Re: Custom exhaust manifold question? - Saab Performance Bulletin Board - Saabnet.com
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Re: Custom exhaust manifold question?
Posted by Dean (more from Dean) on Mon, 13 Dec 2004 08:17:02
In Reply to: Custom exhaust manifold question?, Inga
[Profile/Gallery]
, Mon, 13 Dec 2004 06:22:54
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With tuned headers, the lengths are important, but then the tuning only benefits at one engine speed. With a turbo, the lengths are very short before the first reflective transition (turbo), so that the RPMs where tuning of these lengths are well beyond the red line for the engine. The pressures in the exhaust manifold are also very high (around 30PSI for 15 PSI of boost etc) and the situation is very much different from tuned headers on a NA engine. So perhaps the objectives of shorter runs and less restriction, and heat retension, are more important than equal length spagetti knots. Spagetti knot headers also greatly uncrease the heat put into the engine bay. The size may prevent the use of a functional heat shield, especially when the objective is eye candy.
A turbo header should be compact as the turbo needs to be close to the exhaust ports, this makes the equal length objective all the more tortured. Some of the routes thus created may very well not be equal as some have more curve transitions than others.
So a simpler design might be easier to build and work just as well.
posted by 69.149.140...
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