Quick question about an S13 KA24DE header - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

Arro · 06-16-2010, 02:12 PM

Ok so I bought an S13 KA24DE header:

I'm sure lots of you have seen or even used one that looks just like it. But why are there two O2 bungs?

One of them is smaller than the other, too. So the original oxygen sensor is only gonna thread into the upper one. Which ironically came with an O2 plug (also pictured). Now I would think the better location would be the lower one, so it would be reading two runners instead of just one. But then I'm also curious which cylinder tends to run leaner than the rest, and if that's why the bung is on runner #2.

I'm sure this has come up before, but search didn't turn up anything.

?????

nicho919 · 06-16-2010, 10:25 PM

Pyrometer or a wideband o2 sensor.

blacks13coupe · 06-17-2010, 04:32 PM

I believe 1 hole is for o2, 1 hole is for egr, and 1 hole is for AIV.

projectRDM · 06-19-2010, 04:43 PM

Quote:

Originally Posted by blacks13coupe

I believe 1 hole is for o2, 1 hole is for egr, and 1 hole is for AIV.

Exactly. AIV and EGR are the same size ports.

modulation · 06-21-2010, 07:50 PM

Quote:

Originally Posted by projectRDM

Exactly. AIV and EGR are the same size ports.

The EGR is behind the manifold. The hole faces the firewall (it's the one that a tube by itself.)
The IAV is the lowest hole on the manifold. On stock exhaust it's on the lower piece. The hole faces the driver side fender.
The other hole that faces the driver side fender on the same heights as the EGR tube hole, that is in the middle is for the o2 sensor.

EGR takes hot exhaust gases during certain times and puts them back into intake manifold.
IAV takes clean air from before the MAF (the stock airbox tube) and under certain idle conditions takes "clean" air and put its before the cat to help heat the cat up during idle so it can do its job better.

As projectRDM said, the egr and IAV are the same thread.

Sileighty_85 · 06-21-2010, 10:32 PM

Quote:

Originally Posted by modulation

Dude are you a fucking moron? No they aren't.

The EGR is behind the manifold. The hole faces the firewall (it's the one that a tube by itself.)
The IAV is the lowest hole on the manifold. On stock exhaust it's on the lower piece. The hole faces the driver side fender.
The other hole that faces the driver side fender on the same heights as the EGR tube hole, that is in the middle is for the o2 sensor.

EGR takes hot exhaust gases during certain times and puts them back into intake manifold.
IAV takes clean air from before the MAF (the stock airbox tube) and under certain idle conditions takes "clean" air and put its before the cat to help heat the cat up during idle so it can do its job better.

HAHA caught you before your Ninja Edit.

*!Zar!* · 06-22-2010, 01:51 PM

Quote:

Originally Posted by blacks13coupe

I believe 1 hole is for o2, 1 hole is for egr, and 1 hole is for AIV.

Ding, ding, ding!

nismoracingsx · 06-22-2010, 02:49 PM

lol. nice.

modulation · 06-22-2010, 10:53 PM

Quote:

Originally Posted by Sileighty_85

My name is Sileighty_85 I like other men. I love them sexually

Caught you before your ninja edit.

Sileighty_85 · 06-23-2010, 10:15 AM

Quote:

Originally Posted by modulation

Caught you before your ninja edit.

what are you 8?

Arro · 06-24-2010, 01:45 AM

Quote:

Originally Posted by modulation

IAV takes clean air from before the MAF (the stock airbox tube) and under certain idle conditions takes "clean" air and put its before the cat to help heat the cat up during idle so it can do its job better.

Ok for the KA-newb, lemme ask... I have a '95 KA24DE (S14, OBD 1.5), but of course this is an S13 KA24DE header. I don't have an IAV on the '95.

Why did Nissan remove it?

projectRDM · 06-25-2010, 12:58 PM

Not needed. They realized it was more of a culprit for later problems, and by revising the cam profiles and tuning it wasn't as effective anymore. Plus, the converter is much closer to the engine on S14s, meaning it heats up much faster anyway.

xs042lol · 06-25-2010, 02:47 PM

Quote:

Originally Posted by projectRDM

Not needed. They realized it was more of a culprit for later problems, and by revising the cam profiles and tuning it wasn't as effective anymore. Plus, the converter is much closer to the engine on S14s, meaning it heats up much faster anyway.

nice, i thought it was EGR shit when i did my s14 megan into s13 header. then realized it was totally different but never looked into it. Can i just delete it with a vacuum cap for the air pipe and a resistor for the wired plugs and then cap off the vacuum lines?

tommytwo40hands · 06-27-2010, 03:49 PM

just plug the bottom hole, you'll be fine.

06-16-2010, 02:12 PM	#1
Arro Join Date: Oct 2004 Location: Inland Empire (909), SoCal Posts: 26 Trader Rating: (0) Feedback Score: 0 reviews	Quick question about an S13 KA24DE header Ok so I bought an S13 KA24DE header: I'm sure lots of you have seen or even used one that looks just like it. But why are there two O2 bungs? One of them is smaller than the other, too. So the original oxygen sensor is only gonna thread into the upper one. Which ironically came with an O2 plug (also pictured). Now I would think the better location would be the lower one, so it would be reading two runners instead of just one. But then I'm also curious which cylinder tends to run leaner than the rest, and if that's why the bung is on runner #2. I'm sure this has come up before, but search didn't turn up anything. ????? __________________ Club-S12 Admin 85 Nissan 200SX (KA24DE), 85 Nissan Silvia RS-X (FJ20)

06-25-2010, 12:58 PM	#12
projectRDM Post Whore! Join Date: Dec 2002 Location: Atlanta Age: 47 Posts: 13,812 Trader Rating: (12) Feedback Score: 12 reviews	Not needed. They realized it was more of a culprit for later problems, and by revising the cam profiles and tuning it wasn't as effective anymore. Plus, the converter is much closer to the engine on S14s, meaning it heats up much faster anyway. __________________ FORMERLY R240NA Learn what's really going on and protect your assets now before they're gone forever: www.paypalsucks.com

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06-16-2010, 10:25 PM	#2
nicho919 Leaky Injector Join Date: Jun 2010 Location: Raleigh, NC Age: 31 Posts: 51 Trader Rating: (0) Feedback Score: 0 reviews	Pyrometer or a wideband o2 sensor.

06-17-2010, 04:32 PM	#3
blacks13coupe Join Date: Feb 2007 Location: Fort Worth Age: 40 Posts: 32 Trader Rating: (2) Feedback Score: 2 reviews	I believe 1 hole is for o2, 1 hole is for egr, and 1 hole is for AIV.

06-22-2010, 02:49 PM	#8
nismoracingsx Zilvia Addict Join Date: Sep 2007 Location: Alachua, FL Age: 34 Posts: 969 Trader Rating: (32) Feedback Score: 32 reviews	lol. nice.

06-27-2010, 03:49 PM	#14
tommytwo40hands Leaky Injector Join Date: Jun 2010 Location: Springfield, MO Age: 32 Posts: 145 Trader Rating: (2) Feedback Score: 2 reviews	just plug the bottom hole, you'll be fine.