Oxygen Sensor Dramas - R32 Vs R33 Gtr

[drgtr7]

Guys as you know I have an r33 GTR and according to my tuner it's due for a fresh of oxy sensors.

Here's what I need help understanding..

I'm using r32 dumps which have an opening to suit 12mm sensors - I.e NTK OTD2F-1P and or standard.

From my understanding 33 and 32 use different type of sensors - zircona vs Titania . Would it be fine if I was to use Titania oxy sensors on my 33?

Btw I'm using a power fc

Any help appreciated,

Cheers

[R.3.2.G.T.R]

turn off the o2 feedback and leave it off - tune around it

[Don Dada]

You have two options...

The one mentioned above which I prefer,but takes alot more time to tune the low load/crusing section of the map which results in better fuel consumption if done properly or...

There is "O2 sensor reg." in the ETC. menu of the pfc which allows you to choose between r32 and r33 type O2 sensors.

If I remember correctly, off(+ sign) is r32 type. The info is floating around here....somewhere

[drgtr7]

Thanks for that info

[Don Dada]

Found the info. from Paul and its the other way around.....My bad,but as I said i just turn them off

apexi's official answer;

There is a difference in the o2 Sensor for these vehicles. (With or without internal register)

After tuning, please check () "O2 Sensor REGISTER" for BNR32, and NOT for BCNR33.

So off (+sign) is for r33 type sensors

[R31Nismoid]

turn off the o2 feedback and leave it off - tune around it

+1

always got better economy with it off and a good tune, and just leaving a dead sensor in there or a bung.

The factory O2 Sensors tend to fail more often in modified examples as well so better off just getting rid of the expense.

[CrimsonLey]

Threads like this one are the reason why I keep coming back to SAU.

I have a late model BNCR33 engine in my early edition BNR32.

I installed an AEM wideband and it's constantly reading rich (14+). A couple of weeks ago, I checked the spark plugs and they were very filthy with fuel. I tried my best to clean them but a friend said I should completely replace them. I'm planning on doing that but I want to find out why my GTR is running so rich.

I think I tracked the problem to my O2 sensors via a mechanic that was doing some different work on my car. I have BNR34 VSpec dumps with BCNR33 O2 sensors installed on my BNR32 Skyline. I also have a Mine's ECU that's in need of a tune or change. :-(

Do you guys think that using a stock ECU and/or changing to BNR32 O2 sensors will improve my fuel economy?

[Hadouken]

14+ afrs is lean not rich > 11 is rich

[ido09s]

First step, get rid of the Mines ECU as they arent even worth their value in scrap. A stock ECU is a far better option.

I would suggest a Link or Haltech over the standard ECU as a much better option.

[CrimsonLey]

Thanks for the clarification, Hadouken. If the spark plugs are filled with fuel, wouldn't that indicate a "rich" car?

Ido,

I don't have the stock ECU any longer. Is it possible to but a used one from the auctions and still have it work on my car?

[KiwiRS4T]

Thanks for the clarification, Hadouken. If the spark plugs are filled with fuel, wouldn't that indicate a "rich" car?

Ido,

I don't have the stock ECU any longer. Is it possible to but a used one from the auctions and still have it work on my car?

Yes you can buy a used one or a PFC... or a plug in Link or Vipec will go in the case inhabited by your Mines chipped ecu.

[Hadouken]

But it can't be rich if your wide band reads 14 afrs. Unless your gauge is Shit. Or your spark plugs have been dirty for a while.

[Badgaz]

But it can't be rich if your wide band reads 14 afrs. Unless your gauge is Shit. Or your spark plugs have been dirty for a while.

or the wide band is faulty.

[CrimsonLey]

I think that's what he meant: "your gauge us shit."

Let me ask you guys something, is it possible to go on a 4-5 hour road trip in the current state my car is in? I have to drop off my vehicle at a friends place that's quite far

[Badgaz]

the wide band sensors can crap out too not just the gauge. hard call there....if you are worried i'd say stay off boost and you should be ok....but in the end its up to you. I'd re-check your afr's if you can...seems weird you'd be 14's and have fouling plugs...check your breathers and make sure your intake isn't all gummed up with oil vapour residue etc.

[Hadouken]

If you really think its the oxygen sensors, unplug them and have a look at your afrs

[CrimsonLey]

I seriously doubt it's my wideband because it's brand new. I was paying with it while I was installing it because I thought it wasn't working. I'll check them.

[Badgaz]

it should be pretty obvious when they don't work....the one we were using that was faulty would only read down to 11's before giving no reading.... you should be running around the low 12's to low 11's on boost....strangely your car is quite like my wife's car...bnr32 with bcnr33 motor.

[nicksamaniac]

Just to confirm my own thoughts? Doesn't the o2 sensor only work during lean cruise?

I thought the ecu only uses it at lean cruise (closed loop monitoring) where it looks for the rich or lean side of lambda.

that's why it flicks around 14.5-15.5-ish back and forth as it continually looks for and aims for lambda 1.

Then when you load the engine from cruise to accelerate it will give a solid afr and richen the more load increases.

[nicksamaniac]

That's what I see on my wide band anyway,

It will sit around 14.5-16 at cruise and up to 11.2 at wot full boost. And off scale lean under de-cel.