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Mycroft Newcomer Location: UK Registered: July 2002	Re: 1JZ Y pipe (again) Sat, 20 July 2002 17:26 #Dont forget that you have turbines inside the exhaust to help the back pressure.(more back pressure at lower revs, less at higher, as they start to spin faster)# That is the '0.7' part of the formula. Torque generation low down needs heat, hence the restriction, just making the gas exit quickly will just mean the car is weak low down, ever noticed when the engine is cold (I know you don't really have proper Winters out there) even with elevated revs the engine can stall? Well that is a cold engine, the amount of torque generated is very low, well just up the temp and then look at it that way, if the engine is restricted it gets hot and full generation of torque is made. This is a balancing act, if you run at 14psi then you need a little less restriction not an excessive amount. The formula above allows you to do this, without changing cams then I think about 2300rpm is about right. that means the restriction or junction should be 217mm and shoulb quite abrupt, flowed but abrupt. [Updated on: Sat, 20 July 2002 17:29] [Report message to a moderator]

	Subject	Poster	Date
	1JZ Y pipe (again)	HedgehogSandwich	Wed, 03 July 2002 16:19
	Re: 1JZ Y pipe (again)		Thu, 04 July 2002 00:18
	Re: 1JZ Y pipe (again)	1jwunder	Thu, 04 July 2002 01:00
	Re: 1JZ Y pipe (again)	HedgehogSandwich	Thu, 04 July 2002 09:57
	Re: 1JZ Y pipe (again)	Manny	Thu, 04 July 2002 12:15
	Re: 1JZ Y pipe (again)	jza70-mel	Thu, 04 July 2002 13:07
	Re: 1JZ Y pipe (again)	HedgehogSandwich	Thu, 04 July 2002 13:31
	Re: 1JZ Y pipe (again)	jza70-mel	Thu, 04 July 2002 13:37
	Re: 1JZ Y pipe (again)	HedgehogSandwich	Thu, 04 July 2002 17:40
	Re: 1JZ Y pipe (again)	toypro	Thu, 04 July 2002 20:49
	Re: 1JZ Y pipe (again)	HedgehogSandwich	Thu, 04 July 2002 22:02
	Re: 1JZ Y pipe (again)	toypro	Thu, 04 July 2002 22:08
	Re: 1JZ Y pipe (again)		Thu, 04 July 2002 23:31
	Re: 1JZ Y pipe (again)	BlakeNZ	Fri, 12 July 2002 09:40
	Re: 1JZ Y pipe (again)		Mon, 15 July 2002 08:09
	Re: 1JZ Y pipe (again)	1jwunder	Tue, 16 July 2002 02:32
	Re: 1JZ Y pipe (again)	Mycroft	Thu, 18 July 2002 22:33
	Re: 1JZ Y pipe (again)	Manny	Sat, 20 July 2002 12:11
	Re: 1JZ Y pipe (again)	Bugman	Sat, 20 July 2002 12:14
	Re: 1JZ Y pipe (again)	Mycroft	Sat, 20 July 2002 17:26
	Re: 1JZ Y pipe (again)		Sun, 21 July 2002 04:43
	Re: 1JZ Y pipe (again)	Mycroft	Sun, 21 July 2002 10:21
	Re: 1JZ Y pipe (again)		Sun, 21 July 2002 22:25
	Re: 1JZ Y pipe (again)		Sun, 28 July 2002 11:03
	Re: 1JZ Y pipe (again)	1jwunder	Mon, 29 July 2002 01:16
	Re: 1JZ Y pipe (again)		Mon, 29 July 2002 03:05
	Re: 1JZ Y pipe (again)	Bounty	Mon, 29 July 2002 10:15

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