Calculate required wastegate flow area to bypass sufficient exhaust gas and regulate target boost pressure.
Input Parameters
Results
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Exhaust Mass Flow
lb/min
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Required Bypass Flow
lb/min
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Min Wastegate Diameter
mm
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Wastegate Flow Area
in²
Note: External wastegates typically range 38-60mm. Internal wastegates are often undersized for high-boost applications above 20 psi.
Reference
Fuel Flow = HP x BSFC / 60
Air Flow = Fuel Flow x AFR
Exhaust Flow = Air + Fuel
Bypass % = (Exhaust Flow - Turbine Capacity) / Exhaust Flow
Wastegate Area = Bypass Flow / (Cd x P x sqrt(2g/(k x R x T)))