Wastegate Sizing Calculator

Determine the optimal wastegate size for your turbo setup based on power output and boost requirements.

Target Horsepower

Boost Pressure (psi)

Engine Displacement (L)

Turbo Exhaust A/R

Exhaust Gas Temp (°F)

Exhaust Flow Rate

56.84 lb/min

Required Wastegate Flow

45.32 lb/min

Required Orifice Area

1.254 sq in

Required Diameter

1.26"

Recommended Wastegate Size

38mm (1.5")

Wastegate Type

Single Internal or Small External

Base Spring Pressure

7 psi

Boost Control

Manual boost controller or spring pressure adjustment

Internal: Compact, integrated into turbo housing, limited flow capacity
External: Greater flow, better control, requires dedicated dump tube
Undersized wastegate: Causes boost creep and inability to control boost
Spring selection: Choose spring 3-5 psi below target boost for controller headroom