Garrett G-Series Turbo G42-1200

The G-Series G42-1200 standard rotation turbo with compact housing. You'll choose the Supercore, then choose the exhaust housing which will include matching clamps (and/or gaskets). Housings are available in T4 and V-band (VB) configurations. Designed for use with an external wastegate.

To buy a full turbo, you'll need to add a Supercore and an Exhaust Housing to your cart. They are sold separately. If you need any help, please give us a call.

Each Supercore and each Exhaust Housing Kit will be different depending on your selected options. The housings will include v-band clamps (and a gasket if choosing the T4 option). The Supercore includes no additional accessories. The Supercore and 1.01 V-Band housing are pictured in detail for reference. The Supercore weighed in at 14.90 pounds and the housing at 15.40.

What flanges, fittings and clamps will I need for install?
Oil restrictor fittings are built-in to the turbo, you'll need a -4AN feed line and 1/8" NPT fitting. The water fittings are -6AN. Inlet and outlet flanges for building a manifold or downpipe, fittings and drain lines are listed in the table.
• Flange Dimensions PDF



Features:
• G-Series Compressor Aerodynamics for Maximum HP
• 73mm Turbocharger Compressor Wheel
• Compact Compressor Housing Saves Space
• New Turbine Aero Provides Higher Flow and Efficiency
• Stainless Steel Turbine Housings Rated up to 1050°C
• Oil Restrictor and Water Fittings Included
• Fully Machined Speed Sensor and Pressure Ports
• One Piece Center Housing with 360° Rotation (Non-Wastegated Only)
• Speed Sensor Port

Warning:
Maximum allowable turbocharger speed is 118krpm. The use of this product above max turbocharger speed is at the owner’s risk, and can result in damage and premature failure. To protect the turbocharger from overspeed when operating, a speed sensor can be installed into the compressor housing to monitor shaft speed.

Note:
Performance results of this product are highly dependent upon your vehicle’s modifications and tuning/calibration. The horsepower numbers represented above are calculated based strictly on choke flow of the compressor map (total turbo capability), which represents the potential flywheel horsepower.

Speed Sensor Port:
The compressor housing features a fully machined ported shroud to help reduce compressor surge. A fully machined speed sensor port provides enthusiasts the option to add the new G Series speed sensor to measure turbocharger shaft speed, a key factor in determining ideal operating conditions. The new speed sensor is easy to install and does not need to be adjusted for length like previous sensors. Simply remove and plug, then insert the speed sensor and tighten the bolt. The new speed sensor is sold separately and is not compatible with GT and GTX sensors due to the new design and sizing.

The addition of an o-ring between the compressor housing and backplate reduces the possibility of boost pressure leakage.
Speed Sensor Kits are sold separately:
• 781328-0003 or 781328-0004

• Aluminum backplate for reduced weight (GTX42 Steel)
• Includes (2) -6AN water fittings
• Center housing to turbine housing Vband connection makes installation easy for installers (Same Vband as GTX42/GTX45)
• GTX and GT turbine housings are not interchangeable
• Full 360 degree orientation of compressor housing and non wastegated turbine housings
• An oring between the compressor housing and backplate reduces any boost pressure leakage

• Twin piston rings on both sides of the shaft reduce the likeliness of oil leakage from the center housing to the compressor or turbine stage
• A new oil deflector redirects oil away from the compressor stage seals reducing possibility of oil leakage through the seals
• 10mm ceramic dual ball bearing cartridge (Same as GTX42)

• The turbine wheel features all new aerodynamics to improve flow and boost response
• Inconel super alloy construction for temperatures up to 950C
• New turbine wheel flows 10% more and has peak efficiency of 77% (Compared to GTX42 at 74% with 1.01A/R)
• 82mm inducer / 75mm exducer 84 Trim

• G42 turbine housings are made from stainless steel to provide ultimate durability and temperature capability up 1742°F
• B&C qualified
• GTX and GT housings not interchangeable
• Turbine housings are available in V-band, open, free float configurations for launch
• V-band inlet is 3.6" / 92mm ( compared to GTX30/35 3" / 76mm
• V-band outlet is 4.3" / 109mm

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