I'm getting jdm 4-1 headers tonight.I was wonderign should I":

-convert it so I'll be running one o2 sensor and extend the wire all the way back to the end of the headers to where the cat is.

-plug up the o2 housing at the end of the headers, drill 2 holes to the headers, one on the far left and the one next to it on the right. Then weld the o2 nut to be able to bolt up the 2 o2 sensors.

help please.

-alex


Modified by mysiqu at 12:11 AM 6/29/2003

 

bump

 

dont run any o2 sensors. they are overrated. and FYI my tuned car with skunk2 stage1, JDM 4-1 intake and chip with VAFC and FPR just made 285 miles to a tank with no o2's! first try running both wires together, and if it hesitates, unplug the o2.

 

You should always run both primary and secondary O2 sensors. And you should never merge the primary wire with the secondary wire. If you do this then your car will hesitate. Go to http://www.hondata.com

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by mysiqu &raquo;</TD></TR><TR><TD CLASS="quote"> plug up the o2 housing at the end of the headers, drill 2 holes to the headers, one on the far left and the one next to it on the right. Then weld the o2 nut to be able to bolt up the 2 o2 sensors.
Modified by mysiqu at 12:11 AM 6/29/2003</TD></TR></TABLE>

Yep thats the best way, to plug up the one hole. Just take a spark plug and stick it in there. It should fit perfect.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by johnzm &raquo;</TD></TR><TR><TD CLASS="quote">dont run any o2 sensors. they are overrated. and FYI my tuned car with skunk2 stage1, JDM 4-1 intake and chip with VAFC and FPR just made 285 miles to a tank with no o2's! first try running both wires together, and if it hesitates, unplug the o2. </TD></TR></TABLE>

thats just redicoulous.. ive never seen a car run "ok" without O2's.. full throtle, the system goes into a open loop, and nothing real matters then, but around town, it will bog, and run like crap..

Honda didn't add 2 seperate O2's for no apparent reason... they do things.. things for the ECU to know how the engine is running.

90 Blk CRX bought some DC 4-1's i converted.. and i think they're doing ok for him.. i used them in my beast.. and i welded the O2 bungs pretty close to OEM specs.. worked for me.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Built B16A &raquo;</TD></TR><TR><TD CLASS="quote">90 Blk CRX bought some DC 4-1's i converted.. and i think they're doing ok for him.. i used them in my beast.. and i welded the O2 bungs pretty close to OEM specs.. worked for me.</TD></TR></TABLE>

Yep, never had a problem with it at all. I had to rewire the one o2 sensor cause it would not reach but I never ran in to a problem with the actually o2 sensors working.

 

convert to obd1

 

I dont run an O2. I just use it on the street for my air fuel gauge. On the track I pull me exh and o2, runs fine. chiped pr3

 

yeah.. well thats on a chipped ECU.. i think we're talking about a stock set up. yeah, i know the Mugen chip went to 1 O2, and got rid of VTEC oil press, and the knock sensor.. some of the other programs really take out alot of funtions. however, i had a custom computer made for me.. basicly, no RPM, 6K VTEC, and stock timming and fuel. the Mugen, Spoon, Fields, all of them drasticly advanced the timming, and fuel. My car barley ran on the Mugen chip.. barley idle. it was shitty.

stock computers need stock components.. PR3 and PW0 UNCHIPPED needs both O2's. For that matter, even the PR4, USDM 90-93 Integra.

 

the stock ECU runs fine without O2's/ at least mine did before i chipped it. if you dont believe me please, come down and ill take your for a ride

 

there is no way a stock engine, being a GSR, ITR, B16.. LS.. all of them NEED O2's... Honda didn't add those pricey sensors for no apparent reason.. they read the exhaust vapors, and send the readings to the ECU.. there it adjusts fuels, and timming to make the engine run the best to its ability. Now.. a chipped ECU.. takes alot "streetabiltiy" out of it.. chipped computers are made for race applications, being it, N20.. Turbo.. all motor apps.. stock... is for around town reliability, and not to mention MPG. Trust me.. Honda didnt' make O2's for you to take them off.. so you can brag on Honda Tech.. i swear it runs great! lol

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Built B16A &raquo;</TD></TR><TR><TD CLASS="quote">there is no way a stock engine, being a GSR, ITR, B16.. LS.. all of them NEED O2's... Honda didn't add those pricey sensors for no apparent reason.. they read the exhaust vapors, and send the readings to the ECU.. there it adjusts fuels, and timming to make the engine run the best to its ability. Now.. a chipped ECU.. takes alot "streetabiltiy" out of it.. chipped computers are made for race applications, being it, N20.. Turbo.. all motor apps.. stock... is for around town reliability, and not to mention MPG. Trust me.. Honda didnt' make O2's for you to take them off.. so you can brag on Honda Tech.. i swear it runs great! lol</TD></TR></TABLE>

sorry the ecu has nowhere close the accuracy to tune my car for great driveability with cams and everything else ive done. O2's are nothing but a nuisance to me and my tune, since they are always ativley tuning the ECU for part throttle driveability. a dyno is a much better place to setup fuel maps, dont you think?

 

sorry if im so against putting o2's in the primaries of a brand new header. i woudl assume they create a great deal of turbelence and are the cause for alot of HP loss. not to mention being ugly as crap on my polished SS 4-1

 

the cat that started this post.. wanted to know about some headers.. and the issue wiht O2's.. since.. there IS a issue about the O2s. Ahhh, and more than likley, he has a stock ECU, and more than likely, not a whole lot of bolt ons.. (cams).. so.. for him.. a baiscly stock setup.. mildley tuned.. i belive the O2's and stock computer tunning is important..

on the other hand.. you, wiht your cams, intake, exh, chipped computer.. prolly fuel delivery.. alot of other crap.. i can understand where your comming from.. O2's will prolly not make alot of sence... or do much good.. but i still can't understand how you can say they dont' do ****. Even the P28, and P72's have O2's.. if all the chipped computers have pins on the ECU for O2's.. and they dont' do any good.. why have them? You don't think "True racers" know? Yeah, your 8 and 9 second cars dont' have them.. and then.. they're all redline all the time anyways.. but they're 90% throttle on the track, all the time.. O2's aren't going to do any good open loop.

guys.. trust me.. Honda didn't make O2's for no reason.

 

and, i know where your comming from, on welding crap on your shinney headers.. i didnt' want to do mine at 1st... but i hated boggin around town, cuz my O2's were fucked.. but i added mine, exactly where the OEM ones are.. and used some bitchin heat wrap. i think they looked sick.. Black 90 Si has them right now.. maybe one day he'll break down, and get some pics? lol

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Built B16A &raquo;</TD></TR><TR><TD CLASS="quote">and, i know where your comming from, on welding crap on your shinney headers.. i didnt' want to do mine at 1st... but i hated boggin around town, cuz my O2's were fucked.. but i added mine, exactly where the OEM ones are.. and used some bitchin heat wrap. i think they looked sick.. Black 90 Si has them right now.. maybe one day he'll break down, and get some pics? lol </TD></TR></TABLE>

And I'm so glad you did welded the bungs in so I did not have to take care of it, if I ever get a hold of a digital camera I will take pics, although the header wrap is off now.

 

any one got pictures?

 

[QUOTE=Built B16A]the cat that started this post.. wanted to know about some headers.. and the issue wiht O2's.. since.. there IS a issue about the O2s. Ahhh, and more than likley, he has a stock ECU, and more than likely, not a whole lot of bolt ons.. (cams).. so.. for him.. a baiscly stock setup.. mildley tuned.. i belive the O2's and stock computer tunning is important..




back to topic please..(thanks)

 

mysiqu, when i get home tonight, i'll try and dig up some pics of those headers, i know i have them, i'll get them uploaded, and linked. Pretty nice welds for a driveway mechanic if i say so myself.

 

pics please!

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Built B16A &raquo;</TD></TR><TR><TD CLASS="quote">the cat that started this post.. wanted to know about some headers.. and the issue wiht O2's.. since.. there IS a issue about the O2s. Ahhh, and more than likley, he has a stock ECU, and more than likely, not a whole lot of bolt ons.. (cams).. so.. for him.. a baiscly stock setup.. mildley tuned.. i belive the O2's and stock computer tunning is important..

on the other hand.. you, wiht your cams, intake, exh, chipped computer.. prolly fuel delivery.. alot of other crap.. i can understand where your comming from.. O2's will prolly not make alot of sence... or do much good.. but i still can't understand how you can say they dont' do ****. Even the P28, and P72's have O2's.. if all the chipped computers have pins on the ECU for O2's.. and they dont' do any good.. why have them? You don't think "True racers" know? Yeah, your 8 and 9 second cars dont' have them.. and then.. they're all redline all the time anyways.. but they're 90% throttle on the track, all the time.. O2's aren't going to do any good open loop.

guys.. trust me.. Honda didn't make O2's for no reason. </TD></TR></TABLE>

I strongly 2nd this. Totally agree.

 

you know, i don't understand, i have a 2nd Gen B16, custom chipped computer, stage 3 cams.. every bolt on imaginable, and i still can't drive around town with out the throttle being jumpy unless i floor it.

yeah, tunning a really modified engine gets harder and harder the more you get into it.. but O2's are an essincial part of the powerplant.

i can't see at all, how you can say the O2's on your car dont do anything? i can tell on mine, i REV 9500 RPM, VTEC at 6, and 100 shot, i need my O2's! lol

 

another thing.. have you seen alot of posts around? "Bogs at 3K rpm?" or.. jumpy throtle? and everyones responces are, maybe you have bad O2's, or have them switched? its an issue.. if it runs ok on your car for you, more power to you.. but for the most part.. you need them.

 

I agree with BuiltB16A. I had tried both running one O2 and no O2 sensors. Both ran only ok at best.
I finally drilled the holes into the primary tubes on the header and ran two o2 sensors and immediatly noticed the throttle response was better.
If I lost any power at all with the O2 sensors in the tubes, I more than made up for it in driveability.