ICeDoUt

Just wondering where the hell to weld in a new bung at(what part of the downpipe), does it have to be a certain distance away from the other O2 sensor? tried searching, but can't really find anything. Also does it matter which one is in which bung? its for a 1st gen b16 in a crx, running vafc hack

.dave

For the AEM wideband UEGO, which is a Bosch type, it said to put it at least 30-36" from the turbo but before the catalytic converter. It also recommended making sure that it is fairly close to being vertical, as condensation can collect inside and damage the sensor. This is for a wideband, correct?

ICeDoUt

the second bung is not going to be for a wideband, at least not yet, but it'll be for the 2nd o2 sensor, unless b16 turbo guys are only running one o2? i was just wondering how far apart to place them.

honda9369

why would u want to run a second o2 sensoe?

ICeDoUt

i don't want to, but would it run properly without throwing a code if i jsut run one?

honda9369

i believe u r talkin about the secondary o2 sensor,right. and do u have a obd2 motor?

ICeDoUt

noooooo, pre OBD (obd0)

honda9369

then no u dont need the secondary o2

ICeDoUt

but then i'll throw a code and i won't have vtec? well actually i would still have vtec becuase of the vafc. I thought that it would run like **** if i didn't have a 2nd oxygen sensor.

honda9369

secondary wont make your car run shitty. and has nothing to do with vtec

mrx

You are wrong, the OBD0 B16A Engine needs two o2 sensors. i have the same problem as well.

my current sollution is to connect the two o2 sensor lines to one o2 sensor. so you have a not so perfect closed loop but it is good enough to drive and you don't throw the cel.

if you want a perfect sollutoin for the b16 then you need two o2 holes in the manifold befor the turbo like the original manifold has.

PS: If he has an cel for the o2 sensor, vtec will be disabled, so this is not unimportant

Greets
Malte.

crx2fast

you two are also wrong. i have an OBD0 b16 in my crx and im running 1 O2 sensor. it runs fine. the check engine light will come on sometimes, usualy never. but when it does it dosent hurt the performance of the car at all. i also have a DC header with a single bung, like a foot from the cat

im too going to be turboing my car, but thats not for a little while. i do have a harness all ready to go if i ever want to hook up the other O2

hope you find what your lookin for

quik sol

I have a B16....

OBD0 and OBD1 are one o2 sensor

OBD2 are two o2 sensors


Only reason for an OBD0 or OBD1 to have two o2 sensors is for a wideband.

ICeDoUt

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by quik sol &raquo;</TD></TR><TR><TD CLASS="quote">I have a B16....

OBD0 and OBD1 are one o2 sensor

</TD></TR></TABLE>

My car stock came with 2 o2 sensors.

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by mrx &raquo;</TD></TR><TR><TD CLASS="quote">You are wrong, the OBD0 B16A Engine needs two o2 sensors. i have the same problem as well.

my current sollution is to connect the two o2 sensor lines to one o2 sensor. so you have a not so perfect closed loop but it is good enough to drive and you don't throw the cel.

if you want a perfect sollutoin for the b16 then you need two o2 holes in the manifold befor the turbo like the original manifold has.

PS: If he has an cel for the o2 sensor, vtec will be disabled, so this is not unimportant

Greets
Malte.</TD></TR></TABLE>

Well i have a vafc, so even if i throw a code, my vafc will still let me go into vtec. but how did u manage to run all the wires into one sensor?

nsxmatt

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by quik sol &raquo;</TD></TR><TR><TD CLASS="quote">I have a B16....

OBD0 and OBD1 are one o2 sensor

</TD></TR></TABLE>

Jesus people, the obd0 1st gen B16 had two one wire o2 sensors from the factory. What these people are saying is you can get by with just one of them.

mrx

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by nsxmatt &raquo;</TD></TR><TR><TD CLASS="quote">Jesus people, the obd0 1st gen B16 had two one wire o2 sensors from the factory. What these people are saying is you can get by with just one of them.</TD></TR></TABLE>

Thanks matt ;-)

there was only ONE version of the B16 with the PW0 ECU that has 2 o2 sensors from stock... ALL others (excluding later OBD2 Cars) has only one sensor... thats fact!

But i have a question to crx2fast, what type of ECU are you running?

Thanks
Malte.

ICeDoUt

so should i loop them into one or just not even use the one O2 sensor? leave it unpluged?

mrx

No,

you have to connect one o2 sensor into both inputs on the ecu. I connected one o2 sensor like it is stock and connected the cable from this sensor to the other cable from the second sensor (which is not mounted) at the ECU wire harness. thats the best way i think if you want to use the pw0 ecu.

ICeDoUt

what about the pr3 ecu, same thing?

mrx

i think the pr3 has also 2 sensors but i'am not 100% sure.

honda9369

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by mrx &raquo;</TD></TR><TR><TD CLASS="quote">You are wrong

PS: If he has an cel for the o2 sensor, vtec will be disabled, so this is not unimportant

Greets
Malte.</TD></TR></TABLE>
so explain to me how the vtec will be disabled.

mrx

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by honda9369 &raquo;</TD></TR><TR><TD CLASS="quote">so explain to me how the vtec will be disabled.</TD></TR></TABLE>

thats simple, if the ecu throws an error so that the cel goes on, all not important functions will be disabled by the ecu itself to prevent any damage to the engine.

and therefor vtec will not engage if a oxygen sensor error was generated by the ecu.

its a safety function from the ecu.

raene

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by mrx &raquo;</TD></TR><TR><TD CLASS="quote">Thanks matt ;-)

there was only ONE version of the B16 with the PW0 ECU that has 2 o2 sensors from stock... ALL others (excluding later OBD2 Cars) has only one sensor... thats fact!</TD></TR></TABLE>

This is also wrong... my brother's B16 came from a front clip from Japan with a 5-thousand series and two O2 sensors. We saw the thing in the car. My PR3 also used two oxygen sensors, when I used to run it. In fact my car still has both one-wire O2's in it.

It's a bad idea to connect the two O2's together. Do some searching, you'll see why pretty fast. The second O2 should be at an identical distance in the second set of cylinders from the first, a foot or so from the head with the PR3/PW0 ECUs.

Plus, an O2 sensor code won't disable VTEC with those ECUs. I used to run with them unplugged for quite a long time (~2 months).

ICeDoUt

alright i know my car has 2 o2's, and again this will be for a turbo application, and i thought that u put the o2's after the turbo...... And i guess i am wondering waht ever other b16 turbo guy is doing for their setups for obd0, are you running both sensors? how good does it run and so on.....

mrx

i can only say what my ecu does. if i disconnect my o2, then my vtec doesn't engange any more.

The B16 first gen is the only engine honda produce with 2 o2 sensors... no metter what kind of ecu. pw0/pr3 the difference is the b16a2 with the p30 (obd1) and following.

we all know about the problem with the o2 sensors and the closed loop (hondata faq) BUT if anyone can tell me what else you can do without putting the o2 sensors in front of the turbo in the manifold then let me know.

i personaly had never seen a turbo manifold with two o2 sensor plugs... so you will get a problem.

you have only two choises:

connect both into one (as described)
or change the ecu (go to p30 or pm7 i.e.)

oh, there is also a third choise, you can run openloop ;-) but thats not a real one.

Greets
Malte.