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MS-75 Regular Location: Adelaide Registered: June 2002	Re: external wastegate with two vacuum line connections? Wed, 03 August 2005 02:40 Supplying regulated pressure to the top port of the gate as well is the most accurate way of controlling boost. Using any form of bleed system to the lower port induces boost spiking as the response time of the gate is significantly decreased the higher the boost level used. The slowed response is due to the mass flow required through the system (and the finite time required for the system to fill) to achieve the pressure reduction to the gate actuator. These sort of boost spikes are what boost controllers tune out by preempting the spike and opening the gate earlier than it would otherwise to prevent overshoot due to slow response. A completely sealed boost control system gives the fastest possible response. If you have an 8psi gate, and supply a REGULATED 2 psi to the top of the diaphragm, the will be ZERO gate creep until 2psig is achieved. Once at 2PSIG the gate will commence creeping, and will be fully opeb at 10psig (ie 8+2=10). Moral of story-use regulated pressure to the top port to control boost on an external gate-NOT a bleed system to the lower (main) port. The lower port bleed type set-up may work, but a top port bleed system set-up correctly works better hands down. [Report message to a moderator]

	Subject	Poster	Date
	external wastegate with two vacuum line connections?	cri_ag	Sun, 19 June 2005 11:19
	Re: external wastegate with two vacuum line connections?	Cool1	Sun, 19 June 2005 11:21
	Re: external wastegate with two vacuum line connections?	cri_ag	Sun, 19 June 2005 11:34
	Re: external wastegate with two vacuum line connections?	Cool1	Sun, 19 June 2005 11:41
	Re: external wastegate with two vacuum line connections?	cri_ag	Sun, 19 June 2005 11:55
	Re: external wastegate with two vacuum line connections?	Cool1	Sun, 19 June 2005 12:02
	Re: external wastegate with two vacuum line connections?	Cool1	Sun, 19 June 2005 12:05
	Re: external wastegate with two vacuum line connections?	TE72_Turbo	Sun, 19 June 2005 12:08
	Re: external wastegate with two vacuum line connections?	Cool1	Sun, 19 June 2005 12:20
	Re: external wastegate with two vacuum line connections?	cri_ag	Sun, 19 June 2005 12:15
	Re: external wastegate with two vacuum line connections?	cri_ag	Sun, 19 June 2005 12:26
	Re: external wastegate with two vacuum line connections?	Chris Davey	Mon, 20 June 2005 02:32
	Re: external wastegate with two vacuum line connections?	JustenGT4	Mon, 20 June 2005 03:47
	Re: external wastegate with two vacuum line connections?	TE72_Turbo	Mon, 20 June 2005 05:59
	Re: external wastegate with two vacuum line connections?	Joshstix	Mon, 20 June 2005 06:05
	Re: external wastegate with two vacuum line connections?	JustenGT4	Mon, 20 June 2005 22:47
	Re: external wastegate with two vacuum line connections?	oldcorollas	Tue, 02 August 2005 13:26
	Re: external wastegate with two vacuum line connections?	Chris Davey	Mon, 20 June 2005 23:11
	Re: external wastegate with two vacuum line connections?	ae95	Tue, 02 August 2005 07:36
	Re: external wastegate with two vacuum line connections?	Chris Davey	Tue, 02 August 2005 09:30
	Re: external wastegate with two vacuum line connections?	ae95	Tue, 02 August 2005 10:42
	Re: external wastegate with two vacuum line connections?	rb30 boy	Tue, 02 August 2005 12:01
	Re: external wastegate with two vacuum line connections?	Chris Davey	Tue, 02 August 2005 22:33
	Re: external wastegate with two vacuum line connections?	ae95	Tue, 02 August 2005 13:07
	Re: external wastegate with two vacuum line connections?	rb30 boy	Tue, 02 August 2005 13:15
	Re: external wastegate with two vacuum line connections?	rb30 boy	Tue, 02 August 2005 13:20
	Re: external wastegate with two vacuum line connections?	ae95	Tue, 02 August 2005 13:35
	Re: external wastegate with two vacuum line connections?	MS-75	Wed, 03 August 2005 02:40

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