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stevo0525GT 01-10-2013 09:11 AM

Aem wideband install?
So just curious b/c checked other forms always got different answers so I figured I'd check and see what everyone says. I am catless. So I already deleted the code for the rear o2 sensor with my Cobb ap. could i just replace that o2 sensor with the one connected to the wideband? Or would I need to weld on the die pipe keeping that connected still?

Max Capacity 01-10-2013 11:06 AM

I have heard 12-18" from the turbo.

I would ask the Tuner who is going to be using the wideband for tuning where he wants you to stick it.

I just checked some old civic pictures, ours was about 9" from the V band at the turbo so that put it about 12" from the wheel.

Nolmers06LGT 01-10-2013 12:27 PM

Does this mean the extra bung on a CNT downpipe is a bad location for a wideband? Can it be used strictly for tuning purposes?

stevo0525GT 01-10-2013 02:29 PM

I looked it up on aems website and they said the weld should be 36 inches if running high boost or high rpms for a long period of time.

Nolmers06LGT 01-10-2013 02:44 PM

I'm guessing this is to protect the sensor from high egt's?

stevo0525GT 01-10-2013 02:45 PM

Yea I believe so

Max Capacity 01-10-2013 02:50 PM

There you go, just read the directions.

stevo0525GT 01-10-2013 04:30 PM

Yep I just wanted to know if it made a difference since I am catless and deleted the code for the o2 sensor. So I wouldn't have to weld into the dp but I guess it's inevitable.

Max Capacity 01-11-2013 07:53 AM

You casn get bung's from the auto parts store or muffler shop.

06silvarubiLGT 01-11-2013 08:03 AM

I got one welded in cost me about 35$

ScottFW 01-11-2013 09:47 PM


Originally Posted by Max Capacity (Post 4240084)
I have heard 12-18" from the turbo.

To nitpick, it's not how far the sensor is from the turbo that matters, because the turbo is not the heat source. What counts is how far it is downstream of the exhaust valves. The length of Subie manifolds and uppipes means that anywhere post-turbo is already a good bit downstream, whereas this isn't always the case on inline 4 cyl engines with their typically shorter exhaust manifolds.

Farther is better from a heat standpoint but the tradeoff is slightly longer latency at lower exhaust velocity (idle and low rpm), and if you mount it behind the cat it will read 0.5-1.0 points leaner than before the cat. Any tuner who's charging money should know how to adjust for that though.


Originally Posted by Nolmers06LGT (Post 4240276)
Does this mean the extra bung on a CNT downpipe is a bad location for a wideband?

I have an Innovate LC-1 in my Miata, with sensor mounted in place of the stock narrowband which is less than 18" from the head. No problem on the street but the sensor ocasionally overheated during track sessions. Given that experience, the sensor bung right behind the turbo on CNT downpipes is probably closer than ideal, but I'd run it there for a while and see if I noticed problems with it overheating (don't know how AEMs react but if my LC-1 overheats the gauge will freeze at 15:1 AFR). If it overheats you can try putting a heat sink on the sensor before you commit to pulling the DP and having a new bung welded in. The thick copper sheet versions do pretty well, something like this: &hash=item45fc945ed5&vxp=mtr

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