3in duals vs 3 1/2in
3in duals vs 3 1/2in Going with a dual setup... using no mufflers and no cats.
My headers have 3 1/2 inch primaries and i plan to run 3 1/2in piping into the X and then dump it right after.
This is going on a car that makes roughly 800whp. I read that 3inch duals can only support rougly around 800-900whp, is this true?
I want maximum gains out of this. I have not seen a picture of 3 1/2 duals before.. but my floorboards have already been clearanced.
My headers have 3 1/2 inch primaries and i plan to run 3 1/2in piping into the X and then dump it right after.
This is going on a car that makes roughly 800whp. I read that 3inch duals can only support rougly around 800-900whp, is this true?
I want maximum gains out of this. I have not seen a picture of 3 1/2 duals before.. but my floorboards have already been clearanced.
Originally Posted by SiL3NtXWS6
I want maximum gains out of this. I have not seen a picture of 3 1/2 duals before.. but my floorboards have already been clearanced.
It's not a track car but it's not a daily driver.
I use this car for street racing and track racing with some occasional stops in between.
So, you guys think i wouldn't notice a difference in power between 3 1/2in and 3in at ~560whp N/A?
I use this car for street racing and track racing with some occasional stops in between.
So, you guys think i wouldn't notice a difference in power between 3 1/2in and 3in at ~560whp N/A?
Go with 3.5", you *****. Like I told you and told you, Dr. Gas 3.5" X-pipe! CAUSE THATS HOW WE ROLL DOWN IN THE SOUF SIIDDEEE, WE BE STRAPPIN THEM GATS, AND DEUCIN THEM CATSSSSSSSS
^^^ WTF? ^^^ 
This car has 3.5" duals on it.
http://cgi.ebay.com/ebaymotors/ws/eB...tem=4626930042
Might just want to get some 3.5" bullets and clamp them onto the collectors with a turndown.
This car has 3.5" duals on it.
http://cgi.ebay.com/ebaymotors/ws/eB...tem=4626930042
Might just want to get some 3.5" bullets and clamp them onto the collectors with a turndown.
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On The Tree
Joined: Jun 2003
Posts: 150
Likes: 0
You need about 2.2 cfm and 20.3" of water per HP for max efficency. Pipes flow about 115 cfm per square inch across (a 3" pipe is about 7 in^2 -- 1.5^2 * 3.14).
3" dual
Max HP = pipe radius^2 * 3.14 * number of pipes * 115 / 2.2
738 HP = 1.5^2 * 3.14 * 2 * 115 / 2.2
3.5" dual
1005 HP = 1.75^2 * 3.14 * 2 * 115 / 2.2
Your call
3" dual
Max HP = pipe radius^2 * 3.14 * number of pipes * 115 / 2.2
738 HP = 1.5^2 * 3.14 * 2 * 115 / 2.2
3.5" dual
1005 HP = 1.75^2 * 3.14 * 2 * 115 / 2.2
Your call
Last edited by steve2001sh; Apr 28, 2006 at 07:19 AM.
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Originally Posted by steve2001sh
You need about 2.2 cfm and 20.3" of water per HP for max efficency. Pipes flow about 115 cfm per square inch across (a 3" pipe is about 7 in^2 -- 1.5^2 * 3.14).
3" dual
Max HP = 2.2 * pipe radius^2 * 3.14 * number of pipes * 115
738 HP = 2.2 * 1.5^2 * 3.14 * 2 * 115
3.5" dual
1005 HP = 2.2 * 1.75^2 * 3.14 * 2 * 115
Your call
3" dual
Max HP = 2.2 * pipe radius^2 * 3.14 * number of pipes * 115
738 HP = 2.2 * 1.5^2 * 3.14 * 2 * 115
3.5" dual
1005 HP = 2.2 * 1.75^2 * 3.14 * 2 * 115
Your call
Max HP = (pipe radius^2 * 3.14 * number of pipes * 115) / 2.2 = CFM/2.2
On The Tree
Joined: Jun 2003
Posts: 150
Likes: 0
Originally Posted by TheBlurLS1
BTW - You need to be dividing all that by 2.2, not multiplying.
Max HP = (pipe radius^2 * 3.14 * number of pipes * 115) / 2.2 = CFM/2.2
Max HP = (pipe radius^2 * 3.14 * number of pipes * 115) / 2.2 = CFM/2.2
