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> Basic Intake and Exhaust Modification Guide, for normal aspirated cars v1.0

low yat 82
post Aug 7 2012, 10:34 PM


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QUOTE(empire23 @ Aug 7 2012, 08:07 PM)
Thanks for the pics!

Flow and CFD happen to be one of things I do for a living, that's why I'm quite interested in how it works, although my skill level is borderline retarded.

Given the Reynolds number of typical exhaust gas (composition tikamed with AGA-8) and the bend factor, I'm not sure how it would increase velocity via the swirl. I guess the velocity would increase from the restriction but the swirl would create more turbulence, sapping it of kinetic energy. But I guess I'm not qualified enough to give a final answer, given the shape of the thing.

Just dreaming of a good exhaust after my friends at CEEFC threw around the idea of a few of us quitting our jobs and building high performance Inconel manifolds and titanium exhausts.

The best way to create backpressure for a system without turbulence or disturbing the pulse or  lamellar flow is with a venturi type of restriction. Preferably cast or machined rather than rough welded.
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swirl bullet r act for those having too big pipe.. alot people upgrade too large pipe for small engine thus alot exhaust shop take easiest way by jus adding bullet rather tha change smaller diameter pipe. swirl bullet or louvered r totally nonsense..

velocity will increase for swirl bullet(for low rpm), same like d idea of swapping straight flow to sflow muffler
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devilkevin
post Aug 9 2012, 05:32 PM


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Any bro can help me with the different between this 2 downpipes for Honda City 2009? Which 1 will be better?

This....
http://a1.sphotos.ak.fbcdn.net/hphotos-ak-...4_3070722_n.jpg

vs this.....
http://i1098.photobucket.com/albums/g376/K...textractor2.jpg
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Slekerz
post Nov 12 2012, 06:22 PM


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Im using persona manual , just change to 4-2-1 extractor with centre bullet and straight muffler but the noise is still loud and bassy, want to reduce more noise what setup recommended?
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Shawnzz
post Nov 12 2012, 07:53 PM


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QUOTE(Slekerz @ Nov 12 2012, 06:22 PM)
Im using persona manual , just change to 4-2-1 extractor with centre bullet and straight muffler but the noise is still loud and bassy, want to reduce more noise what setup recommended?
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Use s-flow muffler
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Slekerz
post Nov 12 2012, 11:01 PM


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QUOTE(Shawnzz @ Nov 12 2012, 07:53 PM)
Use s-flow muffler
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Or can i add mid box i don't want to change my straight flow muffler .....
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Satanist
post Nov 22 2012, 09:52 AM


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QUOTE(Slekerz @ Nov 12 2012, 06:22 PM)
Im using persona manual , just change to 4-2-1 extractor with centre bullet and straight muffler but the noise is still loud and bassy, want to reduce more noise what setup recommended?
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change back stock exhaust system if you want quiet.

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hellsoldier82
post Nov 26 2012, 03:52 PM


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any recommendation for kia optima k5 full exhaust system? Price and location?
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christino
post Dec 21 2012, 10:54 AM


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hi bro, my current set up is 4 1 with flexible pipe, 2 bullet n s flow muffler, inspira 1.8 auto, that want i dun like is the vibration & sound bassy underneath the car floor is too strong, is this becoz of the bullet? the guy put the same size bullet with the piping(2'), i think supposed to be more bigger rite to reduce the pressure rite? muffler is ok, no sound
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wailup
post Dec 21 2012, 11:38 AM


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QUOTE(christino @ Dec 21 2012, 10:54 AM)
hi bro, my current set up is 4 1 with flexible pipe, 2 bullet n s flow muffler, inspira 1.8 auto, that want i dun like is the vibration & sound bassy underneath the car floor is too strong, is this becoz of the bullet? the guy put the same size bullet with the piping(2'), i think supposed to be more bigger rite to reduce the pressure rite? muffler is ok, no sound
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wraps it with thermal wrap. hope it will helps. tongue.gif sound / vibration dampening.
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christino
post Dec 21 2012, 03:16 PM


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u mean the extractor izit bro wailup?

This post has been edited by christino: Dec 21 2012, 03:16 PM
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wailup
post Dec 21 2012, 04:20 PM


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QUOTE(christino @ Dec 21 2012, 03:16 PM)
u mean the extractor izit bro wailup?
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i see ppl wrap until the muffler there.. (muffler no wrap la),
but im not sure whether is it unorthodox method or wat.. tongue.gif

@ADMIN i keep sending twice to post.. what the heck is happening? my side or your side got bug huh...
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Str33tBoY
post Dec 21 2012, 08:00 PM


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ani very silent 2" straight flow muffler?
New one or used japan one also can...
As long as it is durable enuf...
Prefer low bassy sound...
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ezry91
post Jan 2 2013, 09:32 PM


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lol i noob about this.

one question, can i change my gen2 exhaust to 3" ?
i just want the sound to be like boxer engine a bit (subaru) and the 3 inch exhaust looks nice actually.
No intention of upgrading the performance.
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Quazacolt
post Jan 3 2013, 04:00 AM


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QUOTE(ezry91 @ Jan 2 2013, 09:32 PM)
lol i noob about this.

one question, can i change my gen2 exhaust to 3" ?
i just want the sound to be like boxer engine a bit (subaru) and the 3 inch exhaust looks nice actually.
No intention of upgrading the performance.
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if you intend to downgrade the performance, go ahead smile.gif
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AMDAthlon
post Jan 3 2013, 11:55 AM


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Guys..sorry if this might be out of topic..

Whenever i accelerate my pedal to floor..there is extreme loud sound coming from below front left passenger side..It is extremely loud.
This is not engine noise i can confirm because the RPM are not that high..

Is this normal due to pedal to floor or some signs of exhaust leaks?
If yes,which part of it?


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amad108
post Jan 3 2013, 02:54 PM


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QUOTE(AMDAthlon @ Jan 3 2013, 11:55 AM)
Guys..sorry if this might be out of topic..

Whenever i accelerate my pedal to floor..there is extreme loud sound coming from below front left passenger side..It is extremely loud.
This is not engine noise i can confirm because the RPM are not that high..

Is this normal due to pedal to floor or some signs of exhaust leaks?
If yes,which part of it?
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can u describe the sound?
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shinjite
post Jan 3 2013, 05:10 PM


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QUOTE(ezry91 @ Jan 2 2013, 09:32 PM)
lol i noob about this.

one question, can i change my gen2 exhaust to 3" ?
i just want the sound to be like boxer engine a bit (subaru) and the 3 inch exhaust looks nice actually.
No intention of upgrading the performance.
*
How about the rest of your setup? Extractor and piping?
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Quazacolt
post Jan 3 2013, 05:26 PM


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QUOTE(AMDAthlon @ Jan 3 2013, 11:55 AM)
Guys..sorry if this might be out of topic..

Whenever i accelerate my pedal to floor..there is extreme loud sound coming from below front left passenger side..It is extremely loud.
This is not engine noise i can confirm because the RPM are not that high..

Is this normal due to pedal to floor or some signs of exhaust leaks?
If yes,which part of it?
*
not out of topic at all as it could be exhaust issue

for starters can you describe the sound?

does your car cabin vibrates/experience knocking when the sound is present?
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AMDAthlon
post Jan 3 2013, 09:34 PM


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QUOTE(shinjite @ Jan 3 2013, 05:10 PM)
How about the rest of your setup? Extractor and piping?
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I dont get it..
The rest of my exhaust are fine..
FYI,im using 4-2-1 Extractor.

QUOTE(Quazacolt @ Jan 3 2013, 05:26 PM)
not out of topic at all as it could be exhaust issue

for starters can you describe the sound?

does your car cabin vibrates/experience knocking when the sound is present?
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Nope..no vibrates occured at all..
Just some sort of BROOOOOM sound with something like sand in my exhaust?
The brooom sound is so loud that i need to crank up me speakers volume to 28++ to make it clear.(normal 20 ok edy)
And also,my car performance arent up to its normal.

Eg : normal condition i could reach up to 150kmh..But now barely 130kmh.

Do take note that this only occur when i press the pedal to floor(fully accelerate).
This sound does not occur if i lightly press the pedal.(normal style driving).


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Quazacolt
post Jan 4 2013, 11:36 AM


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QUOTE(AMDAthlon @ Jan 3 2013, 09:34 PM)
Nope..no vibrates occured at all..
Just some sort of BROOOOOM sound with something like sand in my exhaust?
The brooom sound is so loud that i need to crank up me speakers volume to 28++ to make it clear.(normal 20 ok edy)
And also,my car performance arent up to its normal.

Eg : normal condition i could reach up to 150kmh..But now barely 130kmh.

Do take note that this only occur when i press the pedal to floor(fully accelerate).
This sound does not occur if i lightly press the pedal.(normal style driving).
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if no vibration (suspected the exhaust piping knocking on your car's cabin, happened to me before) then it could be exhaust pipe leaking.

jack the car up and get news paper to fit around your exhaust to detect the leak (the paper will be black in no time if so) since you mentioned your usual top speed is unable to be attained.

another suspicion would be the muffler/mid box internal piping/noise suppression broken down, and may have been rattling within the box. (as you claimed "like sand in your exhaust")

and yes, this is normal in the sense that as you open up your throttle, more exhaust gas is released, hence the problem becomes more obvious smile.gif
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