slow ride

Does the bung for a wide band need to be in front of the cat or can it go in the y-pipe after the cat? Thanks

M_T_0

in front the cat affects the o2 in the exhaust

More Than Zero

slow ride

What does that mean?

Mike00FRC

iTrader: (1)

He probably intended to have a period in there.

In front. The cat affects the o2 in the exhaust.

txhorns281

iTrader: (12)

i always wonder when someone types like that if they speak the same...

If you have cats, you want to place your wideband o2 in front of it so that it will take readings from an uninterrupted, true exhaust content... Cats distort wideband readings and functionality... hope this helps...

slow ride

This does help thanks. But it makes me wonder about the A/F reading taken at the dyno Saterday. They just put a small tube with a vacum pump in the exhaust tail pipe. they Said it just sucks it out. The A/R reading can't be correct.

foff667

iTrader: (2)

if at all possible your probably better off putting the sensor in front BUT from what ive read cats when overcome with fuel dont work nearly as well and the ratio at that point becomes more accurate...just from what ive read/seen on an aussie ls1 board.

txhorns281

iTrader: (12)

I'm not 100% sure but I think dyno o2s are heated... Otherwise there's no way they'd be able to get accurate readings all the way back in the tailpipe... If you have a heated o2 (LM-1 unit) then I think you can take readings from most anywhere... (at least that's what innovate told me)

M_T_0

I'm so sorry

I was at work, on a break and typing fast,
I did not have time to proof read the post.

so if you can ever forgive me here are a few more periods to make up for it

.................................................. .................................................. .................................................. .................................................. ........................................

More Than Zero

txhorns281

iTrader: (12)

just pokin some fun

narcszm

for scientific purposes I put a bung before and after the catalytic. I tried both and the O2 sensor is effective in both places. I cannot discern that the cat affects the reading significanly with the oxygen sensor in either location. I am using an LM-1.

Mike00FRC

iTrader: (1)

Both part throttle and WOT? If so, that may solve all my problems.

narcszm

yeah, everywhere. the mean value on both logged runs was 14.81

marc_w

That sounds great... Both of my cats already have bungs on the can itself, before and after. The "afters" are free to use.

tici

iTrader: (1)

Great info narcszm!
Ther's a lot of opinions about that on the web but nobdy was able to make a clear statement.

M_T_0

no offence taken bro just having some fun also

More Than Zero

Phoenix 5.7

iTrader: (7)

with no cats, would it be good to mount the bung where the y converges?