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Old 02-07-2010, 04:23 PM   #411
Scooby Newbie
Member#: 116814
Join Date: Jun 2006
Location: Colorado Springs
2003 wrx wagon


After thinking about the larger turbine wheel in the stock housing question a bit more, I have changed my mind about my previous post. In order to fit the larger wheel into the housing, it will be necessary to bore out the turbine exit. As a result, the exit area will increase (~15% increase for TD04H wheel and ~35% increase for the TD05E wheel). This should allow a higher flow of exhaust gases through the turbine, both increasing turbine efficiency, and preventing excessive back pressure and control issues.

Low-end performance should still be good (but not as responsive as the stock hotside), since the exhaust velocity entering the turbine will be higher than that seen in a TD05H hotside at low engine speeds (low exhaust energy).

Upper range performance should improve over the TD04-19T with stock turbine wheel, both due to higher turbine efficiency and better balance with the flow capability of the 19T compressor.

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Last edited by knuts; 02-07-2010 at 04:32 PM. Reason: more info
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