{"product_id":"garrett-g-series-ii-g40-1250-71mm-turbocharger","title":"Garrett G-Series II G40-1250 71mm Turbocharger","description":"\u003cp\u003e\u003cstrong\u003eGarrett G-Series II G40-1250 71mm Turbocharger — Select Turbine Housing\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003ePart Number: 938272-5002S\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe Garrett G-Series II G40-1250 is a standard-rotation, dual-ceramic-ball-bearing turbocharger platform designed for high-output street, competition, and specialty-performance applications requiring substantial compressor flow in Garrett’s G40 frame. Garrett rates the G40-1250 for 500–1,250 horsepower and references engine displacements from 2.0 to 6.0 liters. Garrett horsepower ratings represent potential flywheel horsepower based on compressor-map airflow and are not a guaranteed wheel-horsepower figure.\u003c\/p\u003e\n\u003cp\u003eThe G40-1250 uses a 71mm inducer and 88mm exducer compressor wheel with a 65-trim profile and 0.80 compressor-housing A\/R. The turbine stage uses a 77mm inducer and 70mm exducer wheel with an 84-trim profile. Compared with the G40-1000, the G40-1250 retains the same turbine dimensions and housing family while using the larger 71mm compressor, making it appropriate where the application requires greater compressor-flow capability without moving to the larger G42 frame.\u003c\/p\u003e\n\u003cp\u003eAs part of Garrett’s G-Series II range, the G40-1250 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 standard-rotation G40 compressor- and turbine-housing interfaces, permitting an existing G40 installation to be upgraded when all reused housing part numbers and interfaces are confirmed.\u003c\/p\u003e\n\u003cp\u003eThis listing is structured as a selectable-housing product. The Garrett 938272-5002S supercore may be combined with one of eight verified standard-rotation G40 turbine housings. Four open-scroll housings use V-band turbine inlets, while four 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 G40-1250 assembly.\u003c\/p\u003e\n\u003cp\u003eRAD recommends the 1.06 A\/R open-scroll V-band inlet and V-band outlet housing, Garrett part number 757707-0029, as the general catalog default. It provides more turbine-flow capacity than the 0.85 and 0.95 A\/R housings while avoiding the slower response and more specialized operating range associated with the largest 1.19 A\/R option. 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 G40-1250 standard-rotation turbocharger platform\u003c\/li\u003e\n\u003cli\u003eGarrett horsepower reference range: 500–1,250 hp\u003c\/li\u003e\n\u003cli\u003eGarrett displacement reference range: 2.0–6.0 liters\u003c\/li\u003e\n\u003cli\u003e71mm compressor inducer and 88mm compressor exducer\u003c\/li\u003e\n\u003cli\u003e77mm turbine inducer and 70mm turbine exducer\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\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\u003eHigh-temperature turbine-wheel construction\u003c\/li\u003e\n\u003cli\u003eStainless-steel turbine housings rated by Garrett for temperatures up to 1,050°C\u003c\/li\u003e\n\u003cli\u003eMachined compressor-housing port for an optional Garrett turbo-speed sensor\u003c\/li\u003e\n\u003cli\u003eFour open-scroll V-band inlet configurations\u003c\/li\u003e\n\u003cli\u003eFour 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 G40 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 G40-1250 supercore, part number 938272-5002S\u003c\/li\u003e\n\u003cli\u003eCompressor 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\u003eTurbine wheel\u003c\/li\u003e\n\u003cli\u003eSelected Garrett G40 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: 71mm\u003c\/li\u003e\n\u003cli\u003eCompressor exducer: 88mm\u003c\/li\u003e\n\u003cli\u003eCompressor trim: 65\u003c\/li\u003e\n\u003cli\u003eCompressor-housing A\/R: 0.80\u003c\/li\u003e\n\u003cli\u003eCompressor inlet: approximately 4.00-inch hose connection\u003c\/li\u003e\n\u003cli\u003eCompressor outlet: approximately 2.50-inch hose connection\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: 77mm\u003c\/li\u003e\n\u003cli\u003eTurbine exducer: 70mm\u003c\/li\u003e\n\u003cli\u003eTurbine trim: 84\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: 0.85, 0.95, 1.06, and 1.19\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\u003eCooling: water cooled\u003c\/li\u003e\n\u003cli\u003eEngine-oil supply and gravity oil drain required\u003c\/li\u003e\n\u003cli\u003eOil-feed components, any required restrictor, 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\u003eCoolant fittings, hoses, and engine-side connections must be confirmed for the selected installation\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\u003e0.85 A\/R V-Band \/ V-Band — Garrett 757707-0027:\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\u003e0.95 A\/R V-Band \/ V-Band — Garrett 757707-0028:\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\u003e1.06 A\/R V-Band \/ V-Band — Garrett 757707-0029:\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\u003e1.19 A\/R V-Band \/ V-Band — Garrett 757707-0030:\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\u003e0.85 A\/R Divided T4 \/ V-Band — Garrett 757707-0032:\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\u003e0.95 A\/R Divided T4 \/ V-Band — Garrett 757707-0033:\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\u003e1.06 A\/R Divided T4 \/ V-Band — Garrett 757707-0034:\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\u003e1.19 A\/R Divided T4 \/ V-Band — Garrett 757707-0035:\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 938272-5002S:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003ecompressor 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 500–1,250 horsepower range is a compressor-based flywheel-horsepower reference. 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 G40-1250 uses the same 77\/70mm turbine dimensions and standard-rotation G40 housing family as the G40-1000, but its larger 71mm compressor is intended for greater airflow and power capability.\u003c\/li\u003e\n\u003cli\u003eThe 0.85 and 0.95 A\/R housings prioritize earlier boost response and may increase turbine inlet pressure as airflow and power rise.\u003c\/li\u003e\n\u003cli\u003eThe 1.06 A\/R housings provide the broadest general balance between response and turbine-flow capacity for many high-output street and track applications.\u003c\/li\u003e\n\u003cli\u003eThe 1.19 A\/R housings provide the greatest exhaust-flow capacity in the verified G40 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 G40-1250 configuration is listed by Garrett. An appropriately sized external wastegate system is required.\u003c\/li\u003e\n\u003cli\u003eThe G40-1250 supercore is compatible only with the verified standard-rotation G40 housings listed in this description. Reverse-rotation housings are not interchangeable.\u003c\/li\u003e\n\u003cli\u003eG-Series II uses the corresponding first-generation G40 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 plumbing, 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":46282411671609,"sku":null,"price":2713.18,"currency_code":"USD","in_stock":true},{"title":"Supercore + 757707-0027 0.85 V-band Open V-band External (+$862.85)","offer_id":46282460266553,"sku":null,"price":3576.03,"currency_code":"USD","in_stock":true},{"title":"Supercore + 757707-0028 0.95 V-band Open V-band External (+$862.85)","offer_id":46282460299321,"sku":null,"price":3576.03,"currency_code":"USD","in_stock":true},{"title":"Supercore + 757707-0029 1.06 V-band Open V-band External (+$862.85)","offer_id":46282460332089,"sku":null,"price":3576.03,"currency_code":"USD","in_stock":true},{"title":"Supercore + 757707-0030 1.19 V-band Open V-band External (+$862.85)","offer_id":46282460364857,"sku":null,"price":3576.03,"currency_code":"USD","in_stock":true},{"title":"Supercore + 757707-0032 0.85 T4 Divided V-band External (+$1047.75)","offer_id":46282460397625,"sku":null,"price":3760.93,"currency_code":"USD","in_stock":true},{"title":"Supercore + 757707-0033 0.95 T4 Divided V-band External (+$924.49)","offer_id":46282460430393,"sku":null,"price":3637.67,"currency_code":"USD","in_stock":true},{"title":"Supercore + 757707-0034 1.06 T4 Divided V-band External (+$924.49)","offer_id":46282460463161,"sku":null,"price":3637.67,"currency_code":"USD","in_stock":true},{"title":"Supercore + 757707-0035 1.19 T4 Divided V-band External (+$924.49)","offer_id":46282460495929,"sku":null,"price":3637.67,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0809\/8512\/9017\/files\/G40-1250.png?v=1786030805","url":"https:\/\/rad-power.com\/products\/garrett-g-series-ii-g40-1250-71mm-turbocharger","provider":"RAD","version":"1.0","type":"link"}