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SilverGhost Forums Junkie Location: Sydney Registered: September 2004	Re: Disabling TVIS Tue, 30 August 2005 09:19 GTtwin wrote on Tue, 30 August 2005 13:07 Disconnecting the hose will cause the butterflies to stay permanently shut, as the system requires vaccuum to be in an open state. If you pull the electrical plug on the vac solenoid the system will stay open. This is incorrect unfortunately. The TVIS butterfly is spring loaded open. However it is managed by a vacuum tank that is connected between the TVIS actuator and the manifold. this tank has a one way valve on the inlet side which shuts as manifold vacuum decreases therefore maintaining a constant vacuum to the actuator. Between the vacuum tank and the actuator is the TVIS VSV, once engine speed of between 4000 and 4500 rpm (depending on engine load) is reached the VSV allows atmospheric air to enter the system between the tank and the actuator causing the spring loaded butterflies to open. This is necessary as manifold vacuum fluctuates and becomes nonexistent once boost pressure is reached. Therefore this system is deisgned to have the butterflies closed under 4500rpm and open above 4500rpm regardless of manifold pressure. [Report message to a moderator]

	Subject	Poster	Date
	Disabling TVIS	Roundy	Sat, 27 August 2005 13:48
	Re: Disabling TVIS	feral4mr2	Sat, 27 August 2005 22:01
	Re: Disabling TVIS	GTtwin	Mon, 29 August 2005 07:17
	Re: Disabling TVIS	berad	Mon, 29 August 2005 07:28
	Re: Disabling TVIS	justcallmefrank	Mon, 29 August 2005 07:42
	Re: Disabling TVIS	-==L=a=N=c=E==-	Mon, 29 August 2005 07:50
	Re: Disabling TVIS	justcallmefrank	Mon, 29 August 2005 07:57
	Re: Disabling TVIS	Roundy	Mon, 29 August 2005 23:04
	Re: Disabling TVIS	GTtwin	Tue, 30 August 2005 03:07
	Re: Disabling TVIS	SilverGhost	Tue, 30 August 2005 09:19
	Re: Disabling TVIS	Roundy	Tue, 30 August 2005 03:40
	Re: Disabling TVIS	quest	Tue, 30 August 2005 08:27
	Re: Disabling TVIS	GTtwin	Tue, 30 August 2005 09:18
	Re: Disabling TVIS	VeeP	Tue, 30 August 2005 14:17
	Re: Disabling TVIS	justcallmefrank	Tue, 30 August 2005 22:25
	Re: Disabling TVIS	VeeP	Wed, 31 August 2005 02:35
	Re: Disabling TVIS	justcallmefrank	Wed, 31 August 2005 02:42
	Re: Disabling TVIS	Hunty	Wed, 31 August 2005 02:49

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