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Allan Forums Junkie Location: Melbourne Registered: May 2002	Re: 1ggte bov install Tue, 19 April 2005 12:17 stradlater wrote on Tue, 19 April 2005 13:59 Norbie: I dis agree... Consider it this way: On Full boost just before change, turbo spins forward at say 40000RPM (just a figure for the purpose of the explaination). Now, when you change gear, the butterfly snaps shut, so all that compressed air decides to force it's way back out through the inducer of the turbo, hence putting resistance on the turbo and slowing it down. So, when we include this resistance, let's just say that by the time you've changed gear and re-opened the butterfly, the turbo is now spinning at 20000rpm due to the resistive force it's had put on it. So, you now have to wait for the turbo to spin back up to 40000rpm from 20000rpm. Now for with the BOV. Turbo doing 40000rpm. Butterfly snaps shut. Compressed air escapes and doesn't put resistive force on turbo. Turbo slows down of it's own accord. Reaches 32000rpm by the time you've re-opned throttle. Now you have to wait for the turbo to spin from 32000rpm to 40000rpm. Even if the turbo has slowed to 30000rpm naturally rather than 20000rpm, that's still 50% less time you have to wait for spool up. That's how it helps the spool up time. ahhhh but it has to re-pressurise the pipes after all this so what takes longer?? [Report message to a moderator]

	Subject	Poster	Date
	1ggte bov install	Sprockett	Mon, 18 April 2005 16:44
	Re: 1ggte bov install	HyDrA	Mon, 18 April 2005 22:35
	Re: 1ggte bov install	Norbie	Mon, 18 April 2005 22:38
	Re: 1ggte bov install	HyDrA	Mon, 18 April 2005 23:34
	Re: 1ggte bov install	indian	Tue, 19 April 2005 03:22
	Re: 1ggte bov install	Sprockett	Tue, 19 April 2005 03:57
	Re: 1ggte bov install	stradlater	Tue, 19 April 2005 03:59
	Re: 1ggte bov install	Allan	Tue, 19 April 2005 12:17
	Re: 1ggte bov install	Aust162	Tue, 19 April 2005 08:20
	Re: 1ggte bov install	-==L=a=N=c=E==-	Tue, 19 April 2005 09:12
	Re: 1ggte bov install	Norbie	Tue, 19 April 2005 22:28
	Re: 1ggte bov install	HyDrA	Tue, 19 April 2005 12:10
	Re: 1ggte bov install	Sprockett	Tue, 19 April 2005 14:11
	Re: 1ggte bov install	Norbie	Tue, 19 April 2005 22:29
	Re: 1ggte bov install	indian	Wed, 20 April 2005 00:54
	Re: 1ggte bov install	-==L=a=N=c=E==-	Tue, 19 April 2005 23:25
	Re: 1ggte bov install	-==L=a=N=c=E==-	Wed, 20 April 2005 00:58
	Re: 1ggte bov install	HyDrA	Wed, 20 April 2005 02:09
	Re: 1ggte bov install	indian	Wed, 20 April 2005 02:13
	Re: 1ggte bov install	indian	Wed, 20 April 2005 02:17
	Re: 1ggte bov install	-==L=a=N=c=E==-	Wed, 20 April 2005 02:17
	Re: 1ggte bov install	indian	Wed, 20 April 2005 02:21
	Re: 1ggte bov install	stradlater	Wed, 20 April 2005 02:39
	Re: 1ggte bov install	indian	Wed, 20 April 2005 02:42
	Re: 1ggte bov install	stradlater	Wed, 20 April 2005 02:45
	Re: 1ggte bov install	indian	Wed, 20 April 2005 02:47
	Re: 1ggte bov install	HyDrA	Wed, 20 April 2005 02:48
	Re: 1ggte bov install	indian	Wed, 20 April 2005 02:54
	Re: 1ggte bov install	stradlater	Wed, 20 April 2005 02:52
	Re: 1ggte bov install	stradlater	Wed, 20 April 2005 02:56
	Re: 1ggte bov install	indian	Wed, 20 April 2005 03:05
	Re: 1ggte bov install	indian	Wed, 20 April 2005 03:07
	Re: 1ggte bov install	Sprockett	Wed, 20 April 2005 03:50
	Re: 1ggte bov install	indian	Wed, 20 April 2005 03:52
	Re: 1ggte bov install	Sprockett	Wed, 20 April 2005 15:06
	Re: 1ggte bov install	indian	Wed, 20 April 2005 23:33
	Re: 1ggte bov install	Sprockett	Thu, 21 April 2005 01:55
	Re: 1ggte bov install	indian	Thu, 21 April 2005 02:03

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