Aftermarket SR O2 housing: which O2 sensor? - Page 2 - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

SHIFT_*grind* · 09-20-2007, 07:45 AM

To clarify: I have searched the forums for this, found a lot of good info, there's just one thing that confuses me that I wanted to see if anyone could clear up.

Installed an exhaust, test pipe, and knockoff divided turbo elbow yesterday. The elbow I bought used from a guy locally, and it didn't include the fat-to-skinny reducer fitting; it DID include some random fat-type O2 sensor already screwed into it. I install the elbow, find out my SR uses the skinny type, try to use the fat type, drive the car home sputtering and spewing black smoke, etc. etc. So obviously I need to find an adapter to put the skinny sensor in the fat hole of the new turbo elbow.

I found good info here on how to tap an 18mm cap bolt for the skinny sensor. Here's where I'm confused: This thread states that only S13 redtop SRs come stock with the skinny sensor, and all others come stock with the fat type. The sensor I pulled out was a skinny type, but my SR is a 97-98 S13 blacktop. It's a stock swap. So my question is...why would I have a skinny O2 sensor from the factory? Would I stand to gain anything from running a fat type instead? (The car runs fine with the skinny type, I probably get around ~25mpg) Is it possible the car's running a redtop ECU? I only bought the car ~2 weeks ago, so I'm still learning it.

Thanks.

09-20-2007, 07:45 AM	#1
SHIFT_grind Nissanaholic! Join Date: Nov 2004 Location: NWA Age: 42 Posts: 2,066 Trader Rating: (7) Feedback Score: 7 reviews	Aftermarket SR O2 housing: which O2 sensor? To clarify: I have searched the forums for this, found a lot of good info, there's just one thing that confuses me that I wanted to see if anyone could clear up. Installed an exhaust, test pipe, and knockoff divided turbo elbow yesterday. The elbow I bought used from a guy locally, and it didn't include the fat-to-skinny reducer fitting; it DID include some random fat-type O2 sensor already screwed into it. I install the elbow, find out my SR uses the skinny type, try to use the fat type, drive the car home sputtering and spewing black smoke, etc. etc. So obviously I need to find an adapter to put the skinny sensor in the fat hole of the new turbo elbow. I found good info here on how to tap an 18mm cap bolt for the skinny sensor. Here's where I'm confused: This thread states that only S13 redtop SRs come stock with the skinny sensor, and all others come stock with the fat type. The sensor I pulled out was a skinny type, but my SR is a 97-98 S13 blacktop. It's a stock swap. So my question is...why would I have a skinny O2 sensor from the factory? Would I stand to gain anything from running a fat type instead? (The car runs fine with the skinny type, I probably get around ~25mpg) Is it possible the car's running a redtop ECU? I only bought the car ~2 weeks ago, so I'm still learning it. Thanks.