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Old 09-09-2019, 05:02 PM   #25
86Dreams
Scooby Specialist
 
Member#: 385256
Join Date: Mar 2014
Chapter/Region: Tri-State
Location: Harriman NY
Vehicle:
V7 S204
'19 Giulia Q4

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https://www.garrettmotion.com/racing...turbo/gt3582r/

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.
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