{"product_id":"gfb-t9235-hybrid-tms-bov-1997-1998-subaru-wrx-sti-35mm-inlet","title":"GFB HYBRID TMS Dual Port 35mm Inlet\/30mm Outlet 97-98 Subaru WRX\/STi","description":"\u003ch4\u003eGFB's Original Dual Port Design Returns for the 1997-1998 Subaru WRX and STi with Full Vent, Full Recirc, or 50\/50 Configuration\u003c\/h4\u003e\n\u003cp\u003eThe GFB T9235 Hybrid TMS is a direct factory replacement blow-off valve for the 1997-1998 Subaru WRX and STi, designed as a drop-in unit that bolts to the same location as the OEM diverter valve without modification. GFB pioneered the dual port blow-off design with the original Hybrid in 1999, and the GFBT9235 carries that technology forward with a configurable outlet system that lets you choose full recirculation for a quiet and stock-like operation, full atmosphere vent for maximum blow-off sound, or a 50\/50 split for a middle ground. The staged venting design opens the recirc port first at low valve lift, then progressively exposes the atmosphere port as boost pressure rises, giving a proportional and tunable response that protects the MAF sensor circuit on factory-tuned applications.\u003c\/p\u003e\n\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003eDirect factory replacement for the OEM blow-off valve on 1997-1998 Subaru WRX and STi; no modifications required\u003c\/li\u003e\n\u003cli\u003eDual port staged venting: recirc port opens first at low lift, atmosphere port opens progressively at higher lift\u003c\/li\u003e\n\u003cli\u003eConfigurable for full recirculation, full atmosphere venting, or 50\/50 venting using included blanking plugs\u003c\/li\u003e\n\u003cli\u003e35mm inlet (fits 32-35mm ID hose or 25.4mm OD metal pipe); 30mm recirculation outlet\u003c\/li\u003e\n\u003cli\u003eAdjustable spring preload screw for tuning valve opening sensitivity to match boost level and driver preference\u003c\/li\u003e\n\u003cli\u003eTMS (Turbo Management System) technology ensures rapid boost recovery after a gear change\u003c\/li\u003e\n\u003cli\u003eRated to hold boost pressures exceeding 100 psi; suitable for modified high-boost applications\u003c\/li\u003e\n\u003cli\u003eIncludes blanking plugs for full recirc or full atmosphere configuration\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch4\u003eVehicle Fitment\u003c\/h4\u003e\n\u003ctable\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eYear Range\u003c\/th\u003e\n\u003cth\u003eMake\u003c\/th\u003e\n\u003cth\u003eModel\u003c\/th\u003e\n\u003cth\u003eTrim\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e1997-1998\u003c\/td\u003e\n\u003ctd\u003eSubaru\u003c\/td\u003e\n\u003ctd\u003eWRX\u003c\/td\u003e\n\u003ctd\u003eDirect OEM replacement\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e1997-1998\u003c\/td\u003e\n\u003ctd\u003eSubaru\u003c\/td\u003e\n\u003ctd\u003eWRX STi\u003c\/td\u003e\n\u003ctd\u003eDirect OEM replacement\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch4\u003eSpecifications\u003c\/h4\u003e\n\u003ctable\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eDetail\u003c\/th\u003e\n\u003cth\u003eValue\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003ePart Number\u003c\/td\u003e\n\u003ctd\u003eT9235\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eValve Type\u003c\/td\u003e\n\u003ctd\u003eHybrid TMS Dual Port Blow Off Valve\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInlet Diameter\u003c\/td\u003e\n\u003ctd\u003e35mm (fits 32-35mm ID hose or 25.4mm OD metal pipe)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRecirculation Outlet\u003c\/td\u003e\n\u003ctd\u003e30mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eVenting Configuration\u003c\/td\u003e\n\u003ctd\u003eFull recirc, Full atmosphere, or 50\/50 (user selectable)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSpring Preload\u003c\/td\u003e\n\u003ctd\u003eAdjustable via external screw (included hex key)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBoost Pressure Rating\u003c\/td\u003e\n\u003ctd\u003e100 psi and above\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eVacuum Connection\u003c\/td\u003e\n\u003ctd\u003e4mm ID vacuum nipple, manifold vacuum source required\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTechnology\u003c\/td\u003e\n\u003ctd\u003eGFB TMS (Turbo Management System)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eStaged Venting\u003c\/td\u003e\n\u003ctd\u003eYes, proportional to valve lift\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHardware Included\u003c\/td\u003e\n\u003ctd\u003eBlanking plugs, hex key, grub screws with lock nuts\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eUPC\u003c\/td\u003e\n\u003ctd\u003e9327256009271\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch4\u003eWhat's Included\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003e1x GFB T9235 Hybrid TMS dual port blow-off valve\u003c\/li\u003e\n\u003cli\u003eRecirculation outlet hose plug (for full atmosphere configuration)\u003c\/li\u003e\n\u003cli\u003eAtmosphere port blanking plug (for full recirc configuration)\u003c\/li\u003e\n\u003cli\u003eGrub screws with lock nuts for pipe mounting\u003c\/li\u003e\n\u003cli\u003e5mm hex key for spring preload adjustment\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch4\u003eAbout Go Fast Bits\u003c\/h4\u003e\n\u003cp\u003eGo Fast Bits (GFB) is an Australian performance engineering company that invented the dual port blow-off valve design in 1999 with the original Hybrid. Since then, GFB has been a leading manufacturer of blow-off valves and diverter valves for turbocharged vehicles worldwide. Every GFB valve is engineered to solve real-world issues with factory valves on modified and stock turbo cars, and is rated to withstand boost pressures beyond what any street or track turbo application can produce.\u003c\/p\u003e\n\n\u003ch4\u003eFrequently Asked Questions\u003c\/h4\u003e\n\u003cstrong\u003eWhat is the GFB T9235?\u003c\/strong\u003e\n\u003cp\u003eThe GFB T9235 is a Hybrid TMS dual port blow-off valve designed as a direct factory replacement for the 1997-1998 Subaru WRX and STi. It uses a staged dual-outlet design that vents to recirculation first and progressively exposes the atmosphere outlet as boost pressure rises, providing a configurable sound profile from silent full recirc to full atmosphere venting.\u003c\/p\u003e\n\n\u003cstrong\u003eIs the GFBT9235 a direct bolt-on for the 1997-1998 WRX?\u003c\/strong\u003e\n\u003cp\u003eYes. The T9235 is designed as a direct factory replacement for the OEM blow-off valve on the 1997-1998 Subaru WRX and STi. It mounts in the same location using the factory hose connections with no cutting, welding, or fabrication required.\u003c\/p\u003e\n\n\u003cstrong\u003eHow do I configure the T9235 for full atmosphere venting?\u003c\/strong\u003e\n\u003cp\u003eTo run full atmosphere venting, disconnect the recirculation hose and block it with the supplied hose plug. Install the screw-in plug in place of the recirculation outlet on the valve body. This routes 100 percent of the vented air to the atmosphere outlet for maximum blow-off sound.\u003c\/p\u003e\n\n\u003cstrong\u003eHow do I configure the T9235 for full recirculation?\u003c\/strong\u003e\n\u003cp\u003eTo run full silent recirculation, keep the recirculation hose connected to the recirc outlet and swap the atmosphere trumpet for the threaded blanking plug. All vented air is returned to the intake tract upstream of the turbo, resulting in a quiet, stock-like operation with no atmospheric venting.\u003c\/p\u003e\n\n\u003cstrong\u003eWill the T9235 cause the engine to stall or stumble on a MAF-equipped WRX?\u003c\/strong\u003e\n\u003cp\u003eThe dual port design minimizes stalling risk by staging the atmosphere vent to open proportionally rather than all at once. When set to full recirculation or 50\/50, the T9235 is safe for MAF-equipped applications. For full atmosphere configuration, adjust the spring preload to the appropriate setting per the included instructions to prevent idle drop after a hard gear change.\u003c\/p\u003e\n\n\u003cstrong\u003eWhat vehicles besides the 1997-1998 WRX fit the T9235?\u003c\/strong\u003e\n\u003cp\u003eThe T9235 also fits the Nissan 300ZX Z32 (two valves required), Nissan Silvia\/200SX S13 with SR20DET engine, and Nissan Pulsar GTi-R N14 (requires a softer spring, GFB part 6116, sold separately). For custom installations on other vehicles, the T9235 can be used with a 32-35mm ID hose or welded onto a 25.4mm OD pipe.\u003c\/p\u003e\n\n\u003cstrong\u003eHow do I adjust the spring preload on the T9235?\u003c\/strong\u003e\n\u003cp\u003eUse the supplied 5mm hex key to turn the preload adjustment screw. Turn toward the plus sign to increase spring tension, which raises the boost pressure required to open the valve. Turn toward the minus sign to decrease tension. GFB recommends starting at the softest setting and firming up by one turn at a time until the engine returns smoothly to idle after a hard throttle lift-off.\u003c\/p\u003e\n\n\u003cstrong\u003eWhat maintenance does the GFB T9235 require?\u003c\/strong\u003e\n\u003cp\u003ePeriodic cleaning is recommended. Remove the four cap screws to access the piston, then wipe the piston and bore with a clean rag and apply a light coat of engine oil to the piston and the inside of the bore before reassembling. No other scheduled maintenance is required under normal operating conditions.\u003c\/p\u003e\n\n\u003ch4\u003eInstallation Instructions\u003c\/h4\u003e\n\u003col\u003e\n\u003cli\u003eRemove the factory OEM blow-off valve from the turbo piping on the 1997-1998 Subaru WRX or STi.\u003c\/li\u003e\n\u003cli\u003eConnect the T9235 base to the factory inlet hose and secure with a hose clamp seated on the straight section of the fitting, not on the retaining bead.\u003c\/li\u003e\n\u003cli\u003eConnect the recirculation outlet to the factory recirc hose with a hose clamp.\u003c\/li\u003e\n\u003cli\u003eConnect the 4mm vacuum line to the T9235 vacuum nipple. Run the line to a manifold vacuum source located after the throttle body. Keep the line as short as possible.\u003c\/li\u003e\n\u003cli\u003eDo not connect the vacuum line to boost control, fuel pressure regulator, or brake booster lines.\u003c\/li\u003e\n\u003cli\u003eSet the spring preload adjustment screw to the softest position (3mm above the head of the valve cap).\u003c\/li\u003e\n\u003cli\u003eStart the engine and let it idle for two minutes with the A\/C off. Confirm the piston is fully closed at idle. If the piston is hovering open, tighten the spring in the plus direction until it closes.\u003c\/li\u003e\n\u003cli\u003eStab the throttle and release quickly. The piston should lift and vent, then close smoothly. If the engine stumbles, tighten the spring one turn at a time until idle recovery is smooth.\u003c\/li\u003e\n\u003cli\u003eTake the car for a drive. If the revs dip below idle when stopping quickly from boost, tighten the spring 1-2 turns. If fluttering occurs at low RPM, loosen the spring one turn at a time.\u003c\/li\u003e\n\u003cli\u003eConfigure atmosphere\/recirc plugs for desired sound level per the included instruction sheet.\u003c\/li\u003e\n\u003c\/ol\u003e","brand":"Go Fast Bits","offers":[{"title":"Default Title","offer_id":46053665964111,"sku":"GFBT9235","price":219.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1062\/7920\/files\/GFB_Hybrid_TMS_BOV_1997-1998_Subaru_WRX_STi_35mm_Inlet.png?v=1784057410","url":"https:\/\/www.blackopsautoworks.com\/products\/gfb-t9235-hybrid-tms-bov-1997-1998-subaru-wrx-sti-35mm-inlet","provider":"Black Ops Auto Works","version":"1.0","type":"link"}