slipsittin Posted January 19, 2009 Share Posted January 19, 2009 What do all those turbo specs mean? A/R is the Area to Radius ratio...literally a measurement of the size of the exhaust housing. Picture of a/r measurement from Garrett Turbos: A Stage III exhaust wheel is a larger/higher flow version of a standard Stage I wheel. The physical dimensions of the wheel are larger. These require a Stage III exhaust housing that matches the shape and size of the Stage III wheel. The stock T3 has an exducer diameter of 1.898" and a major diameter of 2.319" The stage II T3 has an exducer diameter of 2.122" and a major diameter of 2.559" The stage III T3 has an exducer diameter of 2.229" and a major diameter of 2.559" Trim is a ratio of the minor (inducer) diameter compared to the major (exducer) diameter of the compressor wheel as calculated below. Pics from Garrett Turbos: Partial Source: TurboByGarrett.com - Turbo Tech101 360 degree bearing means the thrust bearing is a complete circle, not cut out in one section like the 270 degree bearing. Obviously a full bearing will provide more thrust support than a partial bearing which makes a 360 bearing better for performance applications. Adiabatic Efficiency of a Compressor: The ratio of the work input required to raise the pressure of a gas to a specified pressure as related to the actual work input. Basically it shows how efficient the compressor wheel design is at pressurizing the air to a certain pressure/ how well it can pump air without heating the air more than thermodynamic law says it should. Quote Link to comment Share on other sites More sharing options...
efp0wa Posted January 20, 2009 Share Posted January 20, 2009 http://www.turbobygarrett.com/turbobyga ... ch102.html Quote Link to comment Share on other sites More sharing options...
slipsittin Posted January 21, 2009 Author Share Posted January 21, 2009 Thats the link I was trying to post but it didn't work when I tried to click on it. Cheers for that, Corey Quote Link to comment Share on other sites More sharing options...
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