Ka24de-t stock o2 sensors - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

Loomis112 · 10-01-2015, 08:30 PM

Do I need the stock o2 sensors if I am gonna run an AFC?

I can't find much info on this.

KAT-PWR · 10-01-2015, 09:12 PM

No you need to kill yourself if you run an SAFC

Go here
http://rs-enthalpy.com

Loomis112 · 10-01-2015, 09:14 PM

Okaaaay...

So do I need factory o2 sensor's with a rom tune? lol

Chaluska · 10-01-2015, 09:42 PM

regardless what you go with, you will always need a front o2 sensor. that is the only way the computer knows how rich or lean the car is running.

with a tuned ECU you can eliminate the rear o2 "catalytic convertor" sensor.... but you will ALWAYS require one front O2 sensor.

Loomis112 · 10-02-2015, 12:09 AM

Thanks man.

Kingtal0n · 10-02-2015, 06:44 PM

well you dont need an o2 sensor at all. Not need. The engine will run fine without it.

It does help your economy if you do not know how to tune cars though, or how engines work. I have a wideband (NOT connected to my computer, so my computer has "no oxygen sensor") and I use my wideband to dial in my desired a/f ratio, which often deviates from the factory narrowband sensor anyways. So Need one? Nay, but the less you know about the engines/tunig, the better off you are with one...

Just keep in mind a few things about OEM narrowband O2 sensors;
1. they nearly all the same. You can go into a pep boys and look through the 1000's of boxes they have in the back and 99.9% of the oxygen sensors off the shelf will work fine in your engine
2. To add to #1, often if I need an O2 sensor, I go into the above type of store and buy the cheapest one, often a 1-wire o2 sensor from a 1980's chevy V8.
3. They only work during cruise situations, or similar. It is strictly an economical value, it does nothing for performance.
4. WHen using larger injectors and more sloppy fuel tables they might become a burder/bothersome. In other words, the ecu makes "step adjustments" to fueling based on O2 feedback, and the larger your injectors are, the larger each "step" is, often leading to overcompensation at low RPMS (thus flooding the engine and stopping it). for example: often, 740cc injectors cannot be used with an OEM type ECU at idle with O2 feedback enabled around stock 850rpm.

If you are serious about oxygen sensors, you get a wideband, and if you are super serious, you wire the analog output from your wideband to the narrowband input on your ECU and set your simulated narrowband output to more desirable a/f values. I recommend something like this if you have a large injector: [ 0.005v = 15.1:1 ; 0.995v = 14.6:1 ]

10-01-2015, 09:12 PM	#2
KAT-PWR Nissanaholic! Join Date: Dec 2011 Location: US Posts: 2,040 Trader Rating: (11) Rides Gallery: KAT-PWR Feedback Score: 11 reviews	No you need to kill yourself if you run an SAFC Go here http://rs-enthalpy.com __________________ MRP Manufacturing

10-01-2015, 09:42 PM	#4
Chaluska Zilvia Addict Join Date: May 2008 Location: Missouri City, TX Age: 41 Posts: 997 Trader Rating: (2) Feedback Score: 2 reviews	regardless what you go with, you will always need a front o2 sensor. that is the only way the computer knows how rich or lean the car is running. with a tuned ECU you can eliminate the rear o2 "catalytic convertor" sensor.... but you will ALWAYS require one front O2 sensor. __________________

10-01-2015, 08:30 PM	#1
Loomis112 Zilvia Member Join Date: Jan 2014 Location: USA Age: 30 Posts: 213 Trader Rating: (0) Feedback Score: 0 reviews	Ka24de-t stock o2 sensors Do I need the stock o2 sensors if I am gonna run an AFC? I can't find much info on this.

10-01-2015, 09:14 PM	#3
Loomis112 Zilvia Member Join Date: Jan 2014 Location: USA Age: 30 Posts: 213 Trader Rating: (0) Feedback Score: 0 reviews	Okaaaay... So do I need factory o2 sensor's with a rom tune? lol

10-02-2015, 12:09 AM	#5
Loomis112 Zilvia Member Join Date: Jan 2014 Location: USA Age: 30 Posts: 213 Trader Rating: (0) Feedback Score: 0 reviews	Thanks man.

10-02-2015, 06:44 PM	#6
Kingtal0n Post Whore! Join Date: Jul 2005 Location: South Florida Age: 41 Posts: 4,829 Trader Rating: (17) Feedback Score: 17 reviews	well you dont need an o2 sensor at all. Not need. The engine will run fine without it. It does help your economy if you do not know how to tune cars though, or how engines work. I have a wideband (NOT connected to my computer, so my computer has "no oxygen sensor") and I use my wideband to dial in my desired a/f ratio, which often deviates from the factory narrowband sensor anyways. So Need one? Nay, but the less you know about the engines/tunig, the better off you are with one... Just keep in mind a few things about OEM narrowband O2 sensors; 1. they nearly all the same. You can go into a pep boys and look through the 1000's of boxes they have in the back and 99.9% of the oxygen sensors off the shelf will work fine in your engine 2. To add to #1, often if I need an O2 sensor, I go into the above type of store and buy the cheapest one, often a 1-wire o2 sensor from a 1980's chevy V8. 3. They only work during cruise situations, or similar. It is strictly an economical value, it does nothing for performance. 4. WHen using larger injectors and more sloppy fuel tables they might become a burder/bothersome. In other words, the ecu makes "step adjustments" to fueling based on O2 feedback, and the larger your injectors are, the larger each "step" is, often leading to overcompensation at low RPMS (thus flooding the engine and stopping it). for example: often, 740cc injectors cannot be used with an OEM type ECU at idle with O2 feedback enabled around stock 850rpm. If you are serious about oxygen sensors, you get a wideband, and if you are super serious, you wire the analog output from your wideband to the narrowband input on your ECU and set your simulated narrowband output to more desirable a/f values. I recommend something like this if you have a large injector: [ 0.005v = 15.1:1 ; 0.995v = 14.6:1 ]