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  #11  
Old 05-30-2008, 01:14 PM
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DaveInDenver DaveInDenver is offline
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Quote:
Originally Posted by Red_Chili View Post
I think you are overthinking it.
Nah, what's wrong with studying it and trying to understand? It's weird how cracking open all those fancy books from classes I dozed through in school have neat stuff about fluid mechanics and thermodynamics. Who knew those stuffy old dudes with leather patches on their elbows and unkempt beards actually taught useful stuff?
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  #12  
Old 05-30-2008, 01:24 PM
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Nuttin' wrong with that. But if something is observed to work, it is the burden of the theory to explain it, not explain how it could not be so...
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  #13  
Old 05-30-2008, 02:13 PM
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Differing expansion rates as the exhaust gases cool. Bigger than 2" scavenged too much, smaller than 2" kinda choked things off. And 2.25 was the optimal diameter cat-back based on much trial and error.

You'll have to call Ted and ask him about dyno testing. I'm sure he will be happy to explain how he and others came to this conclusion based on experimentation.

Not knowing any of this, I put a 2.5" non-mandrel bent cat back on the Chili. I lost some low end. Sounded good. Wrapped out pretty well. Of course it worked out pretty well for the 5VZ swap eventually.
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  #14  
Old 05-31-2008, 08:13 AM
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Doug Thorley Header, 2.25 Exhaust, MagnaFlow Muffler, K&N Air Filter works great for my 88!
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