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Thread: extractors and o2 sensor changes

  1. #1
    Tuner in Training
    Join Date
    Jul 2017
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    15

    extractors and o2 sensor changes

    G'day lads

    Has anyone ever made o2 sensor related changes in their tune, after having extractors fitted? In particular with an na v8 (bf xr8)

    Since changing from factory manifolds to Pacemaker tri-y's and more recently, changing those to Hurricane 4 into 1's, I've had a "semi rough" idle and when codes come up, it's always p0133 and p0153 (circuit response slow). Bumping the desired idle rpm up to 650ish helps but I can still feel it isn't as smooth as it should be. I'm guessing the location of the bungs is considerably back from where the factory ones are, moreso with the hurricanes and am wondering if the computer needs a delay or bias adjustment for the o2's to suit?

    Other than the dodgy idle, performance seems fine. The car was tuned by a shop when the pacemeakers went in but I can see from comparison to a stock xr8 file, o2 stuff was not altered.

    Any advice much appreciated.

    Cheers

  2. #2
    Senior Tuner Russ K's Avatar
    Join Date
    Dec 2005
    Location
    Regina, Sask.
    Posts
    4,182
    Slow response codes are very common codes with long tube 4 into 1 headers. Just disable those codes.

    Russ Kemp

  3. #3
    Tuner in Training
    Join Date
    Jul 2017
    Posts
    15
    Hey Russ

    Thanks for that tip mate. I've since read some other threads on here in the GM section and see what you mean, it does seem very common.

    What is it that's causing the codes in your experience? Lack of temperature or velocity?