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Old 03-29-2004, 02:47   #1 (permalink)
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Exhaust Explained.....Must Read

Best explanation I have ever read or received from anywhere (If it is accurate)....

http://www.nsxprime.com/FAQ/Miscella...austtheory.htm


Will make me think twice before using the word "back pressure" in a positive sense again...

Enjoy...
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Old 03-29-2004, 02:58   #2 (permalink)
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Re: Exhaust Explained.....Must Read

Yeah, quite an interesting read. Thanks fullthrottle
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Old 03-29-2004, 04:13   #3 (permalink)
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Re: Exhaust Explained.....Must Read

I think this read refers more to turbo set-ups though.
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Old 03-29-2004, 07:29   #4 (permalink)
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Re: Exhaust Explained.....Must Read

Quote:
Originally Posted by dodgie
I think this read refers more to turbo set-ups though.
Don't know how you worked that out when they talk about headers - turbos don't have headers!

Good read - makes a lot of sense too. So now can anyone explain why smaller diameter primaries give better low down torque than larger diameter primaries? No? Me too!
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Old 03-29-2004, 07:37   #5 (permalink)
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Re: Exhaust Explained.....Must Read

This is also a good description of how extractors/headers work:

http://www.exhausttechniques.com.au/extract.html
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Old 03-29-2004, 10:45   #6 (permalink)
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Re: Exhaust Explained.....Must Read

So my car needs like a 3 1/2 inch exhaust????

(stock 351)
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Old 03-29-2004, 14:25   #7 (permalink)
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Re: Exhaust Explained.....Must Read

very interesteing....

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Old 03-29-2004, 16:21   #8 (permalink)
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Re: Exhaust Explained.....Must Read

What a load of shite. As if my car I6 needs a 3 inch system.
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Old 03-29-2004, 16:31   #9 (permalink)
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Re: Exhaust Explained.....Must Read

Quote:
Originally Posted by MustangNicko
What a load of shite. As if my car I6 needs a 3 inch system.
Like I said, I think this stuff is refering to turbo systems as far as pipe sizes go.
The suggested sizes for naturally aspirated I6 or V8 would be too big.
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Old 03-29-2004, 19:47   #10 (permalink)
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Re: Exhaust Explained.....Must Read

Quote:
Originally Posted by MustangNicko
What a load of shite. As if my car I6 needs a 3 inch system.
"Unfortunately, we know of no accurate way to calculate optimal exhaust pipe diameter. This is mainly due to the random nature of an exhaust system -- things like bends or kinks in the piping, temperature fluctuations, differences in muffler design, and the lot, make selecting a pipe diameter little more than a guessing game."

Quote:
Originally Posted by JC
Good read - makes a lot of sense too. So now can anyone explain why smaller diameter primaries give better low down torque than larger diameter primaries? No? Me too!
According to the article. A pipe too large will allow the exhuast gas to cool down too quick and loose velocity. At low RPMs where the gas is travelling slower, this could have a negative impact such as loss of torque. Smaller pipe could maintain exhaust gas velocity at lower RPM hence produce better "power". However at high RPMs the gas is obviously travelling much faster hence larger pipes are more beneficial?
At least that is how I have interpreted it from this article.
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Last edited by fullthrottle; 03-29-2004 at 23:03.
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