Pros/Cons: True Dual vs. Y-pipe cat back
09-06-2005 | 06:58 PM
#1
Pros/Cons: True Dual vs. Y-pipe cat back
What are the pros and cons of having either a true dual setup or catback with y-pipe? I will be going all NA, if that makes any difference. Any advice would be appreciated.
09-06-2005 | 10:19 PM
#2
i've seen it posted that with na, you want some back pressure for low end torque, hence, you want less flow. with fi, back pressure is the enemy. i'm just posting what i've read on this site.
check out this article:
www.cobbtuning.com/tech/exhaustdesign/index.html
check out this article:
www.cobbtuning.com/tech/exhaustdesign/index.html
Last edited by Z BOY; 09-06-2005 at 10:27 PM.
09-06-2005 | 10:53 PM
#3
Originally Posted by Z BOY
i've seen it posted that with na, you want some back pressure for low end torque, hence, you want less flow. with fi, back pressure is the enemy. i'm just posting what i've read on this site.
check out this article:
www.cobbtuning.com/tech/exhaustdesign/index.html
check out this article:
www.cobbtuning.com/tech/exhaustdesign/index.html
09-07-2005 | 06:16 AM
#4
That site does not say you want or need backpressure, it says...
"One thing I do want to explain before I get too far into this is backpressure. I hear "You need backpressure to make torque." all the time. And it even comes from "tuners" as well as customers. This is flat out not true. Before I arrived into the company of true tuners I fell into the same trap myself. The reality is that backpressure is the enemy. You want to keep it as low as possible. What you do want is to keep velocity up. However doing the things that keep velocity high involves slightly more backpressure under some conditions. You want to keep the gasses moving as quickly as possible to make both good torque and top end power. The perfect exhaust system would keep the gasses moving as fast as they did coming out of the cylinder and have zero backpressure. However this is impossible to achieve in the real world."
Please don't spread the backpressure myth.
Chris
"One thing I do want to explain before I get too far into this is backpressure. I hear "You need backpressure to make torque." all the time. And it even comes from "tuners" as well as customers. This is flat out not true. Before I arrived into the company of true tuners I fell into the same trap myself. The reality is that backpressure is the enemy. You want to keep it as low as possible. What you do want is to keep velocity up. However doing the things that keep velocity high involves slightly more backpressure under some conditions. You want to keep the gasses moving as quickly as possible to make both good torque and top end power. The perfect exhaust system would keep the gasses moving as fast as they did coming out of the cylinder and have zero backpressure. However this is impossible to achieve in the real world."
Please don't spread the backpressure myth.
Chris
09-07-2005 | 06:20 AM
#5
Not all Y pipe and true duals are created equal, you can't really have a general "what's better" when some true duals run small pipe and no crossovers others run crossovers with larger pipe. Y pipe systems have various configurations too.
The only consistent thing to compare is that a Y pipe system usually has less parts and that is neither here nor there once it's all installed.
Chris
The only consistent thing to compare is that a Y pipe system usually has less parts and that is neither here nor there once it's all installed.
Chris
09-07-2005 | 06:36 AM
#6
Thanks.
Originally Posted by HyperSprite
That site does not say you want or need backpressure, it says...
"One thing I do want to explain before I get too far into this is backpressure. I hear "You need backpressure to make torque." all the time. And it even comes from "tuners" as well as customers. This is flat out not true. Before I arrived into the company of true tuners I fell into the same trap myself. The reality is that backpressure is the enemy. You want to keep it as low as possible. What you do want is to keep velocity up. However doing the things that keep velocity high involves slightly more backpressure under some conditions. You want to keep the gasses moving as quickly as possible to make both good torque and top end power. The perfect exhaust system would keep the gasses moving as fast as they did coming out of the cylinder and have zero backpressure. However this is impossible to achieve in the real world."
Please don't spread the backpressure myth.
Chris
"One thing I do want to explain before I get too far into this is backpressure. I hear "You need backpressure to make torque." all the time. And it even comes from "tuners" as well as customers. This is flat out not true. Before I arrived into the company of true tuners I fell into the same trap myself. The reality is that backpressure is the enemy. You want to keep it as low as possible. What you do want is to keep velocity up. However doing the things that keep velocity high involves slightly more backpressure under some conditions. You want to keep the gasses moving as quickly as possible to make both good torque and top end power. The perfect exhaust system would keep the gasses moving as fast as they did coming out of the cylinder and have zero backpressure. However this is impossible to achieve in the real world."
Please don't spread the backpressure myth.
Chris
09-07-2005 | 08:25 AM
#7
The backpressure issue was exactly why I asked this question. I've heard that backpressure is good for an NA car. I'm trying to make a decision to get wider piping (a new exhaust) over the stock. So far for my exhaust, I have test pipes and will be installing headers shortly. Will an exhaust with more or less backpressure be beneficial in my setup?
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09-07-2005 | 05:43 PM
#8
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"One thing I do want to explain before I get too far into this is backpressure. I hear "You need backpressure to make torque." all the time. And it even comes from "tuners" as well as customers. This is flat out not true. Before I arrived into the company of true tuners I fell into the same trap myself. The reality is that backpressure is the enemy. You want to keep it as low as possible. What you do want is to keep velocity up. However doing the things that keep velocity high involves slightly more backpressure under some conditions. You want to keep the gasses moving as quickly as possible to make both good torque and top end power. The perfect exhaust system would keep the gasses moving as fast as they did coming out of the cylinder and have zero backpressure. However this is impossible to achieve in the real world."
09-07-2005 | 07:08 PM
#9
Originally Posted by HyperSprite
Not all Y pipe and true duals are created equal, you can't really have a general "what's better" when some true duals run small pipe and no crossovers others run crossovers with larger pipe. Y pipe systems have various configurations too.
The only consistent thing to compare is that a Y pipe system usually has less parts and that is neither here nor there once it's all installed.
Chris
The only consistent thing to compare is that a Y pipe system usually has less parts and that is neither here nor there once it's all installed.
Chris
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