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Understanding Turbos

Discussion in 'Forced Induction' started by endlesszeal, Sep 17, 2003.

  1. endlesszeal

    endlesszeal Senior Member

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    Nov 13, 2002
    i just recently learned how to read compressor maps and how to roughly plot your engines specs into and see where it lands if its in its most efficient part.... now i want to know how to tell how much boost this turbo can handle, whats its power band, etc... by just looking at numbers.. for example:

    -Wheel- 48/52/56 Trims -
    49.3/51.2/53.1 inducers / 71.1 Major
    -Housing- 70 Inlet / 50 Outlet - 0.50 A/R
    -Wheel- 84 Trim - 56.5 Major / 51.8 Exducer
    -Housing- GT25 inlet / Outlet spec:
    Internal GT28; 0.64, 0.86 A/R
    External GT30; 0.61, 0.73, 0.87, 1.01, 1.12 A/R

    what does that all mean???? i want to learn how to pick a turbo instead of go, oh i want a T3/T4 because ummm thats what everyone uses.. anyway, thanks in advance..
  2. pissedoffsol

    pissedoffsol RETIRED

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    Sep 28, 2002
    Retirement Home
    the thing is, there's 231412312321 t3/t4 turbos out there.

    there's several trims for the compressor, there's several trims for the turbine.
    there's countless a/r's for both
    there's countless wheels
    there's countless housings.

    inducers and exducers are effected by the a/r and so much more...

    it would take years for me to begin to type this stuff up.
    here's some links.

    what is a/r? http://www.honda-tech.com/zerothread?id=153810
    a bunch of great links on general setups: http://www.honda-tech.com/zerothread?id=268110

    moreover, i highly suggest you pick up a book on turbos- Corky Bell's Maxium Boost. Amazon has it for like $25
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