The G30-770

Here are the technical details of the G30-770 turbo with a 1.01 A/R turbine housing:

Compressor Side:

  • Compressor Wheel: The G30-770 is equipped with a high-performance compressor wheel designed for maximum airflow. The exact specifications of the wheel may vary, but it typically features an inducer diameter of around 58mm.
  • Trim: The compressor wheel trim is usually specified as 84 or similar, indicating its size and design characteristics.
  • Housing: The compressor housing is meticulously engineered to provide efficient and unrestricted airflow, optimizing the performance potential of the compressor wheel.

Turbine Side:

  • Turbine Wheel: The turbine wheel of the G30-770 is designed for high-performance applications, typically featuring a diameter of approximately 68mm. This larger wheel size allows for increased exhaust gas flow and higher power potential.
  • Trim: The turbine wheel trim is typically specified as 84 or similar, highlighting its size and design for efficient exhaust gas flow.
  • Housing: The turbine housing is designed to handle high exhaust gas temperatures while maintaining optimal flow characteristics. The 1.01 A/R (Area/Radius) turbine housing is commonly used with the G30-770 to achieve a balance between low-end response and top-end power.


  • Boost Pressure: The G30-770 turbocharger is known for generating substantial boost pressure. With proper supporting modifications and engine tuning, it can produce boost levels of approximately 2.5 bar (36.25 psi) or more, depending on specific application and setup.
  • Power Output: The G30-770 is designed to support high-horsepower applications. It is capable of producing power outputs ranging from 700 to 800+ horsepower at the wheels, depending on supporting modifications, fuelling, and tuning.
  • Response and Spool: The larger size of the G30-770 turbo and the 1.01 A/R turbine housing may result in a slightly slower spool compared to smaller turbos. However, the combination of a larger compressor and turbine wheel provides excellent top-end power and performance.

Here’s the table with the approximate maximum airflow in pounds per minute (lb/min) for the pair of HKS 2530 turbochargers and a single G30-770 turbocharger at a pressure ratio of 2.5 bar absolute:

Engine Speed (RPM)HKS 2530 Turbochargers Maximum Airflow (lb/min)G30-770 Turbocharger Maximum Airflow (lb/min)
800045 – 5055 – 60
700040 – 4550 – 55
600035 – 4045 – 50
500030 – 3540 – 45

From this, the G30-770 should be able to provide an extra 10lb/min over the 2530s, which is nearly 100bhp.

Here’s a comparison table with approximate RPM ranges for the G30-770 turbocharger alongside the HKS 2530 turbochargers:

Boost Pressure (psi)HKS 2530 Turbochargers RPM Range (Approximate)G30-770 Turbocharger RPM Range (Approximate)
01,500 – 2,500 RPM1,000 – 2,000 RPM
52,500 – 3,500 RPM2,000 – 3,000 RPM
153,500 – 4,500 RPM3,000 – 4,500 RPM
204,000 – 5,000 RPM4,000 – 5,500 RPM
254,500 – 5,500 RPM4,500 – 6,000 RPM

So, the G30-770 should be spooling anything up to 1000rpm earlier. Hopefully more when you take into consideration the upgraded cams that I’ve gone for. With no additional peak power, I’ll have more power in more places, more of the time, resulting in a quicker car point to point. Ready for the next slap! Adventures trip to Scotland

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