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The Terminator
Exhaust
Does a 3" catback really make any difference over a 2.5"?
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<blockquote data-quote="WireMesh" data-source="post: 14679760" data-attributes="member: 155607"><p>A little input from looking around at exhaust data and an engineering background: exhaust gases are primarily nitrogen so for a decent estimate, they can modeled as an ideal gas. This allows the use of Charles' Law (assumes a constant pressure - atmospheric): V1/T1 = V2/T2.</p><p>I saw estimates of exhaust gas temperatures in the headers to be anywhere from 800-1600F and in the mufflers to be around 350F.</p><p>Plugging 1200F and 350F into the equation shows that a sample volume of 1ft^3 would shrink to a volume of 0.488ft^3 (Fahrenheit needs to be converted to Rankine to use Charles' Law)</p><p>While this is just based on estimates, it shows why a smaller pipe further downstream would not be a restriction since the gases are cooling off.</p></blockquote><p></p>
[QUOTE="WireMesh, post: 14679760, member: 155607"] A little input from looking around at exhaust data and an engineering background: exhaust gases are primarily nitrogen so for a decent estimate, they can modeled as an ideal gas. This allows the use of Charles' Law (assumes a constant pressure - atmospheric): V1/T1 = V2/T2. I saw estimates of exhaust gas temperatures in the headers to be anywhere from 800-1600F and in the mufflers to be around 350F. Plugging 1200F and 350F into the equation shows that a sample volume of 1ft^3 would shrink to a volume of 0.488ft^3 (Fahrenheit needs to be converted to Rankine to use Charles' Law) While this is just based on estimates, it shows why a smaller pipe further downstream would not be a restriction since the gases are cooling off. [/QUOTE]
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The Terminator
Exhaust
Does a 3" catback really make any difference over a 2.5"?
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