How do you measure a turbo size?

Posted by AWD1gTalon, Mar 18, 2004
Newbie Forum - Beginner/newbie/general DSM modification questions. First mods, how to run 10's when you haven't run 12's yet, any tech question that doesn't fit in another tech forum.

  1. AWD1gTalon

    AWD1gTalon Probationary Member

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    Danbury, Connecticut
    I'm interested to know how a turbo size is measured. When people talk about trim size, what is that standing for or what wheel is measured. An example, a 50 trim. where does that number come from, which wheel is measured and would it be exactly 50mm? And how does each wheel affect flow and performance.
    Thanks.
    #1
  2. Iceman

    Iceman Proven Member

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    Minnesota, Minnesota
    50trim means the wheel it uses.
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  3. L2RTSiAWD

    L2RTSiAWD Moderator

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    More specifically, the Compressor wheel.
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  4. AWD1gTalon

    AWD1gTalon Probationary Member

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    so by measuring the compressor wheel i'll get say 50mm is there a taper on the wheel or anything where it would affect a person measuring it or is 50 all the way down. thanks, this is just something i've been wondering.
    #4
  5. kpt4321

    kpt4321 Proven Member

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    Trim is a ratio of the exducer diamter and the inducer diameter. Trim is equal to the square of the inducer diameter divided by the exducer diameter.
    #5
  6. AWD1gTalon

    AWD1gTalon Probationary Member

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    Danbury, Connecticut
    thanks, i was wondering where the numbers came from and how they were determined.
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