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hiimkam Profile
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Date Registered: 11-2008
Location: Perth
TOTAL POSTS: 414
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Aftermarket headers - 2nd O2 sensor hole coverup


Hey folks, I've ordered my OBX 4-1 headers from online the other day, now the thought has turned more to installation.

The headers I've bought, along with almost every other set of QR25DE headers out there, have two O2 sensor holes, because they belong to the spec-V which have said number of sensors.

Since we (x-trails) only have one O2 sensor, whats the best way to cover up the other one?

Also, the two sensor holes are located 1) on cylinder three and 2) where all the tubing joins in together. Any preferences on which one to use?

Thanks.



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GT2860rs, Ems stinger, tial external gate, 3" exhaust, 10psi and ~200kw @ all fours. Koya drifteks w/245/50 rubber, 70mm lowered springs, slotted rotors and painted calipers :)
20/Jan/2009, 9:04 pm Link to this post Send Email PM   Send Private Message MSN
 
jalalski Profile
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Date Registered: 02-2004
Location: SUTHERLAND, SYDNEY
TOTAL POSTS: 29094
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Re: Aftermarket headers - 2nd O2 sensor hole coverup


Cam,

The newer model xtrails from 2006 and up have two O2 sensors and you could have requested the shop you bought it from to cover the extra O2 sensor hole for you or weld it up. It can be covered with a bolt going through the threaded hole of the O2 sensor.

Your O2 sensor needs to measure the temperature of the entire engine block, as such it needs to go on the pipes coming from cylinders 2 and 4 (depending on the configuration of the headers like 4-2-1) In your case and since they're 4-1 configuration, you would use the O2 sensors position where all pipes join into one.

Are the headers stainless steel or mild steel?

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20/Jan/2009, 9:31 pm Link to this post Send Private Message MSN Blog
 
Robbo0001 Profile
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Date Registered: 07-2008
Location: Brisvegas, Australia
TOTAL POSTS: 1063
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Re: Aftermarket headers - 2nd O2 sensor hole coverup


Gday Cam,
I would (depending on the material) Mig/Tig etc weld up/ seal cylinder 3 position and run with the O2 position in the main body of the extractors, as Jalal suggested. You might need to extend the wiring to the sensor once the extractors are in, so you can install it the sensor lower down the manifold... if need be. Thats bugger all
Do the OBX come with a CAT, or is it straight through the down pipe and out?
Cheers

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Dave
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20/Jan/2009, 10:02 pm Link to this post Send Email PM   Send Private Message
 
hiimkam Profile
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Date Registered: 11-2008
Location: Perth
TOTAL POSTS: 414
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Re: Aftermarket headers - 2nd O2 sensor hole coverup


Jalal,
They said they are stainless steel with ceramic coating.

Not sure about the ceramic coating, but im pretty sure stainless steel is pretty tops.
How big is the hole for the O2 sensor? Cos that option of finding a bolt to screw into it sounds pretty appealing...

Dave,
the OBX doesnt come with a CAT, were purchasing that separately and gonna have it placed just after the headers..

As for the rest.
Were planning a 2.5in system with a stainless steel high flow CAT just after the headers, bullet resonator just after and a cannon muffler just before the tail pipe.
Not sure on sizes yet.

P.S. thanks for the eyelids jalalemoticon

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GT2860rs, Ems stinger, tial external gate, 3" exhaust, 10psi and ~200kw @ all fours. Koya drifteks w/245/50 rubber, 70mm lowered springs, slotted rotors and painted calipers :)
20/Jan/2009, 10:42 pm Link to this post Send Email PM   Send Private Message MSN
 
jalalski Profile
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Date Registered: 02-2004
Location: SUTHERLAND, SYDNEY
TOTAL POSTS: 29094
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Re: Aftermarket headers - 2nd O2 sensor hole coverup


Cam,

If they're stainless steel AND ceramic coated then it's a winner, but if they're not ceramic coated then you gonna have to do something about that before fitting them cause the heat they generate will be unbelievable and will impact your fuel economy.

Am not sure about the size of the O2 sensor hole. When you get it you'll be able to match it up.

Glad you liked the eyelids.

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20/Jan/2009, 10:53 pm Link to this post Send Private Message MSN Blog
 
NissanTaylor Profile
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Date Registered: 06-2008
Location: Canberra, ACT
TOTAL POSTS: 244
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Re: Aftermarket headers - 2nd O2 sensor hole coverup


this should work HERE . its a bung with an allen key head (you wont need the threaded piece). should be about $20 cos i couldnt find them in aussie ebay. or the next thing is use those thread measurements and go to a bolt shop and buy the same thing for cheaper.


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X-897
My Old Platium 07 STS Xtreme - Click Here to check out my mods and pics
Now own a Black C34 Nissan Stagea RS4-S
21/Jan/2009, 2:01 pm Link to this post Send Email PM   Send Private Message
 
hiimkam Profile
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Date Registered: 11-2008
Location: Perth
TOTAL POSTS: 414
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posticon Re: Aftermarket headers - 2nd O2 sensor hole coverup


Just bought that thing, for a grand total of 15.95...
thanks for the good find!

also, ive had a change of heart, i think ill leave the O2 sensor hole uncovered, ill end up with a mad screamer pipe over about 5000rpm haha
joking...



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GT2860rs, Ems stinger, tial external gate, 3" exhaust, 10psi and ~200kw @ all fours. Koya drifteks w/245/50 rubber, 70mm lowered springs, slotted rotors and painted calipers :)
22/Jan/2009, 9:34 am Link to this post Send Email PM   Send Private Message MSN
 
jalalski Profile
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Date Registered: 02-2004
Location: SUTHERLAND, SYDNEY
TOTAL POSTS: 29094
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Re: Aftermarket headers - 2nd O2 sensor hole coverup


I justed checked the OBX headers and they're definitely not ceramic coated and I advise you to stay clear from the using that wrapping crap on the headers as it will crack them. Get the job done properly right from the start so you don't have to worry about any headaches later on because removing and fitting the extractors in place is one hell of a job.

Last edited by jalalski, 22/Jan/2009, 9:45 am


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22/Jan/2009, 9:44 am Link to this post Send Private Message MSN Blog
 
Revhead Kev Profile
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Date Registered: 10-2006
Location: Mona Vale, Sydney, AUSTRALIA
TOTAL POSTS: 5976
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Re: Aftermarket headers - 2nd O2 sensor hole coverup


One solution might be to get some mounting points tig/mig welded onto the headers for the original heatshield.

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Kev X450(c) T30 Guru
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22/Jan/2009, 12:56 pm Link to this post Send Email PM   Send Private Message Blog
 
hiimkam Profile
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Date Registered: 11-2008
Location: Perth
TOTAL POSTS: 414
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Re: Aftermarket headers - 2nd O2 sensor hole coverup


Yeh not looking forward to installing them at all.
but at least weve got 2 pairs of hands...

In terms of heat control, i might give kev's idea a shot.
Since well have a portable welder with us it seems like a good thing to do, plus, i havnt seen the mounting points but they might be big enough to hacksaw them off the stock headers, give them a grind and touch up and weld them on the newies?
Any merit to that idea at all?
some hardware store might have something similar we could use anyway

As for the wrap, i did some more research and have decided to scrap that idea.
Bugger about the ceramic coating deal, the heatshield will do fine i figure.

I've sorta done the handball with all this, my mate is sorting everything out in terms of logistics.
Anything else to think of?
With the gasket...
is it advisable to use some gasket glue to seal the gasket when re-installing?
Especially if the gasket is new?

And what about "run-in" period for the new system?
would it all ready to go or should i drive like a sedated nanna or is it cool to use the right foot diligently asap?

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GT2860rs, Ems stinger, tial external gate, 3" exhaust, 10psi and ~200kw @ all fours. Koya drifteks w/245/50 rubber, 70mm lowered springs, slotted rotors and painted calipers :)
22/Jan/2009, 10:18 pm Link to this post Send Email PM   Send Private Message MSN
 


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