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  1. #1
    Join Date
    Dec 2004
    Location
    Greeley, Colorado
    Posts
    485

    Default Turbocharger selection

    I'm meeting with my fabricator this weekend to talk about how we are going to plumb the system on this car. I'm still struggling on turbo selection however.

    I'm not sure if we are going to have room to go with twins because of drivers side. The brake power booster, power steering lines and upper control arms will likely interfere with the exhaust plumbing. I don't for see a problem plumbing from the heads to the turbo, but room for the downpipe would be extreamly short.

    With that said I may end up going with a big single. It's nearly impossible to kill the low-end on a 455 so I'm not worried about loosing low-end on a big single application. My problem is still in sizing. I'm looking to push between 650-700 which should be about the limit on pump gas with this size motor.

    What turbo would you guys recommend for both a twin application and a single. My RPM range is 2000-6000 on the motor build. I would like to reach full boost no later than 3500 rpm. My stall speed is 2800-3000 on the tranny, so full boost closest to these rpms speeds would be ideal.

    thanks in advance.

    Jason Mounce
    1969 Firebird | 2008 Corvette Z06 | 2008 Mustang GT/CS


  2. #2
    Join Date
    Nov 2004
    Location
    NW Arkansas
    Posts
    1,743

    Default

    As far as I know Turbo sizing is very very important and those decisions I tend to leave to the professionals! I would call GARRETT or turbonetics or whoever you plan on buying a turbo from! I am like you I think twins can get very cluttered in a smaller engine compartment or when other componets get in the way!
    KENNY DAVIS HOTRODS

  3. #3
    Join Date
    Apr 2001
    Location
    The Druid City
    Posts
    14,247
    Country Flag: United States

    Default

    Will this be on pump gas?

    Andrew
    1970 GTO Version 2.0
    1967 Cougar build
    GM High-Tech Performance feature
    My YouTube Channel Please Subscribe!
    Instagram @projectgattago

    "You were the gun, your voice was the trigger, your bravery was the barrel, your eyes were the bullets." ~ Her

  4. #4
    Join Date
    Aug 2004
    Location
    Alta Loma,SoCal
    Posts
    396

    Default

    A single T76 should make that horsepower easily, or even a t88 at lower boost levels for less heating of the air. For twins, a couple t61's will make way more than want, but will still spool up quickly.
    Dont get caught up in the "twins spool up faster than a single" thing. Cause it aint so if you size correctly.
    Use a .96 a/r turbine on the single, and some .81's or even .68's on the twins.
    1965 Buick Skylark

  5. #5
    Join Date
    Dec 2004
    Location
    Greeley, Colorado
    Posts
    485

    Default

    Yes the car will be on pump gas. Also keep in mind I'm in Colorado, our air is QUITE a bit thinner up at this alititude.

    TurboLark, I was originally looking at a t70. to small for this application? What about a GT 42?
    Jason Mounce
    1969 Firebird | 2008 Corvette Z06 | 2008 Mustang GT/CS

  6. #6
    Join Date
    Apr 2001
    Location
    The Druid City
    Posts
    14,247
    Country Flag: United States

    Default

    1970 GTO Version 2.0
    1967 Cougar build
    GM High-Tech Performance feature
    My YouTube Channel Please Subscribe!
    Instagram @projectgattago

    "You were the gun, your voice was the trigger, your bravery was the barrel, your eyes were the bullets." ~ Her

  7. #7
    Join Date
    Dec 2004
    Location
    Greeley, Colorado
    Posts
    485

    Default

    Thanks for the link Andrew, that was exactly the information I was looking for. I know the heads that I'm going to be using, and the amount of air they flow. Given I know this amount as well as the size of the engine, how would I go about compiling a flow chart for the engine. If I can come up with that I can choose the turbo I need pretty easily.
    Jason Mounce
    1969 Firebird | 2008 Corvette Z06 | 2008 Mustang GT/CS

  8. #8
    Join Date
    Apr 2001
    Location
    Boston, MA
    Posts
    709

    Default

    ~Ryan



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