mileage, 26mpg highway, and 18ish street (pfc has o2 powered on, but getting no power on the harness side of the o2 connector...)

i'm pretty sure my lc-1 has an output to feed the ecu so maybe it'll run better during idle/mid throttle...

sorry for the threadjack, haha

[johngriff]

just make sure you use the 0-1v not the 0-5 for the pfc