Turbo General Information |
Sources include: Z32 Wiki
|
Parallel Twin Turbocharging
The Z32, in Twin Turbo form, utilises two turbochargers manufactured by Garrett.
They are installed in a parallel twin turbo arrangement. This means that each turbo is fed by (and feeds) three cylinders; one half of the engine. Because each turbocharger only has to provide boost for three cylinders, they can be made much smaller than if used in a single-turbo setup. The smaller size allows them to accelerate (or spool up) much more quickly than one large turbo, providing faster response.
The parallel twin turbo setup is in contrast to a sequential twin turbo setup, such as that utilised by the Toyota Supra. In such a setup, one small turbo is used at the lower speeds, and the system gradually switches to a large turbo for the top-end.
The Z32, in Twin Turbo form, utilises two turbochargers manufactured by Garrett.
They are installed in a parallel twin turbo arrangement. This means that each turbo is fed by (and feeds) three cylinders; one half of the engine. Because each turbocharger only has to provide boost for three cylinders, they can be made much smaller than if used in a single-turbo setup. The smaller size allows them to accelerate (or spool up) much more quickly than one large turbo, providing faster response.
The parallel twin turbo setup is in contrast to a sequential twin turbo setup, such as that utilised by the Toyota Supra. In such a setup, one small turbo is used at the lower speeds, and the system gradually switches to a large turbo for the top-end.
Specifications
Stock Z32 TT turbos are Garrett TB02/22 turbos. They carry the following specifications:
Stock Z32 TT turbos are Garrett TB02/22 turbos. They carry the following specifications:
|
Compressor
|
Turbine
|
- These turbos use a 270 degree thrust bearings (journal bearings) in the CHRA.
- Water cooling is used for longevity.
- Internal Wastegates are used for compactness.
- Manual transmission cars had turbos with an A/R trim of .63 automatic transmission cars, .54.
- Left and Right turbos are interchangeable, but will require re-clocking and swapping of its associated components (coolant pipes, oil pipes, intake/outlet pipes, wastegate actuator brackets, etc).
Stock turbochargers are known for their quick spool-up, but are limited to around 16 PSI of boost before they become inefficient. Despite this, stock turbochargers have made close to 500 HP on a stock engine.
What is A/R Turbo Housing Ratio
The A/R turbo ratio (Area/Radius) describes a geometric characteristic of all compressor and turbine housings.
Technically, it is defined as:
the inlet (or, for compressor housings, the discharge) cross-sectional area divided by the radius from the turbo centre line to the centre of that area. It is a term defining the properties of the compressor or turbine housing’s curved scroll.
The A/R turbo ratio (Area/Radius) describes a geometric characteristic of all compressor and turbine housings.
Technically, it is defined as:
the inlet (or, for compressor housings, the discharge) cross-sectional area divided by the radius from the turbo centre line to the centre of that area. It is a term defining the properties of the compressor or turbine housing’s curved scroll.
