What the hell is Trim

[Indecisive]

[span style=\'color:red\']Posted by Magnum[/span]

Trim - Trim, simply put, is the size of the turbine and compressor wheels. Sometimes trim is expressed with letters or stage numbers but they actually represent a decimal number that can be calculated with these equations:

compressor trim = (inducer ^2 / exducer^2) x 100


turbine trim = (exducer^2 / inducer^2) x 100


All other things being equal the smaller the trim the less lag there will be, but the turbo may not be able to produce power at higher RPMs. A larger trim will produce more lag but have a lot of top end power.