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JustenGT4 Forums Junkie Location: Canberra Registered: June 2003	Re: Which BOV is the best Wed, 19 May 2004 03:13 Some good points being raised but one that has been missed is the design used. Piston types, like turbosmart etc, are easier/cheaper to make but from my experience don't seem to have the flow capacity of the valve type BOVs. I have both a GReddy Type R (BIG piston) and a turbosmart type II and both work well but the GReddy is clearly the better performer. The valve type design simply allows better airflow and more flow per movement as well. Boost isn't the only consideration either, mass flow is also important as i think has been mentioned. Both reversion and surge seem to increase as the mass of air moved increases. Conceptually this seems logical to me but i'm not sure of the exact physics. A bigger BOV helps by moving more air. On the same engine at the same boost (and no leaks) a Blitz BOV did almost nothing to reduce reversion whereas the Type II cured it completely. On my TT V8 reversion is HUGE, i have no BOV as yet and the noise on gear change is louder than most BOV's you'll hear. I have my fav BOV, a GReddy Type R ready to go on asap. It'll be plumb back so hopefully it'll quieten things up a lot. as an aside i have a spare Type R FS is any is chasing one. Hell expensive new but i'm open to offers. [Report message to a moderator]

	Subject	Poster	Date
	Which BOV is the best	turbotree	Mon, 17 May 2004 12:10
	Re: Which BOV is the best	Cool1	Mon, 17 May 2004 12:21
	Re: Which BOV is the best	Draza	Mon, 17 May 2004 12:38
	Re: Which BOV is the best	Norbie	Mon, 17 May 2004 13:17
	Re: Which BOV is the best	pro_ke	Mon, 17 May 2004 13:33
	Re: Which BOV is the best	Rex_Kelway	Mon, 17 May 2004 13:19
	Re: Which BOV is the best	Chris Davey	Mon, 17 May 2004 13:33
	Re: Which BOV is the best	Draza	Mon, 17 May 2004 20:44
	Re: Which BOV is the best	Cyber-punk	Mon, 17 May 2004 21:04
	Re: Which BOV is the best	Draza	Mon, 17 May 2004 22:12
	Re: Which BOV is the best	shinybluesteel	Mon, 17 May 2004 22:44
	Re: Which BOV is the best	Norbie	Tue, 18 May 2004 03:33
	Re: Which BOV is the best	rob_RA40	Tue, 18 May 2004 04:17
	Re: Which BOV is the best	Cyber-punk	Tue, 18 May 2004 11:25
	Re: Which BOV is the best	Norbie	Tue, 18 May 2004 04:44
	Re: Which BOV is the best	SillyCar88	Tue, 18 May 2004 06:40
	Re: Which BOV is the best	EVOSTi	Tue, 18 May 2004 07:13
	Re: Which BOV is the best	RWDboy	Tue, 18 May 2004 07:26
	Re: Which BOV is the best	EVOSTi	Tue, 18 May 2004 07:41
	Re: Which BOV is the best	turbotree	Tue, 18 May 2004 08:22
	Re: Which BOV is the best	YelloRolla	Tue, 18 May 2004 08:27
	Re: Which BOV is the best	mx83toy	Tue, 18 May 2004 09:28
	Re: Which BOV is the best	TE72_Turbo	Tue, 18 May 2004 08:40
	Re: Which BOV is the best	BigWorm	Wed, 19 May 2004 14:45
	Re: Which BOV is the best	mx83toy	Wed, 19 May 2004 15:00
	Re: Which BOV is the best	Special Ed	Tue, 18 May 2004 12:45
	Re: Which BOV is the best	YelloRolla	Tue, 18 May 2004 13:22
	Re: Which BOV is the best	TurboRA28	Tue, 18 May 2004 23:43
	Re: Which BOV is the best	Special Ed	Tue, 18 May 2004 23:54
	Re: Which BOV is the best	JustenGT4	Wed, 19 May 2004 03:13
	Re: Which BOV is the best	YelloRolla	Wed, 19 May 2004 08:40
	Re: Which BOV is the best	Special Ed	Wed, 19 May 2004 09:30
	Re: Which BOV is the best	pro_ke	Wed, 19 May 2004 09:43
	Re: Which BOV is the best	EVOSTi	Wed, 19 May 2004 10:50
	Re: Which BOV is the best	YelloRolla	Wed, 19 May 2004 12:41
	Re: Which BOV is the best	3S-GE_Man	Wed, 19 May 2004 13:11
	Re: Which BOV is the best	YelloRolla	Wed, 19 May 2004 13:13
	Re: Which BOV is the best	3S-GE_Man	Wed, 19 May 2004 13:38
	Re: Which BOV is the best	EVOSTi	Thu, 20 May 2004 10:48

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