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01-26-2014
This may be a silly question, but I am running cat-less and plan on buying an AEM wideband gauge and I was wondering, is the rear O2 sensor location adequate to measure the AFR? I would hate to have to weld in a bung closer upstream.
Also, if I buy the regular gasoline version, can I later switch to ethanol with no problems? I know the sensor just measures the lambda value, but I see there are 'gasoline' and 'ethanol' versions of the gauge.
01-26-2014
You can use the rear o2 bung, but the values will be slightly different from doing it more upstream. I ended up having another bung welded into the downpipe portion for $10 since I am catted and using both narrowbands
And yes, you can use the same gauge/sensor as of their 4.2 sensor. check out the site if you want, under key features
http://www.aemelectronics.com/wideba...fuel-gauge-25/
01-26-2014
Okay thanks! I am guessing the values are slightly off because the EGT is lower downstream? Is this enough to affect the performance of the gauge or should I just do it right the first time and have the bung welded in?
01-26-2014
I'd do it right and just get the bung welded in. The gauge comes with one, any shop can weld it in for $10-15. Here are a few shots of where people put theirs.
I've got mine mounted very similarly to the bottom picture, though it is mounted a little higher up. I'm dropped just over 2" and dont bottom, so you should be just fine.
01-26-2014
I've heard of lots of people putting it in the crossover
01-26-2014
Some people have done that, but that only monitors the front bank (which assumes that your motor is running perfectly, and you dont have any misfires/fueling differences on the back bank)
I personally prefer to have it reading all cylinders, unless you are running a true dual setup and then I'd run one on each collector.
01-26-2014
If your front bank and rear bank are that far off you have SERIOUS issues . I mean even ZZPs headers have the upstream O2 sensor in the crossover.
01-26-2014
Say for example you have a slightly clogged injector on the rear bank, but your crossover wideband is only reading the front, you wouldn't see the change in your o2s and know somethings up. I agree that you'd have to have a pretty good issues to make a big difference, but I still think it's better to read all cylinders.
01-26-2014
I dont want to remove my crossover pipe, that would be a mega ***** lol.
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01-26-2014
I could have my crossover pipe out in under 30 min.
Originally Posted by The Sunfire Guy
01-26-2014
Removing it is not the problem. Putting it back together is. No thanks.
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01-26-2014
Or you could just use a step drill or torch to cut a piece out and weld the bung in. No need to remove it.
01-26-2014
Exactly... Don't take it out.
01-26-2014
Or just get it welded below the flex and be done with it.
01-26-2014
X2.
Or just get it welded below the flex and be done with it.
01-26-2014
Yeah im gonna do that. It is the most practical place
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02-01-2014
the aem o2 senser directions dictate to place it behind the converter, but since you don't have one I would still place it in approximately the same position.
02-01-2014
You want it IN FRONT OF the converter. Putting it behind the converter will throw the readings all out of whack.
02-01-2014
I had a brain keyboard disconnect, I meant to say in front
02-01-2014
It's cool. Just didn't want misinformation out there. :thumbsup:
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