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Message: <blockquote data-quote="jinkl" data-source="post: 315424" data-attributes="member: 3008">Airflow in lbs per minute = diameter of wastegate in mm X boost correction factorSo let's apply it to your car;300 rwkw = 480 bhp480 bhp = 44 lbs of airflow = 44 mm wastegateNow if you want to run 19 psi, then that's the right size wastegate.But we need to apply the boost correction.... My experience indicates that to get 300 rwkw out of a GT3040 you would need to run around 1.5 bar (22psi). So using the formula...44 / 22 X 19 = 38 mm.</blockquote>

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