Doug Thorley info needed.

Quick question. I know the DTLT's eliminate the Cats. Soo, what did those who are running this set up do with the rear sensors. Are they still pluged in? And if so do they need to be?

I need to run a wideband sensor, and Gadget's suggested area for mounting it is at the Y-pipe. Which is cool, because I did not want to weld into my new Headers.

What I was thinking of doing is capping both bungs in my URD Y-pipe with the Bung caps URD provides. Then, when ready to set up my A/F meter just screw the Bosch wideband plug on the passenger side bung. No extra welding needed.

Let me know if im smoking crack or something, but I am pretty sure that the rear O2 sensors are no longer neccessary to be mounted.

Thanks...

 

Well, I would never want to remove any sensor from my truck. Just because.

I kept the stock y-pipe, and put on the LTs. Then I put on the O2 Simulator.

Everything is fine now.

Before I put the simulator on, I had the check engine light.

I don't know enough about the wideband sensors to give you awesome advice on the subject.

And I REALLY am not sure if the sensors are completely necessary for correct engine performance.

I suppose that taking Gadgets advice is probably the best. He knows his way around all of the products, and when I have talked with him, he gave me good information.

 

Do not do that because the rear sensors are for measuring emissions aft of the catalytic converters. If you plug your wideband sensors there, you will be getting completely innaccurate readings. You need to weld a new bung BEFORE the cats to get accurate o2 readings.

What you need to do with your stock rear bungs is bolt them up, sell the stock 02 sensors for a little cash, and attach an o2 simulator to the remaining harness.

 

If u have dt long tubes on, ur rear sensors are useless cuz u already know u're short 2 cats. Jus take them out if u want n sell em. But be sure to bolt the bungs back up

 

LOL, you confused me for a second there. But I guess you see my point. I just want to make sure that completely removing the O2 harness at the clip underneath the truck will not effect any electrical issues, ie short or something. Im not worried about the CEL, that's all taken cared of

 

I suppose that taking Gadgets advice is probably the best. He knows his way around all of the products, and when I have talked with him, he gave me good information.[/quote]

Not to mis quote Gadget. His only suggestion was to place the wideband after the flange where header and Y-pipe meet. Im just curious as to wether I can save time and labor, and just reuse Bung on Y-pipe. I guess most people leave the sensors in cause they dont have anything to cap the bungs. The sensor is inopperable once you splice in the O2 simulator, I think

 

If u have long tube headers, you dont need o2 sensors AFT of the remaining cats. Unplug them, remove them, unclip them, sell them, trash them, watever u wanna do, you just dont need them anymore

 

Awesome,

Thanks Blackhawke...

 

Most important with your original post is do NOT install an o2 sensor for a wideband or air fuel gauge AFT of ANY cats. Cats will change your exhaust composition, and o2 readings aft of your cats are useless for gauging engine performance. After cat exhaust readings are more for carbon monoxide/emissions/smog readings.

 

Roger that. To clear up any confusion for other members:

Right now I have JBA Headers and URD Y-pipe. WIll replace JBA with DTLT's. Take bung cap off JBA, and the one off the bung I just ordered.
Now I can use these to close up the Bungs in my URD Y-pipe.
I will later mount the Bosch wide band sensor I have with my LM2 kit, using the exact location where the original rear sensor was located.
All four Cats gone, Front O2 sensors intact @ original location, rear bungs shut unless monitoring A/F Ratio's.

Yeah this is a fun Mod week for me.

And from the feedback Im getting from you, I think my plan will work...

 

Ohhhhh....haha i missed the part in ur original post about u having a urd ypipe, haha, so ur completely catless. Yea u can throw ur wideband sensor in the old ypipe bungs. In fact u can put them anywhere. Haha sorry for the confusion, i thought u still had ur stock ypipe