new 275 Khumos, or worn out 315's @ track? - FirebirdV6.com/CamaroV6.com Message Board

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  • new 275 Khumos, or worn out 315's @ track?

    I have 6 rims and tires:

    --->2 16X8 with new eagle GTII's

    --->2 17X9 with new Khumos ???

    --->2 17X11 with 315/35/17 sumitomos that are worn to the point that they fail state inspection.

    Im going to run the 16X8's in the front, but what about the rear????
    1999 White Ford SVT Lightning.<br /><br />Hoping to dyno @ 450hp/550tq by the end of \'04.

  • #2
    275 kumho's since they have tread and will grip more than the treadless 315's.
    2001 Arctic White Firebird<br />More mods than I\'m allowed to list!

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    • #3
      If you really that concerned about performance, stay with the 16's. 17's will kill your ET.
      <a href=\"http://pics.projectpredator.com/thumbnails.php?album=16\" target=\"_blank\">2003 Zinc Yellow Mustang GT</a> 1 of 701<br />ET : TBD<br />But our shenanigans are cheeky and fun! Yeah, and his shenanigans are cruel and tragic. Which... makes t

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      • #4
        Well he only has 2 16" wheels/tires. I would go with the khumos.
        <b>Black 1996 3.8L Firebird A4</b><br />--------------------------<br />Custom CAI, Flowmaster Dual Exhaust, 160 Deg Thermo, BMR ShockTower Brace<br />JVC mp3 HU, two 12\" Infinity Kappa Perfects, Infinity 6.5\" components, JBL 600.1 & 80.4 amps <br /><a href=\"http://community.webshots.com/album/479229363CPbPiz\" target=\"_blank\">Pics</a>

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        • #5
          Go with the treadless tires. Tread is BAD for traction on dry surfaces (I.E. tracks). The less tread there is, the more rubber there is to make contact with the ground. This is why autocross racers use almost bald tires to race on. This is also why slicks are better than drag radials.

          Also, 315 is a GREAT width for traction. And, 17" wheels will NOT effect performance unless they are not sized properly. If your speedometer is correct, then your performance is not effected.

          A 315 tire with no tread is a FANTASTIC racing tire. Period.
          All gone :(<br />Best ET ever: 14.3 (I think)<br />----------------------------<br />Check out my site for exhaust clips, burnouts, and pictures, and the supercharger throttle body mod.<br /><a href=\"http://www.geocities.com/net_addict/index.html\" target=\"_blank\">Click on the Firebird</a>

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          • #6
            I checked the calculations, and the 315/35-17's are a .1% difference than the stock tire siz. This means that mechanically, the 17" rims have ZERO effect on performance (well, .1% if you are a stickler for the numbers, but this is negligible when you factor in everything that has to do with racing).


            I have to say it again to make sure everybody knows- if you size your tires properly (like in this case), 17" rims will have no effect on your ET's.

            [ October 21, 2003: Message edited by: Riles ]</p>
            All gone :(<br />Best ET ever: 14.3 (I think)<br />----------------------------<br />Check out my site for exhaust clips, burnouts, and pictures, and the supercharger throttle body mod.<br /><a href=\"http://www.geocities.com/net_addict/index.html\" target=\"_blank\">Click on the Firebird</a>

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            • #7
              "I have to say it again to make sure everybody knows- if you size your tires properly (like in this case), 17" rims will have no effect on your ET's."

              One thing you're not considering. 17s will generally weigh more than 16s. You're replacing rubber with steel. See:

              http://www.bfranker.badz28.com/fbody/weights.htm

              You need to spin up that weight. It's tough to say exactly how much effect it will have. But I think a lot of drag guys like 15s for this reason.
              2000 Firebird convert, chameleon/tan, M5, Y87, TCS, BMR tower brace and panhard, KBDD sfcs, 245/50-16 GSCs

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