True Dual (X pipe) Vs. Y pipe Exhaust
03-08-2011, 04:10 PM
#18
Administrator
Well simple physics state that with a smaller diameter, you have more restriction, but at the same time the exhaust will flow at larger speeds to maintain the same mass flow rate. Think of it as a two lane road vs a four lane highway, you'd need double the speed in a two lane road to flow the same amount of cars in the same time frame. That's why at low rpm's you're better off with a small exhaust to help flow the gases at a high speed whereas at high rpm's, you want to flow as much exhaust gases as possible, hence the larger diameter becomes a more desirable choice.
What an x-pipe does though, is that it improves flow by creating a scavenging effect, since exhaust gases flow in a pulse manner rather than continuous, the gaps between the pulses create negative pressure that suck in the pulses coming from the other cylinders and so on.
It all comes down to tuning the length of the pipes and design of x-pipe bends, to improve flow at certain rpm range, you can never have a "Good-for-all rpm's" exhaust, not without having some sort of varying exhaust geometery
What an x-pipe does though, is that it improves flow by creating a scavenging effect, since exhaust gases flow in a pulse manner rather than continuous, the gaps between the pulses create negative pressure that suck in the pulses coming from the other cylinders and so on.
It all comes down to tuning the length of the pipes and design of x-pipe bends, to improve flow at certain rpm range, you can never have a "Good-for-all rpm's" exhaust, not without having some sort of varying exhaust geometery
03-08-2011, 04:52 PM
#20
Administrator
Because on a naturally aspirate engine, you would benefit from the scavenging effect of exhaust pulses
Initial scavenging takes place in the collecter of your headers, then both headers collect together using an X pipe or whatever. It's just the way to benefit most out of a naturally aspirated V-engine
Initial scavenging takes place in the collecter of your headers, then both headers collect together using an X pipe or whatever. It's just the way to benefit most out of a naturally aspirated V-engine
03-09-2011, 08:28 AM
#25
06-08-2014, 12:32 AM
#28
Registered User
I don't know if this is a stupid question, what if I installed a X or H pipe on my stock 2013 G37S sedan stock c/b? Would that be stupid? Or would there be some benefit? Sorry bringing up an old thread.
Last edited by IcemanVQ37; 06-08-2014 at 01:50 AM.
09-11-2017, 11:23 PM
#29
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Advice on X-Pipe
Hey! Sorry im still kind of new to car terms and whatnot. So far I have DC short ram intakes, HKS Hi Power Mufflers, Kinetix HFC's, and a Megan Y-Pipe. I want to make my car louder or at least have it sound better. What X-Pipe should I get? Should I even get a X-pipe? What is back pressure? Is it worth it?
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