hey guys ive just got one question. Is it really necessary to have a dedicated 02 bung for a wideband or can you use an existing one?

 

U need the front 02 so it can read and get your afr to stoich. without it youd be running like a honda thats riced out. like ****. lol. The rear 02 can be used, but make sure there are no leaks and that the 02 sensor is not bent or broke.

 

so i can swap the wideband 02 sensor for the stock one?

 

the aftercat 02 if you have no cat, but not the first 02 sensor.

 

it wont work with a high-flo? im running the ottp longtube headers. im trying to avoid having a bung welded in and was wondering if there was a way around it

 

you cant mount after cat as your cat will alter your afr, and you cant remove your first o2 sensor, just spend the 25 dollars and get a bung welded, you paid 400+ for the long tube headers, pretty sure u can cough up 25 more

 

lol guess i should just stop being cheap. thanks for the info guys

 

You can use the rear O2 catted or not. There have been extensive tests done that show there is minimal change in the cat altering the mixture. If anything it shows a more smooth response. While it is a better idea to place a wideband used for tuning purposes (to remove the possibility of leaking gaskets) before the cat, it is ACCEPTABLE to place it after the cat for the purposes of tuning a street car.

 

hmm.. when i was on the dyno if my wideband was showing 12 at WOT, there's was showing 0.5 to 1 different at exhaust tip ( Exhaust is welded all the way back so no leaks possible). Your choice at end of day

 

All widebands are also calibrated differently and dyno sensors tend not to last too long as they get a decent amount of abuse. If you would like a better of idea to how small of a change it is, go out and make a few runs, then swap your wideband and rear O2 locations and make the same runs. Then do a comparisaon and see how close they really are. This method was what convinced me once with my skepticism on the subject.

 

So you can use rear o2 if catless and its been tuned out?