91 SR20DET O2 sensors - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

EvLSpectre · 08-13-2018, 02:20 PM

Well.....the title says it. I know these cars are supposed to be single O2 because OBD2 was not a thing till like 95. Car was a DE and then turbo swapped, and has its normal O2 sensor just after the turbo on the down pipe. There is a second sensor plugged into the cat though. Car was imported in, and said it was ROM tuned, which I believe cause it has SARD 550cc injectors and the Z32 MAF, so would the tuner add on that extra sensor?

jedi03 · 08-14-2018, 08:53 AM

usually second 02 sensor is just for air fuel monitoring...so in essence to help with tuning

*brndck* · 08-14-2018, 09:24 AM

trace the wiring. usually people will mount the o2 sensor for a wideband gauge on the "cat" or "test pipe"

EvLSpectre · 08-26-2018, 06:49 PM

Sorry, I been busy with work. But I just swapped over the pipe for the ISR test pipe. It also turns out that the cat...if you can even call it that on was punched out. Shes been normal-ish but after the Pittsburgh car meet, on the way back she was complaining bad. Breakup and sputtering. Cannot find any ROM tuners for me around here though, until I get the S-AFC.

08-13-2018, 02:20 PM	#1
EvLSpectre Join Date: Dec 2017 Location: Pittsburgh, PA Age: 30 Posts: 11 Trader Rating: (0) Feedback Score: 0 reviews	91 SR20DET O2 sensors Well.....the title says it. I know these cars are supposed to be single O2 because OBD2 was not a thing till like 95. Car was a DE and then turbo swapped, and has its normal O2 sensor just after the turbo on the down pipe. There is a second sensor plugged into the cat though. Car was imported in, and said it was ROM tuned, which I believe cause it has SARD 550cc injectors and the Z32 MAF, so would the tuner add on that extra sensor?

08-14-2018, 08:53 AM	#2
jedi03 Nissanaholic! Join Date: Jul 2008 Location: albuquerque Posts: 1,836 Trader Rating: (8) Feedback Score: 8 reviews	usually second 02 sensor is just for air fuel monitoring...so in essence to help with tuning

08-26-2018, 06:49 PM	#4
EvLSpectre Join Date: Dec 2017 Location: Pittsburgh, PA Age: 30 Posts: 11 Trader Rating: (0) Feedback Score: 0 reviews	Sorry, I been busy with work. But I just swapped over the pipe for the ISR test pipe. It also turns out that the cat...if you can even call it that on was punched out. Shes been normal-ish but after the Pittsburgh car meet, on the way back she was complaining bad. Breakup and sputtering. Cannot find any ROM tuners for me around here though, until I get the S-AFC.