Turbosmart StraightGate50 Pneumatic (pSG50) 50mm External Wastegate

The Turbosmart StraightGate50 Pneumatic is not a traditional wastegate.

It’s a complete rethink of how boost control should work.

Unlike conventional poppet-style external wastegates, the StraightGate50 uses a zero-offset butterfly valve design — delivering enormous flow capacity, near-linear control characteristics and unprecedented tuning range.

This is the world’s highest-flowing 50mm external wastegate.

What Makes the StraightGate50 Different?

Most external wastegates use a poppet valve.

That means exhaust gas must turn 90 degrees to exit the valve seat.

The StraightGate50 doesn’t.

It uses a centrally pivoting, zero-offset butterfly valve that allows exhaust gas to flow straight through the body with minimal disruption.

The result:

• 383.9 CFM / 10.87 m³ per minute flow
• Reduced turbulence
• Improved response
• Greater bypass authority
• More stable boost control

Flow matters — but control matters more.

Self-Balancing Butterfly Design

The butterfly valve is subjected to exhaust drive pressure equally across both halves.

This means the valve self-balances against drive pressure.

Unlike traditional gates that must fight increasing exhaust pressure at high boost, the StraightGate50 requires less actuator force to remain stable.

The result?

• Reduced actuator strain
• More consistent boost control
• Wider usable tuning window
• Improved performance at extreme drive pressures

This is especially important in high boost, high backpressure applications.

Pneumatic (Boost-Based) Control – Simplified Power

The Boost-Based Pneumatic StraightGate50 (pSG50) takes the award-winning electronic eSG50 platform and simplifies it with a traditional boost-based actuator.

Pre-fitted with 6 psi springs and featuring both single and twin port control, the pSG50 provides:

• Simple mechanical boost control
• Wide tuning capability
• Compatibility with conventional boost controllers
• Over 5x base spring pressure tuning range

The self-balancing design allows a huge tuning window compared to conventional wastegates.

Why Choose the StraightGate50?

The StraightGate50 is ideal for:

• High horsepower drag builds
• Time attack and circuit racing
• High drive pressure turbo setups
• Applications where poppet gates struggle
• Builders chasing ultimate boost control

This is not just a replacement for a 50mm poppet wastegate — it’s a different class of product.

Key Technical Features

• 50mm (1.97in) zero-offset butterfly valve
• 383.9 CFM / 10.87 m³ per minute flow
• Stainless Steel (630) butterfly and shaft
• Stainless Steel (347) main body
• Heat-treated 431 stainless steel V-band clamps
• Aluminium (6262 T6 anodised) actuator bracket
• Turbosmart locking collar ring
• Base spring options from 6 psi to 42 psi
• Suitable for single or twin port boost-based control
• Nitronic 60 stainless steel linkages and control arm

Designed, validated and tested in-house by Turbosmart.

Frequently Asked Questions

What is the difference between the StraightGate50 and a traditional wastegate?

Traditional wastegates use a poppet valve that forces exhaust gas to turn 90 degrees.

The StraightGate50 uses a straight-through butterfly valve, dramatically increasing flow and improving boost stability.

Is the StraightGate50 better than a ProGate50?

They are different architectures.

The ProGate50 is a high-performance poppet-style gate.

The StraightGate50 is a butterfly-style gate offering significantly higher flow and wider tuning window — particularly beneficial in high drive pressure environments.

Can I use a standard boost controller?

Yes.

The pSG50 is boost-based pneumatic and supports both single and twin port control, making it compatible with conventional boost control systems.

How much boost can it handle?

Spring options range from 6 psi to 42 psi base pressure, and due to the self-balancing design, the effective tuning window exceeds 5 times base spring pressure.

Actual boost capability depends on system design.

Why Buy From Walton Motorsport?

We don’t just sell wastegates.

As a turbo manifold manufacturer, we understand how:

• Drive pressure
• Turbine housing selection
• Collector design
• Backpressure ratios

…impact wastegate performance.

The StraightGate50 is not necessary for every build — but when it’s required, it solves problems traditional wastegates cannot.

If you’re running high drive pressure or pushing boost control limits, speak to us before ordering.