{"product_id":"radium-engineering-direct-mount-fuel-pulse-damper-kits-20-0176","title":"Radium Engineering Direct Mount Fuel Pulse Damper Kits (20-0176)","description":"\u003cp\u003e\u003cstrong\u003eThose lean AFR spikes your tuner can't tune out might not be a tuning problem at all.\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eEvery injector opening and closing event sends a pressure pulse through the fuel rail, and with high-flow injectors those oscillations add up to unstable rail pressure, idle surge, and stumbles that show up as random lean spikes on the wideband. The \u003cstrong\u003eRadium Engineering Direct Mount Fuel Pulse Damper Kit\u003c\/strong\u003e threads into an 8AN ORB or 3\/8\" NPT port on your rail and uses an internal diaphragm to absorb those pulses, with a vacuum\/boost reference port that keeps the damper working correctly at elevated fuel pressures. Available as the FPD-R (40-70 psi base pressure) or FPD-XR (40-105 psi base pressure). Stable rail pressure across the whole RPM range, measured, not marketed.\u003c\/p\u003e\n\u003ch3\u003eWhat You'll Feel\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eA smoother idle, especially on big injectors that used to surge\u003c\/li\u003e\n\u003cli\u003eLean stumbles disappearing from spots in the RPM range no tune could fix\u003c\/li\u003e\n\u003cli\u003eA cleaner, more consistent AFR trace on the wideband from tip-in to redline\u003c\/li\u003e\n\u003cli\u003eFreedom to mount it at any angle, even upside down, wherever the rail allows\u003c\/li\u003e\n\u003cli\u003eOne less variable to chase during dyno sessions\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eFeatures\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eInternal diaphragm absorbs injector pressure pulses and stabilizes rail pressure\u003c\/li\u003e\n\u003cli\u003eVacuum\/boost reference port maintains damping at elevated pressures, essential with 1:1 rising-rate regulators\u003c\/li\u003e\n\u003cli\u003eFPD-R: 40-70 psi base static pressure range; FPD-XR: 40-105 psi base static pressure range\u003c\/li\u003e\n\u003cli\u003e8AN ORB versions (20-0776 FPD-R, 20-0777 FPD-XR) seal with an FKM O-ring and swivel 360 degrees after tightening to clock the vacuum port\u003c\/li\u003e\n\u003cli\u003e3\/8\" NPT versions (20-0178 FPD-R, 20-0179 FPD-XR) seal on tapered threads and clock during tightening\u003c\/li\u003e\n\u003cli\u003eSafe for all fuel types including alcohol blends such as E85\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eThe Details\u003c\/h3\u003e\n\u003cp\u003eBase static pressure is what your gauge reads with the pump running and no vacuum line on the regulator, and it determines which damper you need. If your base pressure sits between 40 and 70 psi, the FPD-R covers you; between 70 and 105 psi, step up to the FPD-XR. Dynamic pressure from a rising-rate regulator can swing outside those ranges and the damper still works, as long as base pressure was set within range and the vacuum\/boost reference line is connected. That reference port is what separates Radium's design from OEM-style dampers, which fall out of their working range as boost drives rail pressure up. For best results mount the damper directly on the fuel rail, though some systems also benefit from one on the return line. Two hard limits: these dampers cannot be used with mechanical fuel pumps or on the high-pressure side of direct injection systems, because those pressure pulses will rupture the diaphragm. For a 6AN ORB port, Radium's 14-0600 adapter (sold separately) adapts either 8AN ORB damper.\u003c\/p\u003e\n\u003ch3\u003eKit Includes\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e1x Anodized, laser engraved aluminum top (R or XR)\u003c\/li\u003e\n\u003cli\u003e1x Anodized aluminum body with male threads (8AN ORB or 3\/8\" NPT per selection)\u003c\/li\u003e\n\u003cli\u003eStainless steel hardware\u003c\/li\u003e\n\u003cli\u003eRubber vacuum hose, 4mm ID\u003c\/li\u003e\n\u003cli\u003e1x Vacuum hose Y-fitting\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eApplications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eUniversal: any fuel rail or fitting with an 8AN ORB or 3\/8\" NPT female port\u003c\/li\u003e\n\u003cli\u003e6AN ORB ports supported with optional 14-0600 adapter (sold separately)\u003c\/li\u003e\n\u003cli\u003ePort fuel injection systems only; not compatible with mechanical fuel pumps or direct injection high-pressure circuits\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Radium Engineering","offers":[{"title":"FPD-R (40 - 70psi)","offer_id":43672688033859,"sku":"20-0178","price":85.45,"currency_code":"USD","in_stock":true},{"title":"FPD-XR (43 - 78psi)","offer_id":43672688099395,"sku":"20-0777","price":94.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0064\/7754\/5539\/files\/radium-engineering-32046408466502_376a806f-8a9d-43c8-86b3-24e53a9e6f3c.jpg?v=1786717045","url":"https:\/\/www.tunedbyshawn.com\/products\/radium-engineering-direct-mount-fuel-pulse-damper-kits-20-0176","provider":"Tuned by Shawn","version":"1.0","type":"link"}