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  1. #1
    SHOBiz's Avatar
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    FZ/SHO Spark Plug Thread

    Which plugs and or heat range are you using with what level of modifications?

    What results or improvements did this provide and also how long are the plugs lasting?


  2. #2
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    Plugs

    Well as far as boost for every couple more lbs of boost u should drop 1 on the heat range to a colder plug guess it depends on how many lbs of boost u are running?

  3. #3
    desperado's Avatar
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    I'm running NGK R7437-9 iridium racing plugs. Heat range is 9 which is 1 step from the coldest available from NGK. No plug fouling so far, but I have setup my cold start fuel calibration a little leaner to avoid fouling these cold (and expensive) plugs.

  4. #4
    SHOBiz's Avatar
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    Quote Originally Posted by desperado View Post
    I'm running NGK R7437-9 iridium racing plugs. Heat range is 9 which is 1 step from the coldest available from NGK. No plug fouling so far, but I have setup my cold start fuel calibration a little leaner to avoid fouling these cold (and expensive) plugs.


    At least I am not the only one paying for those. I have the 8's though.

  5. #5
    gordon lasiter #328's Avatar
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    Quote Originally Posted by desperado View Post
    I'm running NGK R7437-9 iridium racing plugs. Heat range is 9 which is 1 step from the coldest available from NGK. No plug fouling so far, but I have setup my cold start fuel calibration a little leaner to avoid fouling these cold (and expensive) plugs.
    at what boost should you not use the oem plugs?
    i am still using the oem plugs with a c3 wheel with the R2 reprogramming.
    and would colder plugs affect your afr?

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