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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. Probationary Members must limit their tech posts to this forum and sub-forums.

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Old 03-18-2004, 06:19 AM Show Printable Version Show Printable Version   Email this Post to a Friend Email this Post      #1 (permalink)
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Registered: Feb 2004
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How do you measure a turbo size?


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.


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Old 03-18-2004, 06:40 AM Show Printable Version Show Printable Version   Email this Post to a Friend Email this Post      #2 (permalink)
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50trim means the wheel it uses.

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Old 03-18-2004, 07:38 AM Show Printable Version Show Printable Version   Email this Post to a Friend Email this Post      #3 (permalink)
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More specifically, the Compressor wheel.


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Old 03-18-2004, 08:27 AM Show Printable Version Show Printable Version   Email this Post to a Friend Email this Post      #4 (permalink)
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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.

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Old 03-18-2004, 08:53 AM Show Printable Version Show Printable Version   Email this Post to a Friend Email this Post      #5 (permalink)
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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.
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Old 03-18-2004, 09:00 AM Show Printable Version Show Printable Version   Email this Post to a Friend Email this Post      #6 (permalink)
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thanks, i was wondering where the numbers came from and how they were determined.

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