Single exit exhaust?
I was thinking of buying a cat back but am on a budget. I noticed corksport's insanely cheap exhaust. I was wondering the benefits,if any, in going with a single exit exhaust system instead of a dual. Also does anyone have any movies or sound clips of a second gen with a corksport cat back?
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hey, the main advantage of using a single exit exhaust is weight. corksport is a great exhaust from what i understand (i have racing beat cat back myself) which surprised me considering how inexpensive it is as you said. there are some video clips of a corksport cat back here: http://videos.streetfire.net/search/corksport/0.htm
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Originally Posted by DeclareYrWar
hey, the main advantage of using a single exit exhaust is weight.
The main advantage of a single muffler exhaust is cost, that's all. |
on their web site it says it shaves off 36 lbs. At 289 plus shipping it doesn't look to bad. I just thought there might be some back pressure issues with dropping the second muffler.
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That's 36lbs compared to the stock exhaust. The weight difference compared to an aftermarket dual-muffler exhaust will be about half that.
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the other benefit is less turbulent exhaust flow...now this is a very minor and nearly moot point, but nonetheless it exists.
The dual systems on most of the setups for these cars are split Y pipes, since the exhaust has to get pushed through either way, it will end up favouring whichever side flows a tad better, meaning that any flow trickling out the marginally more resrictive side will be more turbulent and have less velocity. The single doesn't suffer from this, so long as the system is large enough to support what your running a single is better than a dual IMHO. |
Originally Posted by classicauto
The dual systems on most of the setups for these cars are split Y pipes, since the exhaust has to get pushed through either way, it will end up favouring whichever side flows a tad better, meaning that any flow trickling out the marginally more resrictive side will be more turbulent and have less velocity.
And exhaust gases do not "trickle"... |
yes I realize its clutching at straws a bit which is why I said the point is nearly moot.
My justification behind this comes from a loosely scientific test I did a while back... On a 2.5" straight pipe (with cat) to 2-2.5" pipes at the Y, I found that at idle both tips would puff equal breathes of exhaust...however, under load, the left tip would be puking ehaust while the right would have approx. half that (as I said loosely scientific, we hung paper over the tips - go ahead and laugh but if you saw the actual test you would have noticed the same thing) Now its very flawed becuase this wasn't a racing beat system or anything like that - it was custom made, but anyone who would look at the system would say both sides SHOULD flow equally......but it wasn't the case under load. Nonetheless I can't see it affecting performance to any measurable degree but I still stand by my opinion on an adequately sized single being slightly better for overall exhaust velocity and flow.....if nothing else the fact that the exhaust flow has to make an extra turn on the dual system in comparison to the single would suggest a mootly different amount of flow. |
Originally Posted by NZConvertible
Weight is not the main advantage. The weight savings over a dual muffler system of similar construction is well under 1% of the car's total weight, i.e. you'd have trouble measuring any performance difference let alone noticing it.
I guess what I'm trying to say is that if your overall goal is to increase the power to weight ratio, all these small things add up little by little in the end. |
Originally Posted by classicauto
On a 2.5" straight pipe (with cat) to 2-2.5" pipes at the Y, I found that at idle both tips would puff equal breathes of exhaust...however, under load, the left tip would be puking ehaust while the right would have approx. half that
I still stand by my opinion on an adequately sized single being slightly better for overall exhaust velocity and flow... ...if nothing else the fact that the exhaust flow has to make an extra turn on the dual system in comparison to the single would suggest a mootly different amount of flow.
Originally Posted by tarmac_terror
I can tell the difference in the way the car feels when I'm driving on an empty or full tank or if I have a passenger...
What do you believe is a reasonable reduction in weight before the effects can be noticed/measured? |
I have the 80mm turboback corksport exhaust. It is a very well made piece with great welds, it is nice and cheap. It performs very well and makes power.
The downside of a single exhaust with no resonator is it's freakin loud! I had to put in a ECV from Apexi so I could control the loudness. I can post a sound clip tomorrow maybe. |
if you own a FC 15#'s of saved weight is a lot!
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I like the single better, I had a custom single on my NA, and will got w/ the Apexi N1 single for my turbo. The single looks better imo, is lighter (even if only by a little) and doesn't have the back pressure at the y pipe like a dual would, I'm not saying one side would flow more or be unbalanced I'm saying especially for a turbo the less back pressure the better. the exhaust gas will cause some bp when it gets to that y. the sigle only has one way for it to flow. most things want to take the path of least resistance, which wwould be single. If its an NA particularly an s4 you want a little bp or you lose power. an s4 need some bp to activate the 5 and 6 ports. I had single catback on my s5 na that was 2.5 inch and it was good, not too big that it lost power and since 5 and 6 are opened by the air pump i didn't have to worry about bp.
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Originally Posted by NZConvertible
There is no extra turn in a dual system. The pipes follow exactly the same path a single would.
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Originally Posted by NZConvertible
The main advantage of a single muffler exhaust is cost, that's all.
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lol you know i was thinkin about what exhaust to pick up on the cheap and that seems to be a good one lol, wish it was dual but i can live with single
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corksport is INSANELLY LOUD. I have a single and it is loud as fuck too but the uncorksport is the loudest I have heard. If you do get it, just to let you know the silencer is a PITA. My bro blew his out more than a few times, before it MELTED. But it does keep it quiter while it lasts.
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Originally Posted by JDM_Infini
...and doesn't have the back pressure at the y pipe like a dual would...
Originally Posted by classicauto
No it doesn't, a single (how I design mine) goes from the turbo - right side of the car - straight back to the left corner of the vehicle. A dual system would go from the turbo to the front of the rear subframe in the center of the car and then make two 35 degree turns (in the form of a Y) and go to each corresponding side of the vehcile...
I don't quite understand that. |
to ask a different question,
would dual mufflers allow for more sound dampening at an equal flow rate? i mean, if you have a single exhaust that flows so much, can you split it into a dual exit setup an use the reduced flow rate ( velocity or mass, whatever) through each individual muffler to reduce exhaust noise? or is this not even a reasonable guess? |
Originally Posted by NZConvertible
The restriction caused by a Y is hugely overstated by people who simply don't understand fluid dynamics. Unless it's a hack job, the small amount of restriction caused by a Y is offset by the lower restriction of the two downstream pipes (assuming they're sized correctly). This is a very simple engineering concept that a bunch of people seem to have a lot of trouble understanding.
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i got a friend who have dual exhaust with 2 super turbo mufflers and dons't sound load and does are ship!
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Originally Posted by VashtheStampede
would dual mufflers allow for more sound dampening at an equal flow rate?
Originally Posted by JDM_Infini
I know its not a big difference at all , most wouldn't even notice it, but to those that are hard core every little bit helps...
It depends on what the car will be. ie- turbo, na, dd, drag, drift, street, etc. |
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