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Thread: yet another tune qustion

  1. #1
    Join Date
    Jan 2009
    Location
    Rhode Island
    Posts
    241

    yet another tune qustion

    if have a tune and it is set for like a 285/75r16 size tire and were to put a 30 or 28 inch tire on the truck would it mess with the way the truck runs,shifts?
    06 GMC 2500HD EC/SB 6.6 LBZ allison 6 speed, 4" MPRP turbo back, QS2 on the 70HP tune
    2000 chevy2500 RCLB 6.0
    4L80E,4.10s,aem intake,180 t stat,ported tb,descreened maf, true duals with high flow cats and 40s dumped, lt285/75r16 MTs,an a hypertech programer for now saving for a custom tune now its dead
    15.9 at 88 with mudd tires
    1973 chevy k10
    1989 chevy k1500 stepside

  2. #2
    Join Date
    Nov 2007
    Location
    Pittsburgh, PA
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    3,581
    yes, shifts will be off since your dropping almost 3 to 5 inches of tire size. speedo will be way off as well
    2002 Lightning - GT headed 5.5Litre w/ Twin 7665s
    2002 Silverado - 427Lsx w/ Twin gt4202s
    2010 Silverado crewcab Z71 - 5.3litre w/ procharger
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    412 Motorsports

    it ain't that I'm too big to listen to the rumors, It's just that I'm too damn big to pay attention to 'em..That's the difference

  3. #3
    Join Date
    Jan 2009
    Location
    Rhode Island
    Posts
    241
    know of any street tires that are around that size that would be good at the track
    06 GMC 2500HD EC/SB 6.6 LBZ allison 6 speed, 4" MPRP turbo back, QS2 on the 70HP tune
    2000 chevy2500 RCLB 6.0
    4L80E,4.10s,aem intake,180 t stat,ported tb,descreened maf, true duals with high flow cats and 40s dumped, lt285/75r16 MTs,an a hypertech programer for now saving for a custom tune now its dead
    15.9 at 88 with mudd tires
    1973 chevy k10
    1989 chevy k1500 stepside

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