Just looking for a general consensus on this. I always figured the wideband needs to go ahead of the cat but remember whan they tuned it at Gearheads they used the second O2 location for their sensor. Gonna check with gearheads on this tomorrow but do you guys think I should have another bung welded in before the cat or just run it in the second hole since I will be turning off them in the tune anyway?

You wanna put what,in what hole?

Weld in a new bung to mount the wideband O2 before the catalytic convertor on the drivers side OR just use the existing secondary O2 sensor location after the cat since I will not be using the stock O2s anyway?

Use existing hole....duh

Not 100% sure but I would think you could use the rear 02 bung. With them turned off in the tune, it should be fine. You see mustangs running mil eliminators all the time, so why not. If its no good, you can change it. I think it will be fine. I looked at Mark once and the rear bungs were welded shut and the o2s slung over the tranny. Needless to say I didn't buy it.

Use existing hole....duh

:q:q:q:q...beat me to it

Uh you guys are missing an important part here it seems. You are both looking at level of ease. I will be fine tuning the drive ability of my car which is the reason for putting a wideband in it. If I am tuning the car to get it as close to lean as possible without actually going lean then shouldn't I be sampling BEFORE the remaining fuel is catalyzed?

Your right pre cat is where it NEEDS to be. Sorry worked my ass of today. Not thinking clearly. Been mulling the idea of buying one of two chevelle projects I looked at.

not just thinking about level of easy but costs as well, as I know your circumstances, and I vote the cheaper choice as at least a trail..then if it works as desired leave it..if not...then we can weld a new bulg on pre-cat
and yes, it should be measured pre cat

Before the cats. Note the extra bungs I welded into my system.

There ya have it man, no saving money for you . I've gotta start saving some cash to buy a new fuel pump, but I think I need the whole unit not just a pump

A cat is designed to (amongst other things) convert nitrogen oxides into nitrogen and oxygen. So yeah, it can screw with the WBO2 reading.

Thats what I had figured, just needed to confirm it. Having a bung welded in is no big deal nor is it expensive by any means.

pre cat!

and a cheap 02 bung is a 18mm spark plug non-fouler at any parts store in the HELP section. just cut the bottom off and you are good to go.

pre cat!

and a cheap 02 bung is a 18mm spark plug non-fouler at any parts store in the HELP section. just cut the bottom off and you are good to go.
The gauge comes with a bung.

and a cheap 02 bung is a 18mm spark plug non-fouler at any parts store in the HELP section. just cut the bottom off and you are good to go.

Good tip, I never would've thought of that.