{"product_id":"gfb-lightweight-underdrive-crank-pulley-nissan-silvia-180sx-s13-200sx-s14-s15-sr20det-2005","title":"GFB Lightweight Underdrive Crank Pulley Nissan Silvia, 180SX S13\/200SX S14, S15 (SR20DET)","description":"\u003ch2\u003eLightweight Underdrive Crank Pulley Nissan Silvia, 180SX S13\/200SX S14, S15 (SR20DET) | GFB 2005\u003c\/h2\u003e\n\u003ch3\u003ePurpose-Built Underdrive Pulley Upgrade\u003c\/h3\u003e\n\u003cp\u003eUpgrade the specific function of your turbocharged setup with the \u003cstrong\u003eGFB 2005\u003c\/strong\u003e. This lightweight underdrive crank pulley is selected for its defined mechanical job: replacing the original crank pulley with a lightweight underdrive design can reduce the rotational mass and change the drive ratio of belt-driven accessories. The appeal is crisper engine response rather than a guaranteed horsepower figure.\u003c\/p\u003e\n\u003ch3\u003eHow It Works \u0026amp; Why It Matters\u003c\/h3\u003e\n\u003cp\u003eThe accessory drive transfers crankshaft rotation to belt-driven equipment. Changes to pulley mass and drive ratio can influence how the engine responds, but they must be considered alongside accessory speed and belt compatibility.\u003c\/p\u003e\n\u003cp\u003eReplacing the original crank pulley with a lightweight underdrive design can reduce the rotational mass and change the drive ratio of belt-driven accessories. The appeal is crisper engine response rather than a guaranteed horsepower figure.\u003c\/p\u003e\n\u003cp\u003eThe benefit is predictable operation in the conditions for which the component was designed, rather than an unsupported blanket horsepower claim. Correct plumbing, calibration and the condition of associated hardware remain essential to achieving the intended response.\u003c\/p\u003e\n\u003ch3\u003eKey Features \u0026amp; Benefits\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eReduced rotational mass:\u003c\/strong\u003e Targets the exact pressure, fitment or actuation requirement for this component.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUnderdrive accessory drive ratio:\u003c\/strong\u003e Supports an appropriate installation without generic, one-size-fits-all claims.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSR20DET-focused application:\u003c\/strong\u003e Helps maintain controlled operation when paired with compatible supporting hardware.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePerformance-oriented pulley upgrade:\u003c\/strong\u003e Relevant to servicing, tuning or building the specified turbo system.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eVehicle Fitment \/ Compatibility\u003c\/h3\u003e\n\u003cp\u003eNissan Silvia, 180SX S13\/200SX S14, S15 (SR20DET)\u003c\/p\u003e\n\u003cp\u003eIf you are unsure about compatibility, please contact the Symmetry Spec team at \u003cstrong\u003eteam@symmetryspec.com.au\u003c\/strong\u003e for clarification before ordering.\u003c\/p\u003e\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e GFB (Go Fast Bits)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart Number:\u003c\/strong\u003e 2005\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Category:\u003c\/strong\u003e Underdrive Pulley Upgrade\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePrimary Function:\u003c\/strong\u003e Lightweight underdrive crank pulley\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eInstallation Considerations\u003c\/h3\u003e\n\u003cp\u003eConfirm belt length, accessory drive arrangement and harmonic damper requirements before fitting. Confirm your application-specific mounting hardware and associated settings prior to fitting.\u003c\/p\u003e\n\u003ch3\u003ePrecision Turbo Components at Symmetry Spec\u003c\/h3\u003e\u003cp\u003eChoose the \u003cstrong\u003eGFB 2005\u003c\/strong\u003e when you need lightweight underdrive crank pulley suited to the installation at hand. Order through \u003cstrong\u003eSymmetry Spec\u003c\/strong\u003e for a focused performance component solution and support when checking compatibility.\u003c\/p\u003e","brand":"GFB","offers":[{"title":"Default Title","offer_id":67961854525728,"sku":"2005","price":269.1,"currency_code":"AUD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1004\/5820\/1376\/files\/02-18.jpg?v=1792886660","url":"https:\/\/symmetryspec.com.au\/products\/gfb-lightweight-underdrive-crank-pulley-nissan-silvia-180sx-s13-200sx-s14-s15-sr20det-2005","provider":"Symmetry Spec","version":"1.0","type":"link"}