tfnaaf

iTrader: (2)

Ive been asked about how to do this process on more than one occasion and have been happy to supply the information. Hopefully someone will add this to the FAQ on turbos to help save some members some time ......

These are NOT my photos but im unsure of who the owner is exzactly. But they do give some very good photos and i hope that they dont mind






You now need to drill out 1 of the non foulers using a 1/2" drill bit. When finished this is what it will look like.




o2 Sensor inserted in the modified non fouler


Second, unmodified non fouler now installed on modified non fouler, then threaded into the downpipe

03-Acura-1.7-EL

iTrader: (14)

I think you already had same thread sometime back. I've used your info to built same thing.
Can say its your own ?

Spoolin

iTrader: (3)

good post. i saw this on some ep3 forum a while back and did this same thing. works great

nick95673

iTrader: (13)

how does this work? It just picks up less emmission gasses since its further back?

kornsined

iTrader: (7)

has been working great for 8 months.

tfnaaf

iTrader: (2)

Im hoping it to get added to the FAQ i know its sorta a pre-post

drunkenmagnum

iTrader: (5)

awsome! i think i am the member that finally pushed him over the edge!

tfnaaf

iTrader: (2)

Nahhh, you were just the more recent person to ask But if we can get a mod to add this to the FAQ it will save people time i hope

Pedro Lopes

iTrader: (2)

You do this to the first 02 sensor right ( The one before the cat).

tfnaaf

iTrader: (2)

The second O2 sensor NOT the first!

skipbarber

iTrader: (34)

lol, if you did this to the first o2 sensor, youd be throwing all sorts of codes.

Havok2k1

iTrader: (3)

Added for ya

v8eaterokv6

iTrader: (3)

so what does this do exactly or how does it work

tfnaaf

iTrader: (2)

it restricts the amount of exhaust that gets to the second o2 sensor. This gives it a higher AFR reading. This simulates the cat doing its job when its not there

texascivic2k1

iTrader: (10)

That is exactly how it works... (Correct me if I am wrong)

Very GOOD Post!!!! I have done the same thing with mine. I have been threw two state inspections and has lasted a year and a half. I have that Megan Racing down pipe by the way. Great job!

texascivic2k1

boricua_civic

I bought a casper 02 sim from Hivtec a while back, he's from PR too, and it was cheap and the B!tch engine light is off

drunkenmagnum

iTrader: (5)

oh be sure to get the 18mm and not the 14mm. i accedently got the wrong ones the first time.

5.0calypso93lx

This works great, put it on when i installed a megan test pipe on my g/f's car last night, no cel. Sounds killer too.

Kingnine

This tip quite possibly saved my sanity. KUDOS!
Works great on my ebay special catless downpipe...!

ncirom2003

iTrader: (7)

so now lets say i do this, could it potentially cause tuning issues because the ecu is reading incorrect data and adjusting a/f ratio off of it, or does the ecu only adjust a/f according to the first o2 sensor?
i think im gonna try it.

tfnaaf

iTrader: (2)

The ecu only adjust AFR off of the first O2 sensor

nighthawk1903

I Have 3 02 Sensors so i use this on the 2nd one, before the cat, and the third one after the cat right????

skipbarber

iTrader: (34)

you have 3?? stock? either way, you want to use it on the one after the cat only.

nighthawk1903

I have a HX with a EX header an testpipe conversion now my header has 2 02 sensors top an bottom.an my cat has one after, my stock manifold had a honeycomb like resonator on it i might get some pics if need be,an the cat had one, so i have 1 02 bypass in the testpipe check engine light (STILL ON)..... I didn't drill it out could this be why???? an what would happen if i put it on the lower 02 sensor ????????/

tfnaaf

iTrader: (2)

Im so confused by what your saying. .......This is how it should be.

First O2 sensor in manifold closest to the cyl head

Second O2 sensor further down pipe , past cat converter( if you have one )THIS IS THE ONE THE FOULERS SHOULD BE ON AND YES IT MUST BE DRILLED OUT OR THE O2 SENSOR WOUNT FIT IN IT!
Third O2 sensor......... Unless its a wideband i have NO idea what your talking about

ncirom2003

iTrader: (7)

cant a shop do something while the cars being dyn0-tuned so that the cel will never come on for cat codes?

XSRCivic

iTrader: (19)

What are they going to do? Only way to remove a CEL is to fix the problem or trick it into thinking you fixed the problem which this does. You could go with the AEM EMS which you can disable ob2 completely.

I would like to do this mod myself but I'm limited to space where my downpipe is. Anybody got an idea on how I could make an angled part fit with the same purpose?

ncirom2003

iTrader: (7)

f#ck the ems!
i dunno i just heard from a friend that they can do this.

Kingnine

ok so i did this. i drilled it out right and everything, but i can't make it thru a tank of gas now without a cel. i went to autozone... code was p139 slow response...? HELP.

MajinB

iTrader: (21)

ok, here is a q for ya, if i get a high flow cat, will i still need to do this?