{"product_id":"isr-performance-thermostat-nissan-vq35hr-vq37vhr-68-degree","title":"ISR Performance Thermostat - Nissan VQ35HR \u0026 VQ37VHR - 68 Degree","description":"\u003cp\u003eThe ISR Performance 68°C Thermostat for the Nissan VQ35HR and VQ37VHR drops the coolant temperature opening point from the factory 78°C to a colder 68°C. Standard cheap-insurance upgrade for hard-driven HR and VHR-equipped 350Z, 370Z, G35, and G37 builds. \u003cstrong\u003eThis is the VQ35HR\/VQ37VHR variant without the water port\u003c\/strong\u003e. the older VQ35DE uses a different thermostat (IS-21200-31U13, with water port).\u003c\/p\u003e\n\n\u003ch3\u003eWhat It Does\u003c\/h3\u003e\n\u003cp\u003eThe factory thermostat opens at 78°C, which is fine for emissions-cycle warm-up but leaves you closer to overheating territory once the engine is making real power. Opening at 68°C means coolant starts flowing through the engine sooner once it warms up, holding lower steady-state temperatures and giving you more margin before the gauge starts climbing. Useful on track days, summer driving, and forced-induction HR\/VHR builds.\u003c\/p\u003e\n\n\u003ch3\u003eFitment\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eNissan VQ35HR and VQ37VHR engines (without water port) only.\u003c\/strong\u003e Will NOT fit the older VQ35DE. that uses the IS-21200-31U13 variant with the water port. Confirm your engine code before ordering. Typical applications: late 350Z HR, 370Z, G35 HR, G37, Q50\/Q60 3.7L.\u003c\/p\u003e\n\n\u003ch3\u003eProduct Details\u003c\/h3\u003e\n\u003cp style=\"margin-bottom: 4px;\"\u003e\u003cstrong\u003eBrand:\u003c\/strong\u003e ISR Performance\u003c\/p\u003e\n\u003cp style=\"margin-bottom: 4px;\"\u003e\u003cstrong\u003ePart Number:\u003c\/strong\u003e IS-21200-31U03\u003c\/p\u003e\n\u003cp style=\"margin-bottom: 4px;\"\u003e\u003cstrong\u003eType:\u003c\/strong\u003e Cooler-temp thermostat\u003c\/p\u003e\n\u003cp style=\"margin-bottom: 4px;\"\u003e\u003cstrong\u003eEngine:\u003c\/strong\u003e Nissan VQ35HR, VQ37VHR (without water port)\u003c\/p\u003e\n\u003cp style=\"margin-bottom: 4px;\"\u003e\u003cstrong\u003eOpening Temperature:\u003c\/strong\u003e 68°C (vs factory 78°C)\u003c\/p\u003e\n\u003cp style=\"margin-bottom: 4px;\"\u003e\u003cstrong\u003eExcluded:\u003c\/strong\u003e VQ35DE (use IS-21200-31U13)\u003c\/p\u003e\n\u003cp style=\"margin-bottom: 4px;\"\u003e\u003cstrong\u003eTypical Applications:\u003c\/strong\u003e 350Z HR, 370Z, G35 HR, G37, Q50\/Q60 3.7L\u003c\/p\u003e\n\u003cp style=\"margin-bottom: 4px;\"\u003e\u003cstrong\u003eApplication:\u003c\/strong\u003e High-performance HR\/VHR builds, track use\u003c\/p\u003e\n\u003cp style=\"margin-bottom: 4px;\"\u003e\u003cstrong\u003eSold:\u003c\/strong\u003e Individually\u003c\/p\u003e\n\u003cp style=\"margin-bottom: 4px;\"\u003e\u003cstrong\u003eLegality:\u003c\/strong\u003e Off-road and competition use only\u003c\/p\u003e","brand":"ISR Performance","offers":[{"title":"Default Title","offer_id":45957112955077,"sku":"IS-21200-31U03","price":60.5,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0767\/2718\/9701\/files\/P1170345__68934.1611608423.1280.1280__51111.1630073088.500.659.jpg?v=1773346903","url":"https:\/\/www.isrcompetition.com\/products\/isr-performance-thermostat-nissan-vq35hr-vq37vhr-68-degree","provider":"ISR Competition","version":"1.0","type":"link"}