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Re: turbocharging a 472 caddy

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  • david brode
    legayerabydavis, The taller tires make your effective ratio taller as well, not deeper. 29/28 = 1.0357. So, 3.57% taller tires give you an effective 3.59-1
    Message 1 of 2 , Nov 27, 2003
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      legayerabydavis,

      The taller tires make your "effective" ratio taller as well,
      not deeper. 29/28 = 1.0357. So, 3.57% taller tires give
      you an effective 3.59-1 ratio. [3.73 minus 3.57% = 3.596]

      Even if I'm wrong about the 3.33-1s, and 3.54-1s are the
      tallest gear that you can find, that'll give you another
      5.36% reduction in rpm at any given speed. Your "effective"
      ratio with 3.54-1s would be then 3.41-1.

      Ignoring your 1" taller tires, a .73-1 overdrive would make
      the normal 3.54-1s act like 2.58-1s, and it would make 3.73s
      act like 2.72s [2.48-1 and 2.62 effective when you add the inch
      for the tires]

      Damn, that's a tall overdrive gear in that trans. I don't
      think that I've seen a trans with that much overdrive ratio.
      Assuming that third is 1-1, it might not be a bad combo. 3rd
      gear for steep hills, and od for the flat. A stick flywheel
      for the Caddy is like $300 bucks though, and that's assuming
      the 833 trans will work with a GM bellhousing.
      Dave



      56" <legayerabydavis56@y...> wrote:
      > the reason i have 3.85 gears is my 3.73s origanaly had 28 inch
      tires
      > but they were stupid 16.5s i switched to 16s they are 29 inches
      tall
      > i didnt think the caddy rear axle would work but i had to ask i
      have
      > another option if i can find a bellhousing from a pontiac or buick
      > then i can use my 833 manual trans it has three forward and .73
      > overdrivethat makes my 3.86 gears 2.81 gears i would rather use the
      > manual trans they are much easier for me to work on the only reason
      i
      > swapped motors is i didnt want to pay 7500.00 for a 390 that wont
      > make the same hp or torque as the 472
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