O2 sensor

[The Dan]

Ok well if you need anything else, just let me know and I'll do all the running around for you.

[Cubes]

Nisasn want $280 for an R32 GTST O2 sensor. That sucks.

I'm hoping the R33 S1 O2 sensor is the same.

Graham West Dyno down in Adelaide apparently knows what aftermarket o2 sensor to use with the rb20det's. He quoted $130.

Edited December 15, 2005 by Cubes

[Col-GTSX]

So i just read the whole thread....

So coinfusing... People saying different things...

I currentlly have bosch 3 wire white/black/white

and i have bought an aca rox207

which has black/black/blue...

Im gonna hook up like this;

Nissan Ford

white------black

black------blue

white------black

Is this right???

[benl1981]

So your telling me after 21 pages you guys haven't figured out what is a cheap alternative to the stock sensor ...

I thought you would be able to get any sensor suitable for a turbo with same thread pattern..all 02 sensors read 0-1v and have a simlar "narrow" band of operation

Thats rough

Edited December 15, 2005 by benl1981

[Col-GTSX]

i got the part but they talk about replacing the original o2 sensor not an aftermarket bosch sensor

[benl1981]

Hey Col GTSX - wasnt directing it at you...Just seems like they havent come to a conclusion on what is a good sensor to use. Just stirring I guess but would like to know in case I need one

[Col-GTSX]

Ok i conected as i stated and it works fine...

SO ill report on any improvement...

I have the stock ecu back in atm due to a pfc stuff up...

[Col-GTSX]

Ok.... instantlly heaps punchier....

After the engine warmed up it got really tweaky....

No excesive fuel out the back when i boot it....

Seem to be spooling sooner but not as hard at the top end....

Fuel will take time to figue out if its better.... As i was punching it heaps today hence a big drop in fuel....

[Cubes]

No excesive fuel out the back when i boot it....

Seem to be spooling sooner but not as hard at the top end....

<{POST_SNAPBACK}>

The 02 sensor doesn't affect what you have imagined.

The 02 sensor is used to tweak afr's at light throttle cruise.

The ecu ignores its output once you stick your foot in to it.

Anything more than limping around it will turn off and use the values from the map within the ecu.

Edited December 16, 2005 by Cubes

[Col-GTSX]

Well thats what happened....

Seems to be using more fuel at this stage... But yeah as explained its more punchy and is not spewing fuel out the back...

I understand the function of a 02 sensor and have a apexi tt which measures and monitors o2 sensor voltage...

It changes all the time... Your ecu always reads the o2 sendor... Under full load you can reach around 4.3 volts

Idle you get down to 1.2v...

Either way you wanta look at it... The fact remains that it is smoother due to the old one not being able to read more than 3volts....

[benl1981]

Um - you shouldnt be seeing 4.3 volts. Max you should see is

1v!!!

Edited December 16, 2005 by benl1981

[Cubes]

Yer your way off Col-GTSX. Go back and do some more reading/googling.

Sorry Buddy.

The O2 sensor operates between 0 and 1v and trims the ecu's internal fuel map so the afr hangs as close as possible to stoich (14.7:1).

It can only trim so much, so if you raise fuel pressure or run larger injectors you will find it will simply not work and constantly idle and cruise very rich.

Should the o2 sensor die the ecu will run off the ecu's internal fuel map that is generally slightly on the rich side BUT within the o2 sensors capability to trim enough fuel out to bring the afr's to stoich.

1v being rich 0v being lean. From memory 0.9v is somewhere around 12:1.

The ECU only uses the o2 sensors output at light throttle positions. Nothing to do with wot so it WILL NOT make the slightest difference to fuel spewing out the back.

My RB30DET drops out of closed loop just after the TPS reads 1v.

1v is bugger all when it comes to throttle positions. It does vary slightly but almost always very close low 1v. This is the TPS (Throttle position sensor).

The highest I've seen the o2 sensors voltage hit on the pfc h/c is 1v at approx 4000rpm on the untuned rb25det pfc base map at WOT.

When it does this I do see fuel out the revision mirror if I catch it at the right time.

To help you understand the workings a little better you can have a look at a few datalogs I have taken via the datalogit a few weeks back.

Thats if you wish.

Edited December 16, 2005 by Cubes

[The Dan]

Yeah, I also agree. Only operates between 0-1v. Even if it did operate at a higher voltage the ECU wouldn't react any different as it is programmed to react to voltages between 0-1.

[Col-GTSX]

I just given you the results...

I dont understand how it could change it so much...

Im just telling everyone what happened on my car... Checked with a volt meter

Yes it goes up to 4.3 volts...

Not saying i know more than you i just know whats happening on my car at the moment....

[justin911]

col i've got the exact same o2 sensor as you... the rox one..

when you test it with a volt meter thingy your testing it at the actual wires coming off the o2 sensor right ??

is it possible you got the wrong o2 sensor ?? if its showing more than like 1v and your testing it at the actual o2 sensor it sounds like its not the correct sensor ???

[Col-GTSX]

tested at the blue wire out of the sensor...

the other 2 wires are the heater wires...

is on the box "ACA OX207"

does not have the R but it is for an el falcon... So i assume its the same....

[justin911]

col have you got another sensor to test ??

it sounds like that one isnt the correct one..

It doesnt sound right that it could be something in your car stuffing up the o2 reading if your getting the wierd reading from the wires coming off sensor its self..

also i dunno bout that ox-207 one.. I know mine was rox-207 if that makes any differance......

[Col-GTSX]

LOL LOL LOL LOL

I made a boo boo...

I was actually testing from the ecu using a power meter in conjunction with my ID-III and it was showing afm voltages....

HAHAHAHAHAHA

The O2 sensor is fine.... Reading less than a volt... Very frequent changes between .3 & .6 area.... So my bad...

As for my results, they still remain the same...

NOTE: I am using more fuel but the new fc tune ill request for a nice easy tune not an outright power tune...

If i want speed ill jump on the R6....

[NICKS33]

hey guys just changed my o2 sensor with the rox-207 one....car started perfectly straight away unlike alot of people?...

i was getting about 280-320 km's out of a tank...ill let u guys/girls know how i go in a week whan i use a full tank.....hers hoping 400km's

[RANDY]

I don't think anyone was having starting issues? Definately let me know though, Nick... cause I am still getting that sort of economy.