LT Headers, rear sensor question ???

[clarkkent]

Originally Posted by SSMY1LE

So by tuning out the front sensors I hope it won't affect them from operating correctly. Does that just turn the light off but allow normal operation ??
Thanks

No clue on the tuning, you'll have to ask someone more knowledgeable than me lol. I am not tuned so I have the CEL all the time

[Kendall421]

Originally Posted by clarkkent

That's weird. The reason you need them on the fronts is because on the stock manifolds the sensor is way up near the heads, on LT's the sensor is at the collector, the stock cable isn't long enough to reach.

You can see how much longer the cable needs to reach in the attached picture

Is a 1 foot extension cable enough? I am going to need to get some too.

For the O2 Sensors to the pipes, I plan to put my angled extenders coupled with straight extenders on my rear O2 sensors and see if I can get away with no codes until I can get dyno tune to tune them out.

[clarkkent]

Originally Posted by Kendall421

Is a 1 foot extension cable enough? I am going to need to get some too.

For the O2 Sensors to the pipes, I plan to put my angled extenders coupled with straight extenders on my rear O2 sensors and see if I can get away with no codes until I can get dyno tune to tune them out.

As I mentioned above, it doesn't matter what you do to the rear o2's. You will get a code. It has nothing to do with the cat's, it's to do with the further downstream location of the front o2.

[SSMY1LE]

Originally Posted by Kendall421

Is a 1 foot extension cable enough? I am going to need to get some too.

For the O2 Sensors to the pipes, I plan to put my angled extenders coupled with straight extenders on my rear O2 sensors and see if I can get away with no codes until I can get dyno tune to tune them out.

Hey Brad, here are the ones I bought. Good quality and fast delivery.
http://www.racetronix.biz/itemdesc.a...%2D24T&eq=&Tp=


These will do the job

[CFD]

Originally Posted by clarkkent

As I mentioned above, it doesn't matter what you do to the rear o2's. You will get a code. It has nothing to do with the cat's, it's to do with the further downstream location of the front o2.

So if we now move the rear O2's to the rear an equal distance as the fronts is all well or does another variable come into play.

[clarkkent]

Originally Posted by CFD

So if we now move the rear O2's to the rear an equal distance as the fronts is all well or does another variable come into play.

I'm not 100% sure on this, but I believe it's the distance between the exhaust ports in the heads and the front o2 that changes which causes this code, nothing to do with the rear o2. This was discussed previously in another thread, I forget where though

[Kendall421]

Originally Posted by SSMY1LE

Hey Brad, here are the ones I bought. Good quality and fast delivery.
http://www.racetronix.biz/itemdesc.a...%2D24T&eq=&Tp=


These will do the job

Thanks Rob!!

[Kendall421]

Originally Posted by Kendall421

Thanks Rob!!

Wrapped my headers today and in the bag with the clamps and such was a set of extenders! LOL Don't need to buy now! Yes!

[MarylandSpeed]

The green cats should not throw a code. If you are getting long tubes, you will need rear O2 extensions.

[SSMY1LE]

Originally Posted by MarylandSpeed

The green cats should not throw a code. If you are getting long tubes, you will need rear O2 extensions.

When I picked up the cats I was talking with Eric about the need for extentions and he assures me they aren't needed.
I guess only time will tell but thanks for your input !

[clarkkent]

Originally Posted by SSMY1LE

When I picked up the cats I was talking with Eric about the need for extentions and he assures me they aren't needed.
I guess only time will tell but thanks for your input !

I am 90% sure you will throw a code no matter what cats you have. It will be P015B and P015D codes, sensor delay. Nothing to do with the cat efficiency.

And you won't need extensions for the rears, I haven't read anyone that needed rear extensions, unless the green cats are in some crazy location compared to normal long tubes+HFC.

Some posts in this thread talk about it, 2013+ are the cars that have the issue http://www.camaro5.com/forums/showth...b+p015d&page=2