Rectangular and oval exhausts - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

GripTerror · 08-30-2010, 08:18 PM

Why hasn't anyone done this?

What I'm talking about is using (obviously not necessarily this thick) piping in these fashions:

Especially something like this:

To me it makes complete sense to make fitment issues taken care of.. meaning on lower cars to not have to worry about bottom clearance, while allowing larger diameter for flow!

It may not be as simple as regular piped exhausts but... this makes complet sense for alot of the go low fellas.

wh0aitznic0 · 08-30-2010, 08:21 PM

Circuit sports did this with their oval downpipe.

kalypso123 · 08-30-2010, 08:31 PM

its a great idea, I thought of trying it but I havent had the chance.

if you can weld shoot for it

allntrlundrgrnd · 08-30-2010, 08:37 PM

Dr. Gas Exhaust - Store - 3" Oval Tubing and Bends

mikefc · 08-30-2010, 09:20 PM

Bending that doesnt seem fun.

PerilousActs · 08-30-2010, 09:24 PM

You more or less buy bends premade.

nismoracingsx · 09-01-2010, 07:07 AM

a lot of people don't even go low enough to need this, its the raccoon cannon near the back that causes problems...

axiomatik · 09-01-2010, 11:27 AM

The heat shield on my cat is pretty bent up and I'm not even that low.

slideslidegnarslide · 09-01-2010, 11:36 AM

actually a really good idea do it uppp

unreal- · 09-01-2010, 11:38 AM

Ive seen/read about Supra guys rocking 4" or 5" Oval piping. Since clearance gets really bad with the bigger pipings.

Try it out, and post it up!

duffman1278 · 09-01-2010, 12:14 PM

It's been done, just isn't as common since the oval tubing is pretty expensive.

ayuaddict · 09-01-2010, 12:23 PM

that shit is expensive. planning on it if i go forced induction on the Z.

WISH ONE · 09-01-2010, 12:29 PM

This is the route im going for my exhaust, Burns Stainless.

blue rexsti · 09-02-2010, 08:39 AM

square exhaust looks retarded. Doesn't flow with the car!

!Zar! · 09-02-2010, 02:19 PM

Quote:

Originally Posted by blue rexsti

square exhaust looks retarded. Doesn't flow with the car!

Because how exhaust tubing underneath your car looks is SO important.

atutt · 09-02-2010, 04:07 PM

I was never keen on the design of this car. But no one ever listened to me... Now they have to do it the way I told them to.. Anyway

soreballz · 09-02-2010, 04:09 PM

Square piping would be stupid. It wouldn't flow (as in flow air) anywhere near as well as round piping.

atutt · 09-02-2010, 04:15 PM

In theory square/rectangle exhaust is supposed to flow more. A 2'', .065 wall square tube has more internal space than a 2'', .065 round tube..

zylvia213 · 09-02-2010, 04:39 PM

Quote:

Originally Posted by atutt

I was never keen on the design of this car. But no one ever listened to me... Now they have to do it the way I told them to.. Anyway

that looks crazy... good for really low cars i would think

slideways2004 · 09-02-2010, 04:51 PM

I think most people dont do it because of cost. I would've done it but when I made my exhaust, I couldnt afford it

fckillerbee · 09-02-2010, 04:56 PM

Quote:

Originally Posted by soreballz

Square piping would be stupid. It wouldn't flow (as in flow air) anywhere near as well as round piping.

are you talking out of your ass, or do you have a physical proof of this?

i mean...space is space. if they occupy the same amount of space, I don't see one flowing more than the other.

Wabash9000 · 09-02-2010, 05:08 PM

I'm talking out my ass here, but I wonder if a round pipe might flow better because the air could vortex in the pipe. I don't know if that would make any difference. I wonder if the oval would change the sound at all. Straight pipe of the down pipe, no bends no nothing, would be loud as hell and might have a unique sound to it.

duffman1278 · 09-02-2010, 05:35 PM

Quote:

Originally Posted by Wabash9000

I'm talking out my ass here, but I wonder if a round pipe might flow better because the air could vortex in the pipe. I don't know if that would make any difference. I wonder if the oval would change the sound at all. Straight pipe of the down pipe, no bends no nothing, would be loud as hell and might have a unique sound to it.

The air flow, whether turbulent or round, wont really make a different. You would have to determine the reynold's number of a certain section in the pipe to determine whether it will be turbulent or laminar.

Assuming your cross sectional areas are the exact same, then it should not make a difference.

!Zar! · 09-02-2010, 06:02 PM

Quote:

Originally Posted by atutt

I was never keen on the design of this car. But no one ever listened to me... Now they have to do it the way I told them to.. Anyway

http://i75.photobucket.com/albums/i2...k/DSC04544.jpg

Isn't that custom welded D shape exhaust?

atutt · 09-02-2010, 07:58 PM

Quote:

Originally Posted by !Zar!

Isn't that custom welded D shape exhaust?

D shaped exhaust?

I cut a length of 1'' stainless tube. Then had a company shear off some stainless sheet in 3'' widths sections... Or was it 4''???

Either way. I hate it. Wish I never made it now that I look back. Should have jsut told them to go pound sand so I can do it my way.. Which they ended up having to do after I left.

BustedS13 · 09-02-2010, 09:09 PM

oval tipped exhausts just like that used to be in with eurotrash cars about a decade ago, when i was 16. maybe i'll scan some old super street NOPI ads for you guys.

i'm so fucking old

!Zar! · 09-03-2010, 12:06 AM

Quote:

Originally Posted by atutt

D shaped exhaust?

I cut a length of 1'' stainless tube. Then had a company shear off some stainless sheet in 3'' widths sections... Or was it 4''???

Either way. I hate it. Wish I never made it now that I look back. Should have jsut told them to go pound sand so I can do it my way.. Which they ended up having to do after I left.

Ohh, at first when I looked at it, it looked like you had taken a standard pipe and cut the bottom 1/4 off and welded a flat section to it. Now that I look at it, I see that it is four pieces. Looks extremely time consuming for such a fairly simple part; in terms of typical piping.

kalypso123 · 09-03-2010, 12:08 AM

Quote:

Originally Posted by fckillerbee

are you talking out of your ass, or do you have a physical proof of this?

i mean...space is space. if they occupy the same amount of space, I don't see one flowing more than the other.

the cross section of a square pipe gives you a little more area... ( the blue space ),
Assuming they're the same width across and height from top to bottom... the rounded ends rob you a little bit.

!Zar! · 09-03-2010, 12:33 AM

I wonder how much flow my dick has.

Matej · 09-03-2010, 01:03 AM

What about non-convex polygon exhaust piping?

08-30-2010, 08:18 PM	#1
GripTerror Zilvia Addict Join Date: Nov 2009 Location: Canada Age: 40 Posts: 685 Trader Rating: (0) Feedback Score: 0 reviews	Rectangular and oval exhausts Why hasn't anyone done this? What I'm talking about is using (obviously not necessarily this thick) piping in these fashions: Especially something like this: To me it makes complete sense to make fitment issues taken care of.. meaning on lower cars to not have to worry about bottom clearance, while allowing larger diameter for flow! It may not be as simple as regular piped exhausts but... this makes complet sense for alot of the go low fellas.

08-30-2010, 08:37 PM	#4
allntrlundrgrnd Nissanaholic! Join Date: Jul 2007 Location: Portland, OR Posts: 2,483 Trader Rating: (17) Rides Gallery: allntrlundrgrnd Feedback Score: 17 reviews	Dr. Gas Exhaust - Store - 3" Oval Tubing and Bends __________________ https://www.instagram.com/kook_180sx

08-30-2010, 09:20 PM	#5
mikefc Zilvia Junkie Join Date: Jul 2007 Location: Chicago Posts: 462 Trader Rating: (6) Feedback Score: 6 reviews	Bending that doesnt seem fun. __________________ MOON LIGHTER

09-01-2010, 11:27 AM	#8
axiomatik Post Whore! Join Date: Dec 2003 Location: ATL Posts: 4,702 Trader Rating: (0) Feedback Score: 0 reviews	The heat shield on my cat is pretty bent up and I'm not even that low. __________________

09-01-2010, 12:14 PM	#11
duffman1278 Post Whore! Join Date: Apr 2007 Location: Covina Age: 37 Posts: 2,844 Trader Rating: (8) Rides Gallery: duffman1278 Feedback Score: 8 reviews	It's been done, just isn't as common since the oval tubing is pretty expensive. __________________

08-30-2010, 08:31 PM	#3
kalypso123 (ノಠ益ಠ)ノ彡 Join Date: Apr 2008 Location: New York, NY Posts: 2,853 Trader Rating: (2) Feedback Score: 2 reviews	its a great idea, I thought of trying it but I havent had the chance. if you can weld shoot for it

08-30-2010, 09:24 PM	#6
PerilousActs Zilvia Junkie Join Date: Feb 2009 Location: Walton, Kentucky Age: 34 Posts: 545 Trader Rating: (6) Feedback Score: 6 reviews	You more or less buy bends premade.

09-01-2010, 07:07 AM	#7
nismoracingsx Zilvia Addict Join Date: Sep 2007 Location: Alachua, FL Age: 38 Posts: 969 Trader Rating: (32) Feedback Score: 32 reviews	a lot of people don't even go low enough to need this, its the raccoon cannon near the back that causes problems...

09-01-2010, 11:36 AM	#9
slideslidegnarslide Zilvia FREAK! Join Date: Mar 2010 Location: philly area Age: 35 Posts: 1,408 Trader Rating: (29) Feedback Score: 29 reviews	actually a really good idea do it uppp

09-01-2010, 11:38 AM	#10
unreal- Zilvia Junkie Join Date: Jan 2003 Location: Central NJ Posts: 516 Trader Rating: (16) Feedback Score: 16 reviews	Ive seen/read about Supra guys rocking 4" or 5" Oval piping. Since clearance gets really bad with the bigger pipings. Try it out, and post it up!

09-01-2010, 12:23 PM	#12
ayuaddict Post Whore! Join Date: Jan 2006 Location: Socal Age: 36 Posts: 4,017 Trader Rating: (9) Feedback Score: 9 reviews	that shit is expensive. planning on it if i go forced induction on the Z.

09-01-2010, 12:29 PM	#13
WISH ONE Post Whore! Join Date: Aug 2006 Location: orange county ca Posts: 2,738 Trader Rating: (13) Feedback Score: 13 reviews	This is the route im going for my exhaust, Burns Stainless. __________________ PARTING/SELLING MY COUPE. PM ME.

09-02-2010, 08:39 AM	#14
blue rexsti Zilvia Member Join Date: Jan 2008 Location: A-Town Posts: 216 Trader Rating: (6) Feedback Score: 6 reviews	square exhaust looks retarded. Doesn't flow with the car!

09-02-2010, 04:07 PM	#16
atutt Zilvia Addict Join Date: Oct 2006 Location: barrie, ontario, canada Age: 38 Posts: 997 Trader Rating: (0) Feedback Score: 0 reviews	I was never keen on the design of this car. But no one ever listened to me... Now they have to do it the way I told them to.. Anyway

09-02-2010, 04:15 PM	#18
atutt Zilvia Addict Join Date: Oct 2006 Location: barrie, ontario, canada Age: 38 Posts: 997 Trader Rating: (0) Feedback Score: 0 reviews	In theory square/rectangle exhaust is supposed to flow more. A 2'', .065 wall square tube has more internal space than a 2'', .065 round tube..

09-02-2010, 04:51 PM	#20
slideways2004 Nissanaholic! Join Date: Apr 2005 Location: Houston Age: 38 Posts: 1,706 Trader Rating: (6) Feedback Score: 6 reviews	I think most people dont do it because of cost. I would've done it but when I made my exhaust, I couldnt afford it __________________ http://essencegarage.wordpress.com/

09-02-2010, 05:08 PM	#22
Wabash9000 Zilvia Member Join Date: Oct 2006 Location: Kansas Age: 37 Posts: 217 Trader Rating: (0) Feedback Score: 0 reviews	I'm talking out my ass here, but I wonder if a round pipe might flow better because the air could vortex in the pipe. I don't know if that would make any difference. I wonder if the oval would change the sound at all. Straight pipe of the down pipe, no bends no nothing, would be loud as hell and might have a unique sound to it.

09-02-2010, 09:09 PM	#26
BustedS13 Post Whore! Join Date: Jan 2004 Location: Phoenix AZ Age: 40 Posts: 10,287 Trader Rating: (0) Feedback Score: 0 reviews	oval tipped exhausts just like that used to be in with eurotrash cars about a decade ago, when i was 16. maybe i'll scan some old super street NOPI ads for you guys. i'm so fucking old __________________

09-03-2010, 12:33 AM	#29
!Zar! Post Whore! Join Date: Nov 2004 Location: North Korea Posts: 14,579 Trader Rating: (27) Feedback Score: 27 reviews	I wonder how much flow my dick has. __________________

09-03-2010, 01:03 AM	#30
Matej Post Whore! Join Date: Feb 2007 Location: N/A Posts: 9,423 Trader Rating: (39) Feedback Score: 39 reviews	What about non-convex polygon exhaust piping?