{"product_id":"hks-hipermax-s-rv37-400r-1","title":"HKS 80330-AN017 Hipermax S Coilover Kit Nissan Skyline 400R RV37 Infiniti Q50 V3","description":"\u003ch4\u003eVehicle Fitment\u003c\/h4\u003e\u003cul\u003e \u003cli\u003e2019-Present Nissan Skyline 400R (RV37; VR30DDTT Twin Turbo 3.0L V6; RWD) - Full Kit (Front \u0026amp; Rear)\u003c\/li\u003e \u003cli\u003e2019-Present Infiniti Q50 (V37; VR30DDTT Twin Turbo 3.0L V6; RWD) - Full Kit (Front \u0026amp; Rear)\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eFitment Notes\u003c\/h4\u003e\u003cul\u003e \u003cli\u003eProduction date range: September 2019 (19\/09) onward - covers RV37 production to date\u003c\/li\u003e \u003cli\u003eFits RWD (rear-wheel drive) variants only; AWD (4WD) Q50 \/ Skyline models are not compatible\u003c\/li\u003e \u003cli\u003eNissan Skyline 20GT-T (lower-spec trim with detuned VR30DDTT): not confirmed compatible as of August 2024 - verify before ordering\u003c\/li\u003e \u003cli\u003eDamping force adjustment is wire-accessible on both front and rear dampers\u003c\/li\u003e \u003cli\u003eThis item ships via UPS or FedEx only - standard ground freight is not available\u003c\/li\u003e \u003cli\u003eSold as a complete front and rear coilover kit (4 corners)\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eFeatures\u003c\/h4\u003e\u003cul\u003e \u003cli\u003eSingle-tube (monotube) damper construction separates gas and oil chambers for stable, heat-resistant damping under sustained cornering load\u003c\/li\u003e \u003cli\u003eHKS Flat Ride Concept (FRC) tuning minimizes low-speed harshness while keeping the RV37 planted and controlled under hard driving\u003c\/li\u003e \u003cli\u003e30-step damping adjustment via Wide Range (WR) Needle - tunable from street to performance without disassembly, accessible via wire on both axles\u003c\/li\u003e \u003cli\u003eDual Preload Valve System (Dual PVS) reduces unnecessary high-speed damping force for improved ride comfort without sacrificing sport performance\u003c\/li\u003e \u003cli\u003eFront and rear helper springs (19.8 N\/mm) prevent spring float at full droop and improve damper packing behavior\u003c\/li\u003e \u003cli\u003eLength-adjustable shock body allows ride height reduction without spring preload, preserving full suspension travel\u003c\/li\u003e \u003cli\u003ePNE corrosion coating on threaded surfaces provides 5x the durability of standard galvanizing\u003c\/li\u003e \u003cli\u003eManufactured in Japan to HKS specifications; 3-year \/ 60,000 km warranty coverage\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eSpecifications\u003c\/h4\u003e\u003cul\u003e \u003cli\u003eHKS Part Number: 80330-AN017 (supersedes 80300-AN017)\u003c\/li\u003e \u003cli\u003eCompatible Vehicles: Nissan Skyline 400R (RV37), Infiniti Q50 (V37; RWD)\u003c\/li\u003e \u003cli\u003eCompatible Engine: VR30DDTT (3.0L Twin Turbo V6)\u003c\/li\u003e \u003cli\u003eSpring Rate - Front: 138 N\/mm (14 kgf\/mm)\u003c\/li\u003e \u003cli\u003eSpring Rate - Rear: 78 N\/mm (8 kgf\/mm)\u003c\/li\u003e \u003cli\u003eFree Length - Front: 200 mm (Straight)\u003c\/li\u003e \u003cli\u003eFree Length - Rear: 250 mm (Straight)\u003c\/li\u003e \u003cli\u003eRecommended Spring Rate Change Range - Front\/Rear: ±19 N\/mm (±2 kgf\/mm)\u003c\/li\u003e \u003cli\u003eDamping Force Adjustment: 30 steps (Front \u0026amp; Rear, wire-adjustable)\u003c\/li\u003e \u003cli\u003eHelper Spring (Front \u0026amp; Rear): 19.8 N\/mm\u003c\/li\u003e \u003cli\u003eUpper Mount - Front: Rubber\u003c\/li\u003e \u003cli\u003eUpper Mount - Rear: Rubber\u003c\/li\u003e \u003cli\u003eDamper Layout: Normal (Front \u0026amp; Rear)\u003c\/li\u003e \u003cli\u003eRide Height at Shipment - Front: -19 mm (adjustable range: 0 to -45 mm; drivable range: 0 to -37 mm)\u003c\/li\u003e \u003cli\u003eRide Height at Shipment - Rear: -34 mm (adjustable range: 0 to -69 mm; drivable range: -15 to -58 mm)\u003c\/li\u003e \u003cli\u003eCountry of Origin: Japan\u003c\/li\u003e \u003cli\u003eWarranty: 3 Years \/ 60,000 km\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eIncluded Components\u003c\/h4\u003e\u003cul\u003e \u003cli\u003e2x Front HKS Hipermax S Coilover Assemblies with Rubber Upper Mounts (Left \u0026amp; Right)\u003c\/li\u003e \u003cli\u003e2x Rear HKS Hipermax S Coilover Assemblies with Rubber Upper Mounts (Left \u0026amp; Right)\u003c\/li\u003e \u003cli\u003eFront and rear helper springs (19.8 N\/mm)\u003c\/li\u003e \u003cli\u003eHardware and adjustment tools as supplied by HKS\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eProduct Description\u003c\/h4\u003e\u003cp\u003e The HKS 80330-AN017 Hipermax S is a complete front and rear coilover kit engineered for the 2019-and-later Nissan Skyline 400R (RV37) and its Infiniti Q50 RWD counterpart, both equipped with the VR30DDTT 3.0L twin turbo V6. Built on HKS's monotube damper platform, this kit features a notably asymmetric spring rate pairing - a firm 138 N\/mm front to manage the VR30DDTT's front weight bias and nose-heavy sedan dynamics, combined with a softer 78 N\/mm rear to retain compliance and rear traction. Both axles benefit from 19.8 N\/mm helper springs to maintain damper contact through the full travel range and avoid spring float at low-speed road irregularities.\u003c\/p\u003e\u003cp\u003e Ride height at shipment is set to -19 mm front and -34 mm rear from factory ride height, with front adjustment up to -45 mm and rear adjustment up to -69 mm within the full adjustable range. Dual wire-accessible damping adjustment dials allow 30-step front and rear tuning without removing wheels, making in-field setup changes straightforward on track days or canyon drives. Note that AWD variants and the 20GT-T trim have not been confirmed compatible. This kit supersedes part number 80300-AN017, ships via UPS or FedEx only, and is covered by HKS's 3-year \/ 60,000 km manufacturer warranty.\u003c\/p\u003e\u003cmeta name=\"description\" content=\"Upgrade your Nissan Skyline 400R or Infiniti Q50 with the HKS Hipermax S Coilover Kit. Enjoy adjustable damping and enhanced performance!\"\u003e\u003cmeta name=\"keywords\" content=\"HKS coilover kit, Nissan Skyline 400R suspension, Infiniti Q50 performance parts, monotube damper system, adjustable ride height kit, VR30DDTT twin turbo suspension, rear-wheel drive coilover assembly, automotive dampening technology, performance suspension tuning, HKS Hipermax S features\"\u003e","brand":"HKS","offers":[{"title":"Default Title","offer_id":53856571785535,"sku":"HKS80330-AN017","price":2180.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0832\/7308\/9343\/files\/c213b645958a1ff963f8418ba3981c00L.jpg?v=1786584123","url":"https:\/\/wcaperformance.com\/products\/hks-hipermax-s-rv37-400r-1","provider":"WCA Performance","version":"1.0","type":"link"}