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Old 09-10-2019, 01:06 AM   #26
Scooby Newbie
Member#: 125064
Join Date: Sep 2006
Location: Jamaica
2013 JDM STI spec C


Originally Posted by 86Dreams View Post

look at the compressor map for yourself. compare boost vs airflow.

Tapering boost controls the speed of the compressor wheel.
Tapering becomes necessary when the compressor is at its limits.
However, consider the vertical line at 55lbs/min, if youre starting at like 20 psi and 30lbs/min at and run out to 55lbs then tapering and maintaining a constant compressor speed will push the turbo into a region that is less efficient than if it climbed up to about 26psi and 55lbs instead.

Efficiency is heat, so at 76% efficiency the air coming out of the turbo is cooler than at 66% efficiency.
I'm not a big turbo expert, could u explain in a slightly easier way? This means that u agree with the tune?

About the rods, I thought ej207 had that weakness as bad, glad to hear it's stronger....
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