ARH full system question

2018ZL1 · 12-10-2018, 12:36 PM

I have a pretty simple question about an ARH full system (no Cats) I am in the process of installing. I removed the stock exhaust and there are 4 different sensors I removed. I am installing an AEM wideband AFR gauge as well. My question is what needs to be connected back into the new catless ARH system? I would have thought something would have came with the system that discusses this but there wasn't...

I figure the AEM gauge needs to be connected but I dont know about the existing sensors that I removed...

any input is greatly appreciated!

Nino8309 · 12-12-2018, 04:55 PM

The o2 sensors closest to the engine need to stay. You can put your AEM A/F sensor in the secondary bung. Either side.

2018ZL1 · 12-13-2018, 04:06 PM

Quote:

Originally Posted by Nino8309

The o2 sensors closest to the engine need to stay. You can put your AEM A/F sensor in the secondary bung. Either side.

Thanks for the reply! I did ask my tuner and he said to hook the 4 existing sensors up and install another bung for the A/F sensor... I like your idea better! This headers have bungs as well as the exhaust pipe... I was told by another person that I didnt need the rear ones as well... :/

EGOKLR · 12-14-2018, 12:07 PM

You're going to want your wideband sensor in the header for the most accurate reading. Approx 18"-24" from the cylinder head.

2018ZL1 · 12-14-2018, 03:40 PM

Quote:

Originally Posted by EGOKLR

You're going to want your wideband sensor in the header for the most accurate reading. Approx 18"-24" from the cylinder head.

OK, so my headers have bungs on them already I can use one of those for the A/F sensor. Now there are 2 more bungs located just before the X pipe, Can I use them for the sensors that were before my cats? Now what about the 2 sensors that were after the cats? Do i need them to be connected?? I would rather not have to weld anymore bungs if I dont need too!

Nino8309 · 12-14-2018, 05:22 PM

I am running cats on mine so i had to weld an extra bung in the header. Since you dont have cats i dont see why you would need them. The sensors closest to the engine absolutely need to stay there. That is what the PCM is looking at. Your car will not see your wideband it is just used for tuning or visually monitoring it. As far as the distance from the head i still would have used the rear o2 bungs if i could i just dont think it would have made that much of a difference so its up to you. I also dont permanently use my wideband, just for tuning.

TJay74 · 12-14-2018, 07:27 PM

Quote:

Originally Posted by Nino8309

I am running cats on mine so i had to weld an extra bung in the header. Since you dont have cats i dont see why you would need them. The sensors closest to the engine absolutely need to stay there. That is what the PCM is looking at. Your car will not see your wideband it is just used for tuning or visually monitoring it. As far as the distance from the head i still would have used the rear o2 bungs if i could i just dont think it would have made that much of a difference so its up to you. I also dont permanently use my wideband, just for tuning.

The closer the WB O2 is to the primary O2 sensor location the better and more accurate the reading will be.

OP just leave the rear O2 unplugged, tape up the ends of the harness and tie them out of the way. Leave the bung port plugs in and have another bung drilled and welded up front for the WB O2 sensor.

2018ZL1 · 12-14-2018, 08:13 PM

Quote:

Originally Posted by TJay74

The closer the WB O2 is to the primary O2 sensor location the better and more accurate the reading will be.

OP just leave the rear O2 unplugged, tape up the ends of the harness and tie them out of the way. Leave the bung port plugs in and have another bung drilled and welded up front for the WB O2 sensor.

That sounds like what I am gonna do! Thanks for helping out with this!

JCunningham · 12-22-2018, 12:40 AM

yes you need to put the factory front 2 censors in the front 2 holes and have a extra bung welded in like EGOKLR said. you might as well just install the rear 2 censors and plug them in. The will get turned off in the tune. That way you dont have to worry about anything getting in the plugs.

CompleteStreet · 12-22-2018, 10:50 AM

Quote:

Originally Posted by Nino8309

The o2 sensors closest to the engine need to stay. You can put your AEM A/F sensor in the secondary bung. Either side.

This is correct!

12-10-2018, 12:36 PM	#1
2018ZL1 Drives: 2018 ZL1 A10 NFG 2019 COPO 350 SC Join Date: Feb 2018 Location: Woodbine Md Posts: 686 View My Garage	ARH full system question I have a pretty simple question about an ARH full system (no Cats) I am in the process of installing. I removed the stock exhaust and there are 4 different sensors I removed. I am installing an AEM wideband AFR gauge as well. My question is what needs to be connected back into the new catless ARH system? I would have thought something would have came with the system that discusses this but there wasn't... I figure the AEM gauge needs to be connected but I dont know about the existing sensors that I removed... any input is greatly appreciated!

12-22-2018, 12:40 AM	#9
JCunningham Drives: 2017 2SS M6 Join Date: Jun 2013 Location: WNY Posts: 7,069	yes you need to put the factory front 2 censors in the front 2 holes and have a extra bung welded in like EGOKLR said. you might as well just install the rear 2 censors and plug them in. The will get turned off in the tune. That way you dont have to worry about anything getting in the plugs. __________________ real ZL1 wheels and brakes, 285/305 Michelin Pilot Super Sports, Pray ported Intake manifold, Soler Throttle Body, Rotofab intake, EFI Tuning Flex fuel kit, full American Racing Headers Exhaust, 1 7/8" w/ cats H pipe and mufflers. Full 1LE suspension, with BMR adjustable sway bars and links, GM aluminum cradle bushings, Hurst shifter with lighter reverse spring, TWM shifter knob, Tick level 1 transmission. I should have bought a ZL1

12-12-2018, 04:55 PM	#2
Nino8309 Drives: 2018 Summit white 2SS 1LE Join Date: Nov 2016 Location: Michigan Posts: 56	The o2 sensors closest to the engine need to stay. You can put your AEM A/F sensor in the secondary bung. Either side.

12-14-2018, 12:07 PM	#4
EGOKLR Drives: 2017 Camaro SS Join Date: Sep 2015 Location: Kansas Posts: 22	You're going to want your wideband sensor in the header for the most accurate reading. Approx 18"-24" from the cylinder head.

12-14-2018, 05:22 PM	#6
Nino8309 Drives: 2018 Summit white 2SS 1LE Join Date: Nov 2016 Location: Michigan Posts: 56	I am running cats on mine so i had to weld an extra bung in the header. Since you dont have cats i dont see why you would need them. The sensors closest to the engine absolutely need to stay there. That is what the PCM is looking at. Your car will not see your wideband it is just used for tuning or visually monitoring it. As far as the distance from the head i still would have used the rear o2 bungs if i could i just dont think it would have made that much of a difference so its up to you. I also dont permanently use my wideband, just for tuning.

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