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Thread: NGK WB - O2 placement

  1. #1

    NGK WB - O2 placement

    before I get bashed - there is no way I can put another bung pre cat in the car.

    The car is an 04 GTO with JBA shorties on it. Have a JBA mid pipe with high flow cats ready to go in again (long story - but painful). Anyone who has worked on these cars will tell you there is no room to work in the pre cat area with a shortie or stock exhaust manifold, a sadist must have put all of the braces in the way. Believe me I have the scars to prove it from the first go around.

    Now since I am keeping the shorties & cats in, does it even make sense to weld a bung post cat or will the readings be so far off as to be a useless exercise of even mmounting the WB?

    If I can go post cat - rough idea as to % I will be off? I have done a few searches and still can't figure out how far out the post WB AFR will be.

    I know - not optimum - but just trying to make the best of the hand I am dealt.

    Steve
    2004 GTO A4

    Add in a 2008 G8 GT and a 2009 G8 GT

  2. #2
    Senior Tuner Russ K's Avatar
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    I install the WB in place of the stock front O2 sensor when tuning.

    Russ Kemp

  3. #3
    Russ - do you then just put the car in Open loop mode until you pull it out?

    I maybe be able to get my hands on the passenger side pre cat o2 from the engine bay (Not real sure - no way to get to it from below without pulling the mid pipe out) to put it in.

    Thanks

    Steve
    2004 GTO A4

    Add in a 2008 G8 GT and a 2009 G8 GT

  4. #4
    Senior Tuner Russ K's Avatar
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    Dec 2005
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    The car will be in open loop with the stock front O2 sensor removed.

    Russ Kemp

  5. #5
    Senior Tuner
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    For GTOs, you can access the driver's pre-cat side O2 sensor from underneath the car, you can access the passenger's side pre-cat O2 sensor from the engine bay. You never want to leave the vehicle in closed loop when tuning with a wideband, as it will skew the tuning results.

  6. #6
    Quote Originally Posted by 12secSS
    For GTOs, you can access the driver's pre-cat side O2 sensor from underneath the car, you can access the passenger's side pre-cat O2 sensor from the engine bay. You never want to leave the vehicle in closed loop when tuning with a wideband, as it will skew the tuning results.
    Thanks on the Closed Loop info.

    The passenger side O2 - I agree - just a little contortionist required (probably just need the proper tools such as a nice long angled box wrench). The drivers side - maybe if you have a lot smaller hands then mine - man that place is tight.

    I will give the passenger side a try next weekend.

    Steve
    2004 GTO A4

    Add in a 2008 G8 GT and a 2009 G8 GT