{"product_id":"garrett-g-series-ii-g42-1325c-compact-73mm-turbocharger","title":"Garrett G-Series II G42-1325C Compact 73mm Turbocharger","description":"\u003cp\u003e\u003cstrong\u003eGarrett G-Series II G42-1325C Compact 73mm Turbocharger — Select Turbine Housing\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003ePart Number: 938339-5001S\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe Garrett G-Series II G42-1325C is a standard-rotation, dual-ceramic-ball-bearing turbocharger platform designed for high-output street, competition, and specialty-performance applications requiring G42 turbine capacity with Garrett’s compact compressor housing. Garrett currently publishes a 475–1,325 horsepower range in the product-page summary and a 500–1,325 horsepower range in its reference table, with a displacement reference of 2.0 to 7.0 liters. These are potential flywheel-horsepower figures based on compressor-map airflow and are not guaranteed wheel-horsepower ratings.\u003c\/p\u003e\n\u003cp\u003eThe G42-1325C uses a 73mm inducer and 91mm exducer compressor wheel with a 65-trim profile and 0.90 compressor-housing A\/R. The turbine stage uses an 82mm inducer and 75mm exducer wheel with an 84-trim profile. Garrett identifies the model as a 7375 reference configuration and specifies a maximum allowable turbocharger speed of 120,000 rpm.\u003c\/p\u003e\n\u003cp\u003eThe “C” designation identifies the compact compressor-housing configuration. Garrett’s dimensional drawing shows an approximately 4.00-inch hose-style compressor inlet and 3.00-inch hose-style compressor outlet, reducing compressor-cover size compared with the full-size G42 configuration while retaining the G42 turbine stage and housing family. This can materially improve packaging in confined engine compartments without changing the underlying turbine-housing choices.\u003c\/p\u003e\n\u003cp\u003eAs part of Garrett’s G-Series II range, the G42-1325C incorporates revised compressor aerodynamics that provide up to 10 percent greater compressor flow than the corresponding first-generation G-Series unit at peak pressure ratio and peak turbocharger speed. Garrett also identifies increased efficiency at high flow rates. G-Series II retains the corresponding first-generation G42 compressor- and turbine-housing interfaces, permitting an existing standard-rotation G42 installation to be upgraded when all reused component part numbers and interfaces are confirmed.\u003c\/p\u003e\n\u003cp\u003eThis listing is structured as a selectable-housing product. The Garrett 938339-5001S supercore may be combined with one of six verified standard-rotation G42 turbine housings. Three open-scroll housings use V-band turbine inlets, while three divided housings use T4 turbine inlets. Every available housing uses a V-band turbine outlet and requires an external wastegate. Garrett does not list an internally wastegated G42-1325C assembly.\u003c\/p\u003e\n\u003cp\u003eRAD recommends the 1.15 A\/R open-scroll V-band inlet and V-band outlet housing, Garrett part number 757707-0012, as the general catalog default. It occupies the middle of the available A\/R range, provides more turbine-flow capacity than the 1.01 housing, and should retain better response than the 1.28 housing. The open-scroll V-band configuration also avoids the manifold and pulse-separation requirements of a divided T4 system. Final housing selection should still be based on engine displacement, airflow, power target, exhaust-manifold design, turbine inlet pressure, and intended operating range.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eKey Features\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eGarrett G-Series II G42-1325C standard-rotation turbocharger platform\u003c\/li\u003e\n\u003cli\u003eGarrett published horsepower references: 475–1,325 hp in the page summary and 500–1,325 hp in the reference table\u003c\/li\u003e\n\u003cli\u003eGarrett displacement reference range: 2.0–7.0 liters\u003c\/li\u003e\n\u003cli\u003eGarrett turbo reference: 7375\u003c\/li\u003e\n\u003cli\u003e73mm compressor inducer and 91mm compressor exducer\u003c\/li\u003e\n\u003cli\u003e82mm turbine inducer and 75mm turbine exducer\u003c\/li\u003e\n\u003cli\u003eCompact compressor housing with hose-style inlet and outlet\u003c\/li\u003e\n\u003cli\u003eDual ceramic ball-bearing center section\u003c\/li\u003e\n\u003cli\u003eG-Series II compressor aerodynamics with up to 10 percent more flow than the corresponding first-generation G-Series compressor at peak pressure ratio and peak turbo speed\u003c\/li\u003e\n\u003cli\u003eIncreased compressor efficiency at high flow rates\u003c\/li\u003e\n\u003cli\u003eMaximum allowable turbocharger speed: 120,000 rpm\u003c\/li\u003e\n\u003cli\u003eOne-piece center-housing and backplate architecture\u003c\/li\u003e\n\u003cli\u003eTwin piston-ring sealing on both sides of the shaft assembly\u003c\/li\u003e\n\u003cli\u003eInconel turbine wheel with Garrett G-Series aerodynamics\u003c\/li\u003e\n\u003cli\u003eStainless-steel turbine housings rated by Garrett for temperatures up to 1,050°C\u003c\/li\u003e\n\u003cli\u003eWater fittings included with the supercore\u003c\/li\u003e\n\u003cli\u003eMachined compressor-housing port for an optional Garrett turbo-speed sensor\u003c\/li\u003e\n\u003cli\u003eThree open-scroll V-band inlet configurations\u003c\/li\u003e\n\u003cli\u003eThree divided T4 inlet configurations\u003c\/li\u003e\n\u003cli\u003eV-band turbine outlet on every verified housing\u003c\/li\u003e\n\u003cli\u003eExternal-wastegate configuration on every verified housing\u003c\/li\u003e\n\u003cli\u003eCompatible with the verified standard-rotation Garrett G42 housing family listed below\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eKit Includes\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eGarrett G-Series II G42-1325C supercore, part number 938339-5001S\u003c\/li\u003e\n\u003cli\u003eCompact compressor housing\u003c\/li\u003e\n\u003cli\u003eForged and fully machined compressor wheel\u003c\/li\u003e\n\u003cli\u003eCenter housing rotating assembly\u003c\/li\u003e\n\u003cli\u003eInconel turbine wheel\u003c\/li\u003e\n\u003cli\u003eGarrett water fittings supplied with the supercore\u003c\/li\u003e\n\u003cli\u003eSelected Garrett G42 turbine-housing kit when a complete housing variant is ordered\u003c\/li\u003e\n\u003cli\u003eGarrett gasket kit packaged with the selected turbine-housing kit\u003c\/li\u003e\n\u003cli\u003eSupercore-only variant excludes the turbine housing\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eTechnical Specifications\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCompressor\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eCompressor inducer: 73mm\u003c\/li\u003e\n\u003cli\u003eCompressor exducer: 91mm\u003c\/li\u003e\n\u003cli\u003eCompressor trim: 65\u003c\/li\u003e\n\u003cli\u003eCompressor-housing A\/R: 0.90\u003c\/li\u003e\n\u003cli\u003eCompressor inlet: approximately 4.00-inch hose connection\u003c\/li\u003e\n\u003cli\u003eCompressor outlet: approximately 3.00-inch hose connection\u003c\/li\u003e\n\u003cli\u003eMaximum allowable turbocharger speed: 120,000 rpm\u003c\/li\u003e\n\u003cli\u003eOptional Garrett turbo-speed sensor hardware is sold separately\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eTurbine\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eTurbine inducer: 82mm\u003c\/li\u003e\n\u003cli\u003eTurbine exducer: 75mm\u003c\/li\u003e\n\u003cli\u003eTurbine trim: 84\u003c\/li\u003e\n\u003cli\u003eTurbine-wheel material: Inconel high-temperature superalloy\u003c\/li\u003e\n\u003cli\u003eTurbine-housing material: stainless steel\u003c\/li\u003e\n\u003cli\u003eTurbine-housing temperature rating: up to 1,050°C\u003c\/li\u003e\n\u003cli\u003eAvailable turbine-housing A\/R values: 1.01, 1.15, and 1.28\u003c\/li\u003e\n\u003cli\u003eAvailable turbine inlets: open-scroll V-band or divided T4\u003c\/li\u003e\n\u003cli\u003eTurbine outlet: V-band on every listed housing\u003c\/li\u003e\n\u003cli\u003eWastegate arrangement: external wastegate required for every listed housing\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eCenter Housing, Bearings, Lubrication, and Coolant Connections\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eBearing system: dual ceramic ball bearing\u003c\/li\u003e\n\u003cli\u003eCenter-housing construction: one-piece center housing and backplate\u003c\/li\u003e\n\u003cli\u003eShaft sealing: twin piston rings on both compressor and turbine sides\u003c\/li\u003e\n\u003cli\u003eCooling: water cooled\u003c\/li\u003e\n\u003cli\u003eCoolant ports: M14 x 1.50 interfaces used with Garrett -6AN water fittings\u003c\/li\u003e\n\u003cli\u003eWater fittings are included with the supercore\u003c\/li\u003e\n\u003cli\u003eOil inlet uses a two-bolt flange interface\u003c\/li\u003e\n\u003cli\u003eOil-feed flange, restrictor if required, line, and engine-side adapter must be selected for the application\u003c\/li\u003e\n\u003cli\u003eOil-drain flange, gasket, hose, fittings, and engine-side drain provision are not included\u003c\/li\u003e\n\u003cli\u003eOil pressure, feed restriction, drain sizing, and drain routing must follow Garrett’s installation requirements for the specific engine and oiling system\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eAvailable Turbine Configurations\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e1.01 A\/R V-Band \/ V-Band — Garrett 757707-0011:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eopen-scroll V-band turbine inlet, V-band turbine outlet, external wastegate required.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e1.15 A\/R V-Band \/ V-Band — Garrett 757707-0012:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eopen-scroll V-band turbine inlet, V-band turbine outlet, external wastegate required.\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eRAD recommended general catalog default.\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e1.28 A\/R V-Band \/ V-Band — Garrett 757707-0013:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eopen-scroll V-band turbine inlet, V-band turbine outlet, external wastegate required.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e1.01 A\/R Divided T4 \/ V-Band — Garrett 757707-0014:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003edivided T4 turbine inlet, V-band turbine outlet, external wastegate required.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e1.15 A\/R Divided T4 \/ V-Band — Garrett 757707-0015:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003edivided T4 turbine inlet, V-band turbine outlet, external wastegate required.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e1.28 A\/R Divided T4 \/ V-Band — Garrett 757707-0016:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003edivided T4 turbine inlet, V-band turbine outlet, external wastegate required.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSupercore Only — Garrett 938339-5001S:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003ecompact compressor housing and complete center rotating assembly supplied without a turbine housing.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eApplication Notes\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eThis is a universal performance turbocharger and is not a vehicle-specific bolt-on assembly.\u003c\/li\u003e\n\u003cli\u003eGarrett’s horsepower figures are compressor-based potential flywheel-horsepower references. Actual output depends on engine airflow, fuel, charge-air temperature, exhaust-manifold design, turbine housing, boost pressure, backpressure, and tune.\u003c\/li\u003e\n\u003cli\u003eThe compact compressor housing reduces compressor-cover size and uses approximately 4-inch inlet and 3-inch outlet hose connections. It does not reduce the size or flow capability of the G42 turbine stage.\u003c\/li\u003e\n\u003cli\u003eThe 1.01 A\/R housings prioritize earlier response and may increase turbine inlet pressure as airflow and power rise.\u003c\/li\u003e\n\u003cli\u003eThe 1.15 A\/R housings provide the broadest general balance between response and turbine-flow capacity for many high-output applications.\u003c\/li\u003e\n\u003cli\u003eThe 1.28 A\/R housings provide the greatest exhaust-flow capacity in the verified G42 family and are best suited to applications that can accept slower boost response.\u003c\/li\u003e\n\u003cli\u003eThe open-scroll V-band housings are generally the simpler choice for custom single-turbo systems because they do not require a true divided manifold and pulse-preserving wastegate arrangement.\u003c\/li\u003e\n\u003cli\u003eThe divided T4 housings should be used with a properly divided manifold and an external-wastegate arrangement that preserves the intended pulse separation. Installing a divided housing on an undivided manifold does not provide the same twin-scroll behavior.\u003c\/li\u003e\n\u003cli\u003eNo internally wastegated G42-1325C configuration is listed by Garrett. An appropriately sized external wastegate system is required.\u003c\/li\u003e\n\u003cli\u003eThe G42-1325C supercore is compatible only with the verified standard-rotation G42 housings listed in this description. Reverse-rotation housings are not interchangeable.\u003c\/li\u003e\n\u003cli\u003eG-Series II uses the corresponding first-generation G42 compressor- and turbine-housing interfaces, but every existing installation should be confirmed by part number before components are reused.\u003c\/li\u003e\n\u003cli\u003eTurbine-inlet flange or clamp, turbine-outlet weld flange and clamp, external wastegate, wastegate springs, oil-feed hardware, oil-drain hardware, coolant hoses, intake plumbing, charge piping, exhaust manifold, downpipe, boost-control hardware, and application-specific fasteners are not included unless separately stated.\u003c\/li\u003e\n\u003cli\u003eGarrett turbo-speed monitoring hardware and electronic boost-control components are sold separately.\u003c\/li\u003e\n\u003cli\u003eFinal turbocharger and turbine-housing selection should be based on an engine-airflow model and intended operating range rather than displacement or peak-power target alone.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eEmissions and Competition-Use Notice\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cem\u003eThis universal performance turbocharger is intended for racing and competition applications. Vehicle modifications must comply with all applicable emissions, registration, noise, and road-use requirements. It is the purchaser’s responsibility to determine whether the product is legal for the intended vehicle and use.\u003c\/em\u003e\u003c\/p\u003e","brand":"Garrett","offers":[{"title":"Supercore Only - No Turbine Housing (+$0)","offer_id":46282592878649,"sku":null,"price":2897.82,"currency_code":"USD","in_stock":true},{"title":"Supercore + 757707-0011 1.01 V-band Open V-band External (+$1014.18)","offer_id":46282603626553,"sku":null,"price":3912.0,"currency_code":"USD","in_stock":true},{"title":"Supercore + 757707-0012 1.15 V-band Open V-band External (+$1014.18)","offer_id":46282603659321,"sku":null,"price":3912.0,"currency_code":"USD","in_stock":true},{"title":"Supercore + 757707-0013 1.28 V-band Open V-band External (+$1014.18)","offer_id":46282603692089,"sku":null,"price":3912.0,"currency_code":"USD","in_stock":true},{"title":"Supercore + 757707-0014 1.01 T4 Divided V-band External (+$1066.18)","offer_id":46282603724857,"sku":null,"price":3964.0,"currency_code":"USD","in_stock":true},{"title":"Supercore + 757707-0015 1.15 T4 Divided V-band External (+$1066.18)","offer_id":46282603757625,"sku":null,"price":3964.0,"currency_code":"USD","in_stock":true},{"title":"Supercore + 757707-0016 1.28 T4 Divided V-band External (+$1066.18)","offer_id":46282603790393,"sku":null,"price":3964.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0809\/8512\/9017\/files\/G42-1325C.png?v=1786033058","url":"https:\/\/rad-power.com\/products\/garrett-g-series-ii-g42-1325c-compact-73mm-turbocharger","provider":"RAD","version":"1.0","type":"link"}