Granatelli 44mm Wastegate Traditional Diaphragm Design - 540244

You Don’T Always Need The Biggest Wastegate — You Need The Right One.

The Granatelli 540244 44mm external wastegate delivers precise turbo boost control in a compact package designed for street, street/strip and custom turbocharger systems.

Its water-cooled diaphragm actuator provides a heat-management advantage for installations close to hot exhaust components while the 44mm valve keeps packaging manageable in tighter engine bays.

• 44MM Compact Wastegate DIAPHRAGM Actuation Style WATER-COOLED Heat Management

Good For

• ✓ Street turbo builds
• ✓ Street/strip applications
• ✓ Tight turbo manifolds
• ✓ Custom fabrication
• ✓ External wastegate boost-control systems
• Included
• V-Band Inlet / Outlet Flanges, Clamps & Five Springs (4.0, 4.5, 5.7, 6.5 & 12 PSI)
• 44mm valve in a compact package for tighter engine bays
• Water-cooled diaphragm actuator with -4AN water fittings for installs close to hot exhaust parts
• 2 top and 2 bottom air ports for spring-only or boost-controller plumbing
• Ships with V-band flanges, clamps and five boost springs (4.0–12 PSI)
• Works for many single- and twin-turbo street builds

Before You Order

Wastegate size depends on turbo size, engine displacement, exhaust flow, manifold design and target boost. Not sure between 44, 50 and 60mm?

What does an external wastegate do? It routes exhaust around the turbine once your target boost is reached, which keeps boost pressure under control.

What comes in the box? The wastegate, V-band inlet and outlet flanges and clamps, and five boost springs rated at approximately 4.0, 4.5, 5.7, 6.5 and 12 PSI.

Is 44mm the right size for my build? 44mm suits many single- and twin-turbo street builds where a 50mm or 60mm gate isn't needed. Bigger turbos and high exhaust-flow engines may need a 50mm or 60mm.

What sets the boost level? The wastegate spring sets the mechanical base boost.

Why water-cooled? Water cooling helps manage diaphragm and actuator temperature when the gate sits close to hot exhaust parts. The 540244 uses -4AN water fittings.

Do I still need a blow-off valve? On most turbo builds, yes. The wastegate controls boost on the exhaust side; a blow-off valve releases intake pressure when the throttle closes.