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plugs 3923 or 3924's

Discussion in 'Newbie and Basic Turbo Tech Forum' started by rudder9, Oct 2, 2013.

  1. rudder9

    Joined:
    Sep 13, 2013
    Quick rundown. Afr 185 heads 383sbf, 9.29:1 compression. Running max of 14.8 psi through a 76mm.I have 3923's in it now.Just wondering if I could go up a heat range. Tuning done with a fast and only seeing 15* timing up top on 93 octane.Idle a/f is 14.3 ish but plugs I took out after tuning looked pretty sooted up.Target a/f under boost is 11.5.Or is there a better choice of plugs.
     
    rudder9, Oct 2, 2013
    #1

  2. turboeverything

    Joined:
    Mar 20, 2012
    With my old set up that was damn near exactly like what you have. I ran 3923 with 25 psi.
    Ran up to 18psi with the 3924.
    My set up was about 8.5-1 compression though.
     
    turboeverything, Oct 30, 2013
    #2

  3. spoolinranger

    Joined:
    Jan 21, 2007
    I ran the 24s on 15lbs and pump gas, now using a ngk 9 that is suppose to be a better plug
     
    spoolinranger, Oct 31, 2013
    #3

  4. Gen1SVE

    Joined:
    Sep 13, 2006
    NGK R5671A-9
     
    Gen1SVE, Oct 31, 2013
    #4
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