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OPPY Occasional Poster Location: MELB Registered: November 2004	Re: Exhaust Myth... Fact or Fiction? Thu, 10 February 2005 02:16 I know this may sound silly, but back pressure IS required on most Normally aspirated cars.. not all. Less back pressure is required on multi valve engines than push rod V8's Having formally worked in the exhaust trade, I have done a little study into it, see dyno charts and spoken to people that design headers for off the shelf purchase to V8 supercar. The reason it is required is acually to assist in drawing more air from the next cylinder after it fires, if there is no back pressure, there is no vaccum behind each pulse of exhaust flow, therefore not sucking it through, slowing down the exhaust flow and decreasing the efficency of your valves. Why does it vary from pushrod to multivalve.. simple, more valves = more exit points for the gasses. What I have seen, is that Not all n/a cars require it. A good example is the majority of Honda VTEC engines, for whatever reason, they work much better without back pressure. Another example of the oppisate is the genIII LS1 motor, the ideal exhaust setup was actually the one that nobody purchased.. everyone wanted the big bore twin 2 1/2 inch.. rather than the system that worked best.. twin 2 1/4" into single 3" rear. Hope I havent been too vauge.. But with exhaust.. there is no deadfast rule, it depends on head design, aspiration, mods, and about 100 other things. As for turbo's.. well thats a different concept all together... and yes, you do want some back pressure.. but a whole 1 to 3 pound (which is next to nothing)and the end of the dump has been what most have found to ideal for a torqey street setup, so no not every turbo needs that big mutha 3 inch system. Usually a top dump pipe design will make more usable power than that big bore exhaust system you just spent a fortune on. Before you deciede on what exhaust you want.. go and talk to a pro.. most exhaust places will have someone there who has some expierence with hi end exhausts.. they know much better than you or me!!! [Report message to a moderator]

	Subject	Poster	Date
	Exhaust Myth... Fact or Fiction?	Matt-itude	Wed, 09 February 2005 08:13
	Re: Exhaust Myth... Fact or Fiction?	Kyosho	Wed, 09 February 2005 08:24
	Re: Exhaust Myth... Fact or Fiction?	Matt-itude	Wed, 09 February 2005 08:29
	Re: Exhaust Myth... Fact or Fiction?	Fr3aK	Wed, 09 February 2005 09:11
	Re: Exhaust Myth... Fact or Fiction?	oldcorollas	Wed, 09 February 2005 09:36
	Re: Exhaust Myth... Fact or Fiction?	Kyosho	Wed, 09 February 2005 09:34
	Re: Exhaust Myth... Fact or Fiction?	oldcorollas	Wed, 09 February 2005 08:47
	Re: Exhaust Myth... Fact or Fiction?	Matt-itude	Wed, 09 February 2005 08:51
	Re: Exhaust Myth... Fact or Fiction?	oldcorollas	Wed, 09 February 2005 08:57
	Re: Exhaust Myth... Fact or Fiction?	towe_001	Fri, 11 March 2005 12:23
	Re: Exhaust Myth... Fact or Fiction?	draven	Wed, 09 February 2005 08:37
	Re: Exhaust Myth... Fact or Fiction?	Matt-itude	Wed, 09 February 2005 08:43
	Re: Exhaust Myth... Fact or Fiction?	oldcorollas	Wed, 09 February 2005 08:49
	Re: Exhaust Myth... Fact or Fiction?	Farkurnell	Wed, 09 February 2005 09:30
	Re: Exhaust Myth... Fact or Fiction?	Kyosho	Wed, 09 February 2005 09:36
	Re: Exhaust Myth... Fact or Fiction?	oldcorollas	Wed, 09 February 2005 09:40
	Re: Exhaust Myth... Fact or Fiction?	selk	Mon, 14 March 2005 08:39
	Re: Exhaust Myth... Fact or Fiction?	R-jay	Mon, 14 March 2005 19:49
	Re: Exhaust Myth... Fact or Fiction?	ke30king	Wed, 16 March 2005 12:25
	Re: Exhaust Myth... Fact or Fiction?	Farkurnell	Wed, 09 February 2005 09:45
	Re: Exhaust Myth... Fact or Fiction?	draven	Wed, 09 February 2005 09:47
	Re: Exhaust Myth... Fact or Fiction?	justcallmefrank	Wed, 09 February 2005 10:12
	Re: Exhaust Myth... Fact or Fiction?	MR 1JZ	Thu, 10 February 2005 00:58
	Re: Exhaust Myth... Fact or Fiction?	chrisss	Wed, 09 February 2005 09:49
	Re: Exhaust Myth... Fact or Fiction?	rokusan	Wed, 09 February 2005 10:26
	Re: Exhaust Myth... Fact or Fiction?	Bugman	Wed, 09 February 2005 22:28
	Re: Exhaust Myth... Fact or Fiction?	willwal98	Wed, 09 February 2005 22:30
	Re: Exhaust Myth... Fact or Fiction?	Bugman	Wed, 09 February 2005 22:41
	Re: Exhaust Myth... Fact or Fiction?	Mr Revhead	Wed, 09 February 2005 23:55
	Re: Exhaust Myth... Fact or Fiction?	OPPY	Thu, 10 February 2005 02:16
	Re: Exhaust Myth... Fact or Fiction?	oldcorollas	Thu, 10 February 2005 05:22
	Re: Exhaust Myth... Fact or Fiction?	oldcorollas	Thu, 10 February 2005 05:25
	Re: Exhaust Myth... Fact or Fiction?	greenta22	Thu, 10 February 2005 02:32
	Re: Exhaust Myth... Fact or Fiction?	buck naked	Thu, 10 February 2005 03:47
	Re: Exhaust Myth... Fact or Fiction?	Sam_Q	Thu, 10 February 2005 07:22
	Re: Exhaust Myth... Fact or Fiction?	oldcorollas	Thu, 10 February 2005 07:45
	Re: Exhaust Myth... Fact or Fiction?	oldcorollas	Thu, 10 February 2005 07:57
	Re: Exhaust Myth... Fact or Fiction?	Sam_Q	Thu, 10 February 2005 07:53
	Re: Exhaust Myth... Fact or Fiction?	oldcorollas	Thu, 10 February 2005 07:59
	Re: Exhaust Myth... Fact or Fiction?	YelloRolla	Thu, 10 February 2005 08:06
	Re: Exhaust Myth... Fact or Fiction?	Mr Revhead	Thu, 10 February 2005 09:54
	Re: Exhaust Myth... Fact or Fiction?	Big T	Thu, 10 February 2005 10:57
	Re: Exhaust Myth... Fact or Fiction?	jkvsnn	Thu, 10 February 2005 11:57
	Re: Exhaust Myth... Fact or Fiction?	oldcorollas	Fri, 11 February 2005 05:24
	Re: Exhaust Myth... Fact or Fiction?	jkvsnn	Wed, 16 February 2005 22:58
	Re: Exhaust Myth... Fact or Fiction?	oldcorollas	Thu, 10 March 2005 08:25
	Re: Exhaust Myth... Fact or Fiction?	indigoid	Thu, 10 March 2005 09:22
	Re: Exhaust Myth... Fact or Fiction?	greenta22	Thu, 10 March 2005 23:07
	Re: Exhaust Myth... Fact or Fiction?	oldcorollas	Fri, 11 March 2005 00:34
	Re: Exhaust Myth... Fact or Fiction?	Hunty	Thu, 10 February 2005 12:09
	Re: Exhaust Myth... Fact or Fiction?	Byatch	Sat, 12 February 2005 05:57
	Re: Exhaust Myth... Fact or Fiction?	3S-GE_Man	Sat, 12 February 2005 06:52
	Re: Exhaust Myth... Fact or Fiction?	EMD-AE86	Sat, 12 February 2005 08:25
	Re: Exhaust Myth... Fact or Fiction?	RWDboy	Sat, 12 February 2005 13:25
	Re: Exhaust Myth... Fact or Fiction?	Dunno	Sun, 13 February 2005 13:08
	Re: Exhaust Myth... Fact or Fiction?	Hunty	Thu, 17 February 2005 02:01
	Re: Exhaust Myth... Fact or Fiction?	jkvsnn	Thu, 17 February 2005 02:13
	Re: Exhaust Myth... Fact or Fiction?	79Rona	Fri, 11 March 2005 00:57
	Re: Exhaust Myth... Fact or Fiction?	mick	Fri, 11 March 2005 10:10
	Re: Exhaust Myth... Fact or Fiction?	Toobs	Sat, 12 March 2005 14:54
	Re: Exhaust Myth... Fact or Fiction?	river	Sat, 12 March 2005 23:33
	Re: Exhaust Myth... Fact or Fiction?	towe_001	Mon, 14 March 2005 01:36
	Re: Exhaust Myth... Fact or Fiction?	notorius	Mon, 14 March 2005 04:41
	Re: Exhaust Myth... Fact or Fiction?	73ke25	Tue, 15 March 2005 11:04
	Re: Exhaust Myth... Fact or Fiction?	hemi twofifteen turbo	Tue, 15 March 2005 12:13
	Re: Exhaust Myth... Fact or Fiction?	Norbie	Tue, 15 March 2005 12:42
	Re: Exhaust Myth... Fact or Fiction?	73ke25	Wed, 16 March 2005 12:30
	Re: Exhaust Myth... Fact or Fiction?	Norbie	Wed, 16 March 2005 13:37
	Re: Exhaust Myth... Fact or Fiction?	greenta22	Mon, 14 March 2005 07:33
	Re: Exhaust Myth... Fact or Fiction?	notorius	Mon, 14 March 2005 08:33
	Re: Exhaust Myth... Fact or Fiction?	Allan	Tue, 15 March 2005 13:01
	Re: Exhaust Myth... Fact or Fiction?	510rob	Tue, 15 March 2005 17:32
	Re: Exhaust Myth... Fact or Fiction?	R-jay	Tue, 15 March 2005 22:58
	Re: Exhaust Myth... Fact or Fiction?	510rob	Tue, 15 March 2005 23:00
	Re: Exhaust Myth... Fact or Fiction?	jeffro RA28	Wed, 16 March 2005 09:24
	Re: Exhaust Myth... Fact or Fiction?	YelloRolla	Wed, 16 March 2005 09:59
	Re: Exhaust Myth... Fact or Fiction?	oldcorollas	Wed, 16 March 2005 11:17
	Re: Exhaust Myth... Fact or Fiction?	jeffro RA28	Thu, 17 March 2005 09:10
	Re: Exhaust Myth... Fact or Fiction?	jeffro RA28	Wed, 16 March 2005 10:45
	Re: Exhaust Myth... Fact or Fiction?	ke30king	Wed, 16 March 2005 12:57
	Re: Exhaust Myth... Fact or Fiction?	ViPeR_NiPPleX	Wed, 16 March 2005 13:41
	Re: Exhaust Myth... Fact or Fiction?	tom210	Wed, 30 March 2005 14:13

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