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  1. #1

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    do i need o2 sensor?

    i have a 2005 rxp with upgraded valves and retainers an et127 wheel and 48# injectors. i would like to get the vtech maptuner while its on sale but do not plan on getting the data logger yet. also want to stick with my stock rev limiter for now. my question is do i need to get an o2 sensor and gauge(i already have an o2 bung welded in the j pipe from previous owner but it just has a plug in it right now) to run safely and reliably once its tuned . im just trying to save a little money right now and dont want to pay 200 for a gauge if i dont need it yet


  2. #2
    boost junkie skidoochris's Avatar
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    with the logger you do not need gages
    you just look at your phone or the log

  3. #3

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    no i mean is it ok to go with out either one for a while

  4. #4
    h2jim's Avatar
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    48's with a 127 will make you very rich.

  5. #5

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    I went with the 48s because it was recommended for use with the et 127 on a factory tune. I still have my 42s and will probably switch back when I get the vtec

  6. #6
    AtoMIC_OraNGE greenbullet's Avatar
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    42 lb is what you need with the 127 deffently not 48s on an 8100 limit

  7. #7
    SLASHER's Avatar
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    Go 48s with V tech tune ... Much nicer set up ...

  8. #8
    boost junkie skidoochris's Avatar
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    the 05 ecu does not like boost above 11psi

  9. #9

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    Sorry I had to check my receipts I do have the 42# injectors with my 127. I would like to get the vtech but I can't afford to get it and the data logger. So I'm asking if it is safe to get the vtec with tune for stock rev limit and not need the O2 sensor and gauge yet

  10. #10
    AtoMIC_OraNGE greenbullet's Avatar
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    42 and 127 wheel you will be fine AFR wise with stock ecu .. very safe ive set up a few skis with this setup .. no o2 needed ...its a proven safe setup and every ski ive setup the afr have been good idle 11.9 mids in 13s and wot like 11.9 -12.2 afr
    ive installed j pipe and gauge and tested and everytime AFR are all within range if anything a little rich at idle but a stock IC was still being used.

    A vtech flash will be a higher rev limit... more injector needed like 48s and now you will need to monitor AFR

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