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	Blowoff valve - Wikipedia, the free encyclopedia
		The term "blowoff valve" is commonly used in the disussion of turbocharged vehicles.
		Some blowoff valves are marketed with trumpet shaped exits that amplify the "psshh" sound went the person driving the car shifts gears.
		When the throttle is closed, underpressure develops in the intake manifold after the throttle plate and "sucks" the blowoff valve open.
	en.wikipedia.org /wiki/Blowoff_valve (692 words)

	Blow Down Valves
		The outlet of valves is purposely "Venturi tube" shaped; stem is rising non rotating; a local stroke indicator shows the position of the disk.
		A standard blowdown or blowoff valve does not assure a tight sealing after some operating period: this is due to the normal erosion made by fluid between seat and disk; in case tight seal is needed, this function was performed in the past by a second valve.
		It is a "multistage" valve splitting the pressure drop along the whole disk that is along the different stages of the disk.
	www.cesare-bonetti.it /Products/Valves/blowdown.htm (586 words)

	Relief valve - Wikipedia, the free encyclopedia
		The relief valve is a type of valve used to control or limit the pressure in a system by allowing the pressure source fluid to flow from an auxiliary passage, away from the main flow path.
		The relief valve is designed or set to open at a predetermined pressure to protect pressure vessels and other equipment from being subjected to pressures that exceed their design limits.
		When the pressure setting is exceeded, the relief valve becomes the "path of least resistance" as the valve is forced open and a portion of the fluid is diverted through the auxiliary route.
	en.wikipedia.org /wiki/Relief_valve (468 words)

	HKS Super Sequential Blowoff Valve (SSQV) Kit Subaru Impreza WRX STI 2004 Turbo
		The Super Sequential Blowoff Valve (SSQV) releases excess boost when there is a pressure alteration in its chambers, not by the rate of boost pressure or vacuum in the line.
		These large valves react slowly and require high pressure to open, and are not able to activate and prevent compressor surge at light-load conditions.
		The HKS Super Sequential Blowoff Valve (SSQV) is engineered to initially open the small primary valve at light throttle and load conditions, then sequentially opens the secondary valve for additional relief capacity under high boost and load conditions.
	www.raceinspired.com /p-700-hks-super-sequential-blowoff-valve-ssqv-kit-subaru-impreza-wrx-sti-2004-turbo.aspx (691 words)

	Enjoy The Drive -- Wastegates & Blowoff Valves (Site not responding. Last check: 2007-09-10)
		There's a vacuum in the intake manifold, and it uses that vacuum to open the blowoff valve to let the pressure out of the pipe, so the turbo keeps on spooling.
		Usually, a factory blowoff valve is set for stock boost.
		GReddy offers two sizes of blowoff valves, each with a spring stiffness adjustment screw, as well as four sizes of external wastegates with various spring rates.
	www.enjoythedrive.com /content/?id=22417 (532 words)

	Extreme 280zxt page (Site not responding. Last check: 2007-09-10)
		The blowoff valve is important in a high performance application as it will stop turbo back spin and keep the turbo spinning for quicker spool up.
		The valve must be able to effectively bleed off the air in the intake under boost when the throttle is let off.
		A note on the HKS blowoff valve: The standard spring in the HKS valve shown on my page has a spring pressure of about 15 psi to actuate the valve.
	www.angelfire.com /extreme/280zxt/page4.html (443 words)

	www.TurboImport.com - High Performance Parts!
		However, these large valves tend to react slowly and require high activation pressure to open, therefore are not able to activate and prevent compressor surge at light-load conditions.
		The SSQV is engineered to initially open the small primary valve at light throttle and load conditions, then sequentially opens the secondary valve for additional relief capacity under high boost and load conditions.
		Valve reaction is adjusted by tightening or loosening the spring tensioning screw on top of the unit.
	www.turboimport.com /catalog/blowoff.htm (1156 words)

	HKS Blow Off Valve
		HKS Blow Off Valve Racing HKS Standard and Racing Bypass valves are push type valves that utilize calibrated spring pressure and vacuum line pressure to remain closed against the pressurized air in the charge pipe.
		Similar to the construction and function as the HKS SSQV, the Racing Blowoff Valve Type II uses a large single stage aluminum pull type valve to handle the extreme amounts pressure and airflow discharge volume that is associated with high boost / horsepower applications.
		HKS Blow Off Valve Standard HKS Standard Bypass valves are push type valves that utilize calibrated spring pressure and vacuum line pressure to remain closed against the pressurized air in the charge pipe.
	www.horsepowerfreaks.com /buy/HKS/Blow_Off_Valves/Blow_Off_Valve (436 words)

	The Miata blowoff valve with replacing miata power mast and miata blowoff valve (Site not responding. Last check: 2007-09-10)
		The Miata blowoff valve with replacing miata power mast and miata blowoff valve
		Miata blowoff valve and the replacing miata power mast
		Mazda miata body kits miata turbo kits used mazda miata titanium special edition miata egr valve miata aftermarket, bosch spark plug miata miata fender mazda miata 1993 top drift miata.
	miata-blowoff-valve.aubek.com (971 words)

	HKS SSQV Blow-Off Valve Kits Mazda RX7
		The Sequential Blowoff valve SSQV is engineered to initially open the small primary valve at light throttle and load conditions, then sequentially opens the secondary valve for additional relief capacity under high boost and load conditions.
		The Sequential Blowoff valve SSQV is constructed of polished billet aluminum, which ensures long-term durability and visual appeal.
		The Sequential Blowoff valve HKS SSQV is available as a universal unit for custom applications and also by vehicle specific kits for bolt-on applications.
	www.modacar.com /products/Mazda/RX7/HSBOV (449 words)

	blowoff diverter bypass
		A blowoff valve is different from a bypass valve or diverter valve.
		The main difference between different bypass valves is the amount of force it takes to depress the spring that reroutes the boost pressure back to the intake.
		i saw the OE bypass valve that was for the newer cars with a 14.4lb limit, which was being sold as an upgrade to the older a4 bypass valves...
	www.audiforums.com /m_8933/tm.htm (984 words)

	Blowoff Valve - eBaum's World Forum (Site not responding. Last check: 2007-09-10)
		Basically if you let off the gas while in boost or shift during boost in a manual trans car, the throttle blades in your throttle body close, which leaves the excess boost pressure no where to go except back through the compressor wheel(inlet side of turbo) which puts pressure on the turbine wheel...
		The purpose of a blow off valve is to reduce the amount of back pressure applied to your engine.
		Valves, springs, and retainers are a MUST, as well as cam gears and some sort of fuel management to run it.
	forum.ebaumsworld.com /showthread.php?t=7471 (1312 words)

	Blow Off Valves (Site not responding. Last check: 2007-09-10)
		The primary function of any blow-off valve is to prevent compressor surge by relieving the compressed airflow that reverses direction as the throttle is closed.
		The Megan racing blow-off valve relieves the pressurized air that is normally forced backwards into the compressor by venting it to the atmosphere.
		The highest quality valve we've seen, this unit is a CNC machined all-aluminum blow off valve designed to flat out work and hold all the boost you ask and then some.
	www.prostreetonline.com /store/turbos/blow_off_valves (1135 words)

	NA BLOW OFF SOUND GENERATOR
		The sound from the NA Blow Off Valve can be adjusted to be the same as a turbo blow off valve.
		The NA Blow Off Valve is able to imitate very closely by generating a similar sound.
		As for the NA Blow Off Valve, the sound is generated from a loudspeaker by playing with the frequency of the sound.
	www.takakaira.com /accessories/nightpager/nightpager.html (821 words)

	Blowoff valve - Car Forums and Automotive Chat
		Can you have a blowoff valve with out a turbo.
		11-10-2005, 07:34 PM Can you have a blowoff valve with out a turbo.You already do in a way...Your PCV valve is sometime referred to as the blow-by valve because the PCV system scavenges the gases that "blow by" the piston rings and end up in the crankcase.
		11-14-2005, 12:23 PM A blow off valve's function it to "blow off" exessive intake manifold pressure caused by letting off the throttle when the turbo is spinning and providing boost.
	www.automotiveforums.com /t480741-blowoff_valve.html (324 words)

	Blow Off Valve FAQ
		Pressure release valve or more commonly known as a "Blow Off Valve", releases turbo pressure when the throttle plate is closed.
		valves with basic air holes are not as loud as blow off valves with horns (blitz) or air splitters (HKS).
		The output of the valve is rerouted back into the intake to maintain a perfectly sealed system as Toyota had originally desired.
	www.alltrac.net /tuning/bovfaq.html (1315 words)

	Enduro Motorsports [ Blitz Blow Off Valve ]
		The purpose of the BLITZ® Blowoff Valve DD is to relieve compressor surge without reducing compressor speed.
		It controls boost pressure that is built up by the turbo and vents it into the atmosphere when the car is not under load (in between shifts).
		A blowoff valve is actuated by pressure changes only, ensuring quick valve responses and complete closures at idle.
	www.enduromotorsports.com /BlitzBOV.html (173 words)

	SPOOLED MOTORSPORTS - BLITZ BLOW OFF VALVE KITS
		The Blow-off valve is essential to all turbocharged vehicles.
		The purpose of the BLITZ Blow-off Valve DD is to relieve compressor surge without reducing compressor speed.
		The BLITZ blow-off valve not only improves performance and response, but also increases the life of the turbocharger.
	www.spooledmotorsports.com /blitz_ss_bov_kit.html (155 words)

	HKS USA Racing Blowoff Valve Type II
		Racing Blowoff Valve Type II The HKS Racing Blow Off Valve Type II is a pull-type blow off valve for high horsepower applications.
		Similar in construction and function to the HKS SSQV, the Racing Blow Off Valve Type II uses a large single stage, aluminum pull-type valve to handle the extreme pressure and airflow discharge volume that is associated with high boost / horsepower applications.
		The Type II is engineered to accommodate up to 3.0 bar (43.44psi) of boost and can function accurately on vehicles in the 800 horsepower range.
	www.hksusa.com /products/?id=759 (99 words)

	blowoff valve - SRO Magazine
		A blowoff valve (also known as a BOV or compressor relief valve) releases the pressure surge in the intake system between the turbocharger and the throttle body when the turbocharger is producing boost and the throttle is suddenly closed.
		a blowoff valve is just used for turbo cars, after reading what it does for a car, why would you need it on a n/a car?
		Strangely enough, my truck (which is a factory turbo) didn't come with a BOV or compressor relief valve.
	www.streetracing.org /boards/showthread.php?t=28676 (730 words)

	TiAL Sport 44mm Wastegate & 50mm Blowoff Valve - Super Street Online
		It features a large 1.98 in (50.5mm) valve; we believe this is the largest valve available with the highest flow capacity.
		• The valve seal utilizes a Viton O-ring that is clamped in place to prevent the possibility of sticking to the seat and pulling out.
		The clamp, valve, and housing will be offered in Silver, Titanium Gray, Red, Blue, and Purple to allow you to mix or match the clamp, body, and valve assembly to create a look unique to your application.
	www.superstreetonline.com /techarticles/130_0406_tial_sport_44mm_wastegate_50mm_blowoff_valve/index.html (588 words)

	Valve 4U - Blowoff Valve
		I was looking around for a blowoff valve and I seen the HKS Racing Bypass Valve and the HKS Racing Blowoff Valve Type II.
		of valve is based on flow and not boost pressure.
		This is the HKS SSQV Blowoff Valve Kit for the TOYOTA Supra 1993-1998 Turbo.
	www.valve-4u.com /blowoffvalve (791 words)

	Area 1320-All your AWD Turbo & Import Performance Needs (Site not responding. Last check: 2007-09-10)
		valve to diapharm ratio provide performance that cheep piston
		The HKS Super Sequential Blowoff Valve (SSQV) is a dual stage
		pressure also keeps the valve closed against its seat.
	www.area1320.com /blowoff.html (219 words)

	HKS SSQV Blowoff Valve Kit for 03 - 04 EVO VIII
		The Super Sequential Blow Off Valve is a pull type relief valve, unlike other blow off valves which are push type.
		The SSBV is actuated by pressure alterations only, ensuring quick valve response and complete closure during idle.
		It is engineered utilizing a small primary valve for ultra quick activation along with a secondary valve for additional relief capacity.
	www.eautoworks.com /ord-Auto~styling-Blow~Off~Valve-1-15654.htm (422 words)

	::Products - Air Components:: vortechsuperchargers.com
		Vortech Maxflow Bypass/Blowoff Valves improve supercharger operations by opening to relieve unwanted pressure during deceleration, this reduces heat build-up and eliminates compressor surge.
		Other features include a revised valve design utilizing an anodized aluminum valve head with an O-ring seal, a new shaft design that allows valve head articulation for perfect sealing, and an improved dual vent design.
		Our Maxflow Racing Bypass/Blowoff Valve flows 320 CFM @ 8 PSIG and features a compact design that is ideal for imports and others with tight engine compartments.
	www.vortechsuperchargers.com /products/aircomp.html (465 words)

	Boiler Safety and Water- Pressure Relief Valves
		valve or valves may be set within a range of 3%
		of the highest pressure to which any valve is set.
		valves) may be set within a range not to exceed
	www.tpub.com /content/construction/14259/css/14259_236.htm (421 words)

	VortechSuperchargers.com Online Store: Maxflow bv57 Blowoff/Bypass Valve, Clear Anodized (Site not responding. Last check: 2007-09-10)
		57 Valve improves supercharger operations by opening to relieve unwanted pressure during deceleration, this reduces heat build-up and eliminates compressor surge.
		These units feature a "rolling diaphragm" design with a -4 AN signal hose connection and dual filtered vents which provide ultra-quick valve response along with unmatched reliability.
		Mechanically retained Viton valve seat for zero pressure loss under boost.
	www.vortechsuperchargers.com /Merchant2/merchant.mvc?Screen=PROD&Store_Code=VEOS&Product_Code=8D205-003 (148 words)

	Robear Racing. BLITZ DUAL DRIVE BLOWOFF VALVE: LANCER EVO 8 03-UP
		The Blowoff Valve DD (Dual Drive) design flows 20% more than our previous model while emitting a uniquely aggressive sound.
		For maximum response the DD uses the small port for low boost and a a larger port for high boost.
		The blow off valve is constructed of heavy-duty die-cast aluminum and is capable of handling up to 18psi(1.2bar).
	www.tornactive.com /pd_blitz_dual_drive_blowoff_valve.cfm (157 words)

	Engine & fuel engineering - Turbo BlowOff Valve Placement?
		The valve doesn't do anything directly related to shockwaves, nor does it have the capability to respond to rapid pressure variations (depending on what you call rapid).
		blow off valve should be nearest the throttle body, as air reversal occurs in the pipework between the valve and the closed throttle.
		I have tried a bypass valve in both locations in my intercooler equipped Merkur XR4Ti and it did a much better of mitigating compressor stall on throttle closing when I moved it from the compressor outlet to just in front of the throttle body.
	www.eng-tips.com /viewthread.cfm?qid=36872 (831 words)

	Blow Off Valve Kit for MazdaSPEED6
		When adding performance accessories to a turbocharged vehicle, a blow off valve that is capable of dealing with the additional airflow and pressures should be selected.
		Aftermarket blow off valves are designed specifically for larger quantities of air and higher pressures.
		The CPE blow off valve kit comes complete, with a high quality HKS “super sequential” Blowoff valve, CPE designed and manufactured adapter flange, and all of the hardware necessary to use this Blowoff valve in either recirculation mode or dump-to-atmosphere mode.
	www.cp-e.com /2027.html (167 words)

	Blowoff Valve - NASIOC
		noooo...a dump valve is the same thing as a bypass valve.
		I personally just got in a Forge valve (Stratmosphere) so I'm gonna check it out as soon as i get out of work.
		Jon, in more simple terms, when accelerating, the wastegate closes, directing exhaust gas through a centrifugal turbine which is connected to a centrifugal compressor through a shaft.
	forums.nasioc.com /forums/showthread.php?t=40402 (618 words)

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