{"product_id":"kinugawa-turbo-dual-port-adjustable-internal-wastegate-actuator-head-replacement-diaphragm-head-with-spring-options","title":"Kinugawa Turbo Dual Port Adjustable Internal Wastegate Actuator Head — Replacement Diaphragm Head with Spring Options","description":"\u003ch2\u003eKinugawa Turbo Dual Port Adjustable Internal Wastegate Actuator Head — Replacement with Spring Options\u003c\/h2\u003e\n\n\u003cp\u003eThe \u003cstrong\u003eKinugawa Dual Port Adjustable Internal Wastegate Actuator Head\u003c\/strong\u003e is a direct replacement head for Kinugawa turbo adjustable single-port actuators, upgrading them to dual-port operation for more precise, bidirectional boost control. The diaphragm shares the same design as the single-port type and features a \u003cstrong\u003ecopper spacer with oil rings\u003c\/strong\u003e to prevent leakage in the bottom chamber. Note: the displacement rod may still exhibit minor seepage, which is normal for this design.\u003c\/p\u003e\n\n\u003cp\u003eAvailable in \u003cstrong\u003eeight spring pressure ratings from 0.3 bar to 2.0 bar\u003c\/strong\u003e, this replacement head lets you retune your existing actuator for a different boost target without replacing the full assembly. Select your target spring pressure from the variant selector above.\u003c\/p\u003e\n\n\u003ch3\u003eCompatible Application\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003eDirect replacement for Kinugawa turbo adjustable single-port actuator head\u003c\/li\u003e\n  \u003cli\u003eUpgrades single-port actuator to dual-port operation\u003c\/li\u003e\n  \u003cli\u003eCompatible with Kinugawa adjustable internal wastegate actuator assemblies\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eAvailable Spring Pressure Options\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e0.3 bar (4.4 psi)\u003c\/li\u003e\n  \u003cli\u003e0.5 bar (7.4 psi)\u003c\/li\u003e\n  \u003cli\u003e0.8 bar (11.8 psi)\u003c\/li\u003e\n  \u003cli\u003e1.0 bar (14.7 psi)\u003c\/li\u003e\n  \u003cli\u003e1.2 bar (17.6 psi)\u003c\/li\u003e\n  \u003cli\u003e1.5 bar (21.8 psi)\u003c\/li\u003e\n  \u003cli\u003e1.7 bar (24.7 psi)\u003c\/li\u003e\n  \u003cli\u003e2.0 bar (29.0 psi)\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eSingle Port vs. Dual Port — What’s the Difference?\u003c\/h3\u003e\n\n\u003cp\u003e\u003cstrong\u003eSingle Port Actuators\u003c\/strong\u003e\u003cbr\u003e\nBoost reference is supplied to one side of the diaphragm. The wastegate opens in one direction; spring pressure alone handles the return stroke and holds the wastegate closed. Best suited for basic boost control via a manual boost controller (MBC) or electronic boost controller (EBC). Simple plumbing, straightforward setup — ideal for street and mild performance builds.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eDual Port Actuators\u003c\/strong\u003e\u003cbr\u003e\nBoost reference is supplied to both sides of the diaphragm, enabling bidirectional control of the wastegate — both opening and closing. Spring pressure is pneumatically assisted on the return stroke, allowing a softer spring to achieve the same or higher boost targets with greater precision. Recommended for high-boost applications, high exhaust backpressure environments, or oversized wastegates. Best used with an EBC for maximum tunability.\u003c\/p\u003e\n\n\u003cp\u003e\u003cem\u003eTech Tip: Dual port actuator heads can also be run as a traditional single port — simply leave the lower actuator port vented to atmosphere.\u003c\/em\u003e\u003c\/p\u003e\n\n\u003ch3\u003eSpring Pressure Setup \u0026amp; Preload Reference\u003c\/h3\u003e\n\n\u003cp\u003eUse the spring pressure tables below to identify the correct spring for your target boost level and to set the appropriate preload. Spring surface paint is used for color identification only — it does not affect spring function or performance.\u003c\/p\u003e\n\n\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/2614\/6270\/files\/Spring_pressure_01_v2.1.1.png?v=1631110854\" alt=\"Kinugawa Adjustable Actuator Spring Pressure Setup Table 1 — 0.3 to 2.0 Bar Reference Chart\"\u003e\n\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/2614\/6270\/files\/Spring_pressure_02_v2.1.1.png?v=1631110908\" alt=\"Kinugawa Adjustable Actuator Spring Pressure Setup Table 2 — Preload and Displacement Reference\"\u003e\n\n\u003ch3\u003eHow to Replace the Actuator Spring\u003c\/h3\u003e\n\u003cp\u003eWatch the video below to learn how to replace the spring on a Kinugawa adjustable wastegate actuator.\u003c\/p\u003e\n\u003ciframe width=\"560\" height=\"315\" src=\"https:\/\/www.youtube.com\/embed\/ivJ1XsYwvJM?start=4\" title=\"Kinugawa Adjustable Wastegate Actuator — Spring Replacement Guide\" frameborder=\"0\" allowfullscreen\u003e\u003c\/iframe\u003e\n\n\u003ch3\u003eHow to Preload the Actuator Rod for Higher Boost\u003c\/h3\u003e\n\u003cp\u003eYou can preload the actuator rod to achieve a boost pressure higher than the installed spring rating. Follow the step-by-step guides in the videos below.\u003c\/p\u003e\n\u003ciframe width=\"560\" height=\"315\" src=\"https:\/\/www.youtube.com\/embed\/u0d7p_TV0c8?start=55\" title=\"Kinugawa Actuator Rod Preload Setup — Guide 1\" frameborder=\"0\" allowfullscreen\u003e\u003c\/iframe\u003e\n\u003ciframe width=\"560\" height=\"315\" src=\"https:\/\/www.youtube.com\/embed\/p12g1PpIcjE?start=3\" title=\"Kinugawa Actuator Rod Preload Setup — Guide 2\" frameborder=\"0\" allowfullscreen\u003e\u003c\/iframe\u003e\n\n\u003ch3\u003eKit Contents\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e1 × Kinugawa Dual Port Adjustable Wastegate Actuator Head (spring installed per selected variant)\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eProduct Details\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Kinugawa Turbo Systems\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCondition:\u003c\/strong\u003e Brand New\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eType:\u003c\/strong\u003e Dual Port Adjustable Actuator Head (replacement)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSpring Pressure Range:\u003c\/strong\u003e 0.3 bar – 2.0 bar (select variant)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDiaphragm Design:\u003c\/strong\u003e Copper spacer with oil rings (bottom chamber leak prevention)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCountry of Origin:\u003c\/strong\u003e Taiwan\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eHS Code:\u003c\/strong\u003e 841199\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 1 kg\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"KINUGAWA","offers":[{"title":"0.3 Bar","offer_id":43958425321726,"sku":"309-02057-072","price":89.0,"currency_code":"USD","in_stock":true},{"title":"0.5 Bar","offer_id":43958425354494,"sku":"309-02057-073","price":89.0,"currency_code":"USD","in_stock":true},{"title":"0.8 Bar","offer_id":43958425387262,"sku":"309-02057-069","price":89.0,"currency_code":"USD","in_stock":true},{"title":"1.0 Bar (14.7psi)","offer_id":43958425420030,"sku":"309-02057-068","price":89.0,"currency_code":"USD","in_stock":true},{"title":"1.2 Bar","offer_id":43958425452798,"sku":"309-02057-074","price":89.0,"currency_code":"USD","in_stock":true},{"title":"1.5 Bar","offer_id":43958425485566,"sku":"309-02057-070","price":89.0,"currency_code":"USD","in_stock":true},{"title":"1.7 Bar","offer_id":43958425518334,"sku":"309-02057-075","price":89.0,"currency_code":"USD","in_stock":true},{"title":"2.0 Bar","offer_id":43958425551102,"sku":"309-02057-071","price":89.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/2614\/6270\/products\/kinugawa-turbo-dual-port-adjustable-internal-wastegate-actuator-head-replacement-diaphragm-head-with-spring-options-32143518499070.jpg?v=1776647225","url":"https:\/\/store.kinugawaturbosystems.com\/products\/kinugawa-turbo-dual-port-adjustable-internal-wastegate-actuator-head-replacement-diaphragm-head-with-spring-options","provider":"Kinugawa Turbo Systems","version":"1.0","type":"link"}