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  1. #1 Knock retard 
    GTPJIM
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    Default 08-25-2015
    I finally had the courage today to drop down pulley sizes from a 3.6 to a 3.4 on my GTP which currently has an Overkill Tune, Autolite 104, Plog, 3" Downpipe, U Bend Delete, Magnaflow Catback, 180* T-Stat and KN CAI.
    I was seeing 3* of KR at only 40% boost, should I go back to a 3.6 pulley for now or is this an acceptable limit?
    2002 - GTP, KN-CAI, Autolite 104, Magnaflow CatBack, ZZP 3" DP, ZZP-Plog, Overkill Tune, ZZP MPS 3.6" pulley, Don Rome STB, Mobil 1 Syn, Transgo Shift Kit, Flipped Dogs.
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  2. #2 Re: Knock retard 
    sseilmnop
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    Default 08-25-2015
    Go back. it will have more power without KR
    Adapters, Phenolic Intercoolers, Supercharger Parts & TVS2300
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  3. #3 Re: Knock retard 
    Slick2500
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    Default 08-25-2015
    Once you start modding any KR is bad.
    2003 Redfire Metallic Chevy Tahoe Z71 - Airaid Modular Intake Tube, Flowmaster Exhaust.
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    Superchargers take away horsepower
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  4. #4 Re: Knock retard 
    coolone
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    Default 08-26-2015
    And your Overkill tune was programmed for a 3.4"?
    Overkill BBC Cam, YT 1.8 RR's, Rhodes Lifters, STGII Heads, GenV, Pacesetters, 3" Exh to Tips, TEP Trans. N*, ID 75# injectors/E85 coming soon
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  5. #5 Re: Knock retard 
    EHB
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    Default 08-26-2015
    are you using 93 octane ? what are your plugs gaped at ? were you seeing any kr with the 3.6 pulley ?
    Last edited by EHB; 08-26-2015 at 08:18 PM.
    2000 GTP - 3" Catted DP...ZZP Plog...9" Cone filter...Reptile pcm...3.4 pulley...AL104's
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