How do you measure a turbo size?

Posted by AWD1gTalon, Mar 18, 2004
Newbie Forum - Beginner DSM modification questions and discussions. Common, repetitive, and general discussions will get dumped here from other tech forums. Unless you're a Probationary member you shouldn't post threads here.

  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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