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B16A into '89 Rex--O2 sensor question

Discussion in 'HYBRID -> ED-EF / DA' started by Carl425, May 5, 2007.

  1. Carl425

    Carl425 New Member

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    I bought a 4 into 1 header off of eBay and though it appears to be a quality product, it only has one O2 bung in it located just behind the collector. I'm thinking it's
    designed for OBD1 but the motor is OBD0 so I need the second O2 sensor. My question is how where should I put the second sensor? My initial thought was to plug the bung that it came with and put in two new bungs, one in the #1 pipe and on in #4, will this work? There's no non-ghetto way of putting a bung in so that it measures two cylinders at once due to the design of the header. I"m not willing to swap to OBD1 (not just yet anyway) and I"m not buying a different header either. Anyone's thoughts?

    Carl425
     
  2. jason22ga

    jason22ga jason91si

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    i tried what your talking about it wont work your car will run like crap and vtec wont engage well at least mine didnt im using the stock jdm header that came with my swap until i convert to obd1
     
  3. TheManRSW

    TheManRSW TheManRSW

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    Good luck. If I am not mistaken that engine requires two o2 sensors 1 & 4...and 2 & 3 for it to run correctly. With a 4-1 header...that is going to be pretty tough. Your best bet would be to keep the stock jdm manifold.
     
  4. TheManRSW

    TheManRSW TheManRSW

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    I would stay with this manifold...it'll be pretty tough to make it work another way.
     

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  5. Carl425

    Carl425 New Member

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    I know, it uses a 1&2 and 3&4 setup normally, that's why I was figuring I could just put two bungs and then put them in different cylinders (1&4 or 2&3, shouldn't matter) and should get the same result. All the stock setup is doing is using an average of the 4 cylinders by means of averaging two at the same time but, it won't know the difference between being in a tube that is shared by two cylinders or being in two distinct separate cylinders. That's my theory anyway. As long as I'm using tow sensors and they're placed equal distances down the tubes, just like the JDM manifold, then it should work. Any more thoughts?
     
  6. TheManRSW

    TheManRSW TheManRSW

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    You can try. I have read numerous posts about people who have tried this...but the air fuel mixture will fluctuate rich to lean...due to cross counts of the o2's. I wouldn't try this, but I value a correct air/fuel mixture more than most.
     
  7. goldgreen90ef

    goldgreen90ef goldgeen90ef

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    i have the same problem, and im getting my ecu chipped to not look for 2 o2 sensors...
     
  8. Carl425

    Carl425 New Member

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    Where are you having that done? And how much?
     
  9. goldgreen90ef

    goldgreen90ef goldgeen90ef

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    obdo tuning

    i think its called zerolift autolab in cincinatti ohio..........
     
  10. Carl425

    Carl425 New Member

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    Yep, I checked with them and they said they can do this and that they will also do all the other things that most tuners do, more aggressive air/fuel map, bump the redline up, etc... for $150
     
  11. hondaman85

    hondaman85 Large Member

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    any where else close to columbus that will do that?
     
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