F.A.Q.    Register    Login    Home Members    Search

Toymods » Tech & Conversions » Exhaust Myth... Fact or Fiction? Show: Today's Posts  :: Show Polls  Email to friend

Author	Topic
Kyosho Regular Location: Wollongong Registered: November 2004	Re: Exhaust Myth... Fact or Fiction? Wed, 09 February 2005 08:24 Matt-itude wrote on Wed, 09 February 2005 19:13 I spose you have all heard the saying, "Engines need backpressure" im almost positive that this is a myth. i cannot see a reason why backpressure would help increase torque when it is just another force for the engine to overcome before it produces any power. i guess i would like to know why putting an exhuast "too big" on your car would reduce torque in the low rpm range. thanks for all your help. You are 100% correct... It is a myth... But the reason you loose torque down low on a HUGE exhaust... As the exhaust diameter is made larger, more gas can fill it? (You following) So your engine pumps out say 3L per minute at 2500RPM... Your STANDARD exhaust holds say 3L of gas... So it takes 1 minute to remove the gas at 2500RPM... Now if we increase the size of the exhaust, the exhaust now can take 6L of exhaust gas... So to get our exhaust fumes out, it now takes 2 minutes... With this extra amount of time, the exhaust gas cools, as it cools, it becomes more dense, and takes up less room... Now with it taking up less room, other gas can fill around it, so it slows down... Now another factor, is that, as the exhaust cools, air travels slower... So you have two factors slowing the gas down (Taking even LONGER then 2 minutes to get out) Now as it slows down and becomes more dense, it actually creates MORE back pressure... So the engine can't breath as easily at the low RPMS as well as it does at high RPMS (because the gas is moving quicker to start with and doesn't cool as much at higher RPMS) When the engine can't breath as well, you have to do 2 things... a) Retard ign timing b) lean the mixture... [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

Previous Topic:	MA70 windscreen fogging
Next Topic:	Rims to fit ln106/pug/xt130 upgrade

Powered by: FUDforum 2.3.8
Copyright ©2001-2003 Advanced Internet Designs Inc.