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celicamad Forums Junkie Location: newcastle Registered: June 2002	Re: Blow off valve 'pshshhhhh' Wed, 26 February 2003 23:21 blow off valves do work .(otherwise known as wanker valves) BUT think of them this way all they do is vent the build up pressure between the turbo and the throttle body so the next time you come on boost the turbo doesnt have to spool up against the pressure so basically it reduces your spool up time Many toyota turbo engines have factory blow off valves anyway .So unless the factory one is leaking then a blow off valve is a complete waste of time . The reason a big gain was experienced in this case is more likely due to a compressor surge issue .Or the turbo is quite small and relative to the huge volume of plumbing a noticeable gain was experienced AFTERMARKET VENTING BLOW OF VALVES ARE A BAD IDEA ON AIRFLOW METER ENGINES The airflow meter has already measured a given amount of air before it even enters the turbo .You then vent that air to atmosphere .The amount of air that has enetered the intake prior to the throttle body is actually FAR less than the ecu belivies is there This can have all kinds of effects on mixtures and airflow (there are many other more complicated reasons this is just a simple way to look at it). Put simply for airflow metered engines use a blow off valve that returns to the vented air into the intake AFTER the airflow meter ..or leave the factory one on So if you fit a return blow off valve to an airflow metered car you wont get a pshhhht sound AND venting blow off valves are now illegal in NSW so dont fit a blow off valve for performance. A good boost control system is 10 times better gain in spoolup time [Report message to a moderator]

	Subject	Poster	Date
	Blow off valve 'pshshhhhh'	_ELiTeHaYDeN_	Wed, 26 February 2003 08:05
	Re: Blow off valve 'pshshhhhh'	_ELiTeHaYDeN_	Wed, 26 February 2003 08:20
	Re: Blow off valve 'pshshhhhh'	Danners	Wed, 26 February 2003 22:00
	Re: Blow off valve 'pshshhhhh'	celicamad	Wed, 26 February 2003 23:21
	Re: Blow off valve 'pshshhhhh'	Danners	Wed, 26 February 2003 23:34
	Re: Blow off valve 'pshshhhhh'	justcallmefrank	Thu, 27 February 2003 00:13
	Re: Blow off valve 'pshshhhhh'	celicamad	Fri, 28 February 2003 07:06
	Re: Blow off valve 'pshshhhhh'	mx83toy	Fri, 28 February 2003 11:34
	Re: Blow off valve 'pshshhhhh'	Soarer	Fri, 28 February 2003 13:19
	Re: Blow off valve 'pshshhhhh'	celicamad	Fri, 28 February 2003 23:38
	Re: Blow off valve 'pshshhhhh'	Soarer	Sat, 01 March 2003 00:47
	Re: Blow off valve 'pshshhhhh'	celicaboy_2000	Mon, 03 March 2003 04:39
	Re: Blow off valve 'pshshhhhh'	celicamad	Mon, 03 March 2003 09:13

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