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small vs Large turbo at 8 psi

Discussion in 'Forced Induction' started by whinybitch, Nov 25, 2010.

  1. whinybitch

    whinybitch .

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    .
     
    Last edited: Apr 16, 2012
  2. Briansol

    Briansol Admins Admin VIP

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    psi is pressure. it's not a measurement of air flow. that's cfm.

    a larger turbo,a ssuming it's in it's efficiency range, will make more cfm at X psi than a smaller turbo.


    psi should NEVER be a goal, but rather the number required to reach said goal.

    It depends on your motor, the build, the tuning, the type of driving you want to do, the effeceny range of the turbo, etc etc to size one correctly.
     
  3. K2e2vin

    K2e2vin Senior Member

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    Depends on what you define as "large". I'm not sure if anyone came up with a online turbo sizing calculator but for the intended pressure and engine size/efficiency, you can calculate the necessary flow and plot optimal points on a turbo map. You don't want to go too small or too large, but have it just right.

    In general, a turbo too big would lag a little longer while a turbo too small would have trouble maintaining peak boost/efficiency at higher revs. With a goal of 190hp, a "small turbo" should do the trick.
     
    Last edited: Nov 25, 2010
  4. intenseneal

    intenseneal New Member

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    Of a street driven DD with weekend track use a smal to mid sized turbo is best. I like the TDO5H turbo for a boosted DD t3/t4 is also a good choice. For a Drag track car a big turbo is better.
     
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