Turbosmart Pneumatic Straight Gate 50 (PSG50) External Wastegate
The best flow currently available on any wastegate on the planet. Turbosmart threw the wastegate design book out the window and revolutionized the boost control world with the butterfly wastegate. First launched in the industry-leading StraughtGate50 (e-SG50) and is now available with traditional pneumatic control.
The StraightGate50 from Turbosmart is the world’s highest-flowing external wastegate! The StraightGate50 is a zero-offset butterfly-style wastegate that allows enormous flow and almost linear control, and unparalleled boost control throughout the entire operating range.
The Boost-Based Pneumatic StraightGate50 takes the Multiple Award Winning eSG50 and simplifies control via a traditional boost-based actuator. The Self-Balancing nature of the StraightGate50 means a huge tuning window of over 5 times base spring pressure can be obtained! Pre-fitted with 6 psi springs to the GenV actuator featuring both single & Twin port control, the StraightGate50 is simple to use, and packed with performance, flow and features!
The Turbosmart StraightGate50 has been designed from the ground up & validated in-house to create a new level of control and flow, never seen in a wastegate before. The zero-offset butterfly valve is subjected to exhaust drive pressure equally on both halves of the valve, which pivots centrally, resulting in a self-balanced valve against any drive pressure. This self-balancing means less work is required to act against even the highest drive pressures, and a wider tuning window is possible, no matter how the valve is actuated. The increased flow is achieved through the efficiency of a straight-through valve versus a poppet-style valve where the exhaust gas must be turned 90 degrees by the valve.
Electronic eSG50 StraightGate50
Pneumatic (Boost-Based) pSG50 StriaghtGate50
Pneumatic (Vacuum-Based) pSG50v StraightGate50
50mm (1.97in) Butterfly Style Zero-Offset Valve
383.9 CFM / 10.87m3 per minute flow
Stainless Steel (630) Butterfly and shaft
Stainless Steel (347) Main Body
Stainless Steel (Heat Treated 431) V-Band Clamps
Aluminium (6262 T6 Anodised) Bracket & Actuator
Turbosmart unique Locking Collar Ring
Base Spring Options from 6psi to 42psi
Suitable for Single or Twin Port Boost-Based Control
Stainless Steel (N60) Linkages & Control Arm
What is the first rule of boost control?
Ensure you have an over-boost cut-out. This is a safety feature built into basically all factory, aftermarket & programmable ECUs. You can never be too careful. Make sure it is set to a sensible& reasonable limit. Increasing the boost will put more load on your engine and there are other tune-related factors you must consider. If in any doubt, speak with a professional tuner/calibrator.
What is the StraightGate all about?
The StraightGate50 from Turbosmart is a butterfly-style external wastegate that uses a zero-offset and self-balancing butterfly valve to control exhaust gas flow. Unlike the traditional poppet-style valve, these wastegates both flow extremely high amounts of gas thanks to the efficiency of such a valve, over a poppet style, but also much greater control. All wastegates have a dynamic performance where the flow can be measured against lift. A Poppet style generally has a relatively large amount of flow at the initial opening and low lift which hen tends to flatten out as the valve lifts. StriaghtGate50 by comparison has a very linear flow versus opening angle, especially as greater resolution around the initial opening and low opening angles.
Yes. The StriaghtGate50 uses a zero-offset style butterfly valve, and this means at any point in time, the exhaust gas energy is applied to the valve is offset by the fact the force is being applied to the side of the valve that opens as well as the side of the valve that closes. This effective force equals zero meaning theoretically, no matter what force is applied it is balanced out with no effect on valve position. This means the wastegate is massively easier to control which means lighter springs can be used, a faster response can be achieved, and better real-world performance and reliability.
Over 5 X Base Pressure?
Yes. Traditional Poppet style wastegates can generally achieve between 2-3 times the base spring pressure in overall pressure. That is, for 10 psi of base spring pressure, it is likely you can achieve between 20-30psi of overall pressure with reference manipulation and boost control. The StraightGate50 however benefits from the self-balancing zero-offset butterfly valve and due to this, can provide a much larger tuning window. The StriaghtGate50 can achieve more than 5 times the base pressure so for the same 10psi spring example above, you can expect over 50psi total boost with reference manipulation and boost control.
What do I need to Control them?
Unlike the Electronic StraightGate50 which requires an advanced control strategy, the Pneumatic Series of StraightGate50 requires fairly common control strategies. A simple Boost-Tee will run make great results from the Boost-Based version while traditional Vacuum-Based strategies will work perfectly on the Vac-Based StriaghtGate50. It’s simple reference manipulation and controlled bleed – the kind of boost control that has been around and common place for decades.
What Mounting Options do I have?
The V-Band allows rotation through 360 degrees with no impact on valve operation. Further to this, the Billet Actuator bracket can be clocked to any one of the three options provided by the 3-pin mounting system providing a huge range of mounting options to fit into even the most complex and packed modern engine bay. There are design elements to ensure the least heat transfer possible into the diaphragm housing and we have validated this to 1300 Degrees C with no impact on performance and reliability. Like all things, however, the best way to mount the unit would be to acknowledge the basics… Exhausts and manifolds are hot & heat rises further away from the heat source and where possible, below it (rather than directly on-top) is ideal if possible. Also, to note, even OEM actuators on turbocharged factory cars place actuators in front of the turbo, in a stream of engine bay air-flow so offering your wastegate the same courtesy, will ensure a long and trouble-free service life.