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oldcorollas Forums Junkie Location: Kita-Ku, Sapporo, Japan Registered: January 2003	Re: Exhaust Myth... Fact or Fiction? Fri, 11 March 2005 00:34 greenta22 wrote on Fri, 11 March 2005 10:07 oldcorollas wrote on Thu, 10 March 2005 19:25 would be very interested to hear what you think of the resonance and where the sound 'smooths out' etc etc.. what is happening when the sound flattens out? this is very audible on my motor at about 3000rpm, which is where the "powerband" seems to start. i assumed it was more to do with the overlap being most effective past that point. there are 3 or more audible changes in exhaust note timbre as far as i can tell. i have 4-2-1 pacemakers. this is what happens with mine at 5500rpm when the powerband starts (also 4-2-1 extractors.. home made, tuned length, made for 5500rpm) what i think is happening is that the nodes of resonance are moving around, and when it goes 'smoother' that is where the standing waves are at the right point to help the exhaust out of the motor. you WILL get multiple points where this happens, since oyu will get primary, secondary and tertiary resonant frequencies for given lengths. it is also a bit to do with overlap, but my cam is advertised as 3000-7000, but it's more like 4500-8000. before i put the EFI on i was not getting the smoothing outof sound, or the high rpm powerband, so you are definitely right, but it is also to do with intake design.... well, it's a complex system . i have done various changes of heads, exhaust anmd intakes and each step gives different audible results, and you can sort of tell what does and doesn't work.. ie too much reversion, resonance in wrong spot etc.. what rpm do you notice these changes? it is possible that you could use those rpm, and the lengths of your primaries and secondaries, to work out what the exhaust gas 'speed of sound' is at different rpm, and from this you can work out how to make them better! Cya, Stewart [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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