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gold28 Forums Junkie Location: Madrid - Spain Registered: August 2002	Re: Making a custom manifold Thu, 16 January 2003 20:50 From what i know, which isn't a lot really, there is two approaches to building turbo manifolds. The first is to tune them such as what japspec was saying. This rely's on developing a smooth flow of gas through the manifold/turbo. I imagine that it would be much more efficient high RPM. At low RMP, the hysteresis (read turbo lag) inherent in this system means that you will sacrifice low RPM power. The second method is to make them as short as possible and rely on the pressure as the exhaust gas immediatly exits the engine. This allows the turbo's to spool up a bit quicker as the pressure differential comes in high pulses rather than a gradual build up. If you have a look at the standard setup on the 1G engine (and most other twin turbo engines), this is the approach used. Great for power at lower revs, but inefficient at high RPM. I am no expert in Turbo manifold design, but did study fluid dynamics at Uni and know that you can't just chuck it all together. My advice is to visit an automotive book shop and get a good book on manifold or turbo design and make an informed decision before you start waving a welder around. But then again, I'm an engineer and get told everyday that complicate simple problems. [Report message to a moderator]

	Subject	Poster	Date
	Making a custom manifold	japspec	Tue, 14 January 2003 09:36
	Re: Making a custom manifold	TD42T	Tue, 14 January 2003 09:55
	Re: Making a custom manifold	TE72_Turbo	Tue, 14 January 2003 10:57
	Re: Making a custom manifold	TD42T	Tue, 14 January 2003 11:55
	Re: Making a custom manifold	japspec	Tue, 14 January 2003 21:45
	Re: Making a custom manifold	japspec	Wed, 15 January 2003 06:47
	Re: Making a custom manifold	TD42T	Wed, 15 January 2003 09:06
	Re: Making a custom manifold	TRACTION_ISSUES	Wed, 15 January 2003 10:51
	Re: Making a custom manifold	japspec	Thu, 16 January 2003 01:31
	Re: Making a custom manifold	mrshin	Thu, 16 January 2003 04:11
	Re: Making a custom manifold	TD42T	Thu, 16 January 2003 06:51
	Re: Making a custom manifold	TRACTION_ISSUES	Thu, 16 January 2003 08:41
	Re: Making a custom manifold	japspec	Thu, 16 January 2003 12:38
	Re: Making a custom manifold	gold28	Thu, 16 January 2003 20:50
	Re: Making a custom manifold	TRACTION_ISSUES	Fri, 17 January 2003 02:28
	Re: Making a custom manifold	TD42T	Fri, 17 January 2003 03:44

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