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    Results 1 to 4 of 4
    1. #1
      Join Date
      Dec 2011
      Location
      new york
      Posts
      295
      Country Flag: United States

      Forced induction and compression ratio

      How do you figure out what compression to run with a power adder? Now that winter is moving in on us, it's time to take a good running complete car and tear it apart. I want to build a reliable l76 turbo engine. Not looking to make all of the power, but looking for another 200-250 who more. Planning on doing rods and pistons with hooker turbo manifolds.



    2. #2
      Join Date
      Mar 2020
      Posts
      120
      With EFI, 9.5:1 is a reasonable compression ratio. You can reliably get to approx 550rwhp on pump fuel on a LS1/2 before you get into rod/piston reliability issues.
      Upgrade pistons/rods & you can make 8-900 wheel on pump fuel.

      If you use E85, then 10:1 or higher will net more power.

      At 9:1 & lower you sacrifice significant part throttle torque, but can make up for the the power loss with more boost but at the loss of cruise drive-ability/throttle response.
      I stick with 9.5:1 or higher.

    3. #3
      Join Date
      Dec 2011
      Location
      new york
      Posts
      295
      Country Flag: United States
      Thank you

    4. #4
      Join Date
      Aug 2004
      Location
      Red Deer, Alberta, Canada
      Posts
      1,309
      Country Flag: Canada
      9.5-9.8:1 on pump fuel including e85( I say this because its not pump gas in every region).

      Keep the turbo setup intercooled regardless of fuel.
      Matt
      72 Chevelle 370ci LS Turbo. Speedtech equipped.
      Instagram: Cst_koon