Is there any proof/opinions on a true dual system giving better performance than a 3" system?

Fixn2xlr8 · 09-28-2005, 08:34 AM

Ive talked to serveral people that think im nuts for waiting for a dual system with comments like " a simple 3 inch system will support up to 1000hp. Any thoughts? Dynos?

[badmoon] · 09-28-2005, 08:37 AM

Get whatever you want...if you want dual get dual. I have ASP TD and would never go back to single, no other reason than I like the way it looks and the way it sounds. I have no dyno numbers to prove it flows better than my old 3" milltek. Anyways that's my opinion.

BlackS4tt (Josh) · 09-28-2005, 08:38 AM

DPs>piggies, as Truedual>single

just depends how much you want to spend, and if you want every last bit of power out of the mod

Kidstar · 09-28-2005, 08:53 AM

...which is more than 3". Although the velocity of the exhaust is greater, more can escape, with 2 2.5's" than a single 3"...

Enigmagic · 09-28-2005, 09:00 AM

Fixn2xlr8 · 09-28-2005, 09:04 AM

Kidstar · 09-28-2005, 09:07 AM

Kidstar · 09-28-2005, 09:14 AM

Schnell! · 09-28-2005, 09:17 AM

In theory, the dual systems give the exhaust more flow than a single 3" pipe. However, there are issues with laminar flow, exhaust-gas velocity, etc. that make the analysis more complex.

BiturboBoy_V2.0_S3-- · 09-28-2005, 09:32 AM

still cross sectional area is not the end all be all. to be honest it will depend so much on the mufflers(most important) and the geometry itself that even basic pipe flow equations from fluid mechanics will not be enough. easiest way is to test.

09-28-2005, 08:34 AM	#1
Fixn2xlr8 AudiWorld Super User Garage is empty, add now Join Date: Apr 2005 Posts: 2,236	Is there any proof/opinions on a true dual system giving better performance than a 3" system? Ive talked to serveral people that think im nuts for waiting for a dual system with comments like " a simple 3 inch system will support up to 1000hp. Any thoughts? Dynos? __________________ Audi Haiku: The Spinning Turbo - Rejoice! The Air Becomes Speed! - My Money Is Gone.

09-28-2005, 08:37 AM	#2
[badmoon] Senior Member Garage is empty, add now Join Date: Sep 2002 Posts: 6,020	don't take this the wrong way but...who cares? Get whatever you want...if you want dual get dual. I have ASP TD and would never go back to single, no other reason than I like the way it looks and the way it sounds. I have no dyno numbers to prove it flows better than my old 3" milltek. Anyways that's my opinion.

09-28-2005, 08:38 AM	#3
BlackS4tt (Josh) AudiWorld Super User Garage is empty, add now Join Date: Jan 2004 Posts: 8,875	this is similar to the argument regarding piggie pipes vs aftermarket DPs... DPs>piggies, as Truedual>single just depends how much you want to spend, and if you want every last bit of power out of the mod __________________ ================================================== ============= Email: blacks4tt AT yahoo.com VAST Tuned Stage III, Blouch 997 KO4s, Custom FMIC, Stoptech, OZ

09-28-2005, 08:53 AM	#4
Kidstar New Member Garage is empty, add now Join Date: Jan 2005 Posts: 169	Not Sci Proof, but some basic math 2x2.5=5" in diamater flow... ...which is more than 3". Although the velocity of the exhaust is greater, more can escape, with 2 2.5's" than a single 3"...

09-28-2005, 09:00 AM	#5
Enigmagic Member Garage is empty, add now Join Date: Sep 2001 Posts: 3,114	that's not basic math, that's wrong. 2 2.5" pipes != 1 5" pipe __________________ 2001.5 s4 nogaro avant. motor rebuild in progress

09-28-2005, 09:04 AM	#6
Fixn2xlr8 AudiWorld Super User Garage is empty, add now Join Date: Apr 2005 Posts: 2,236	Not to split hairs here but I thought the dual systems were more like 2 2.25" pipes rather tha 2.5" __________________ Audi Haiku: The Spinning Turbo - Rejoice! The Air Becomes Speed! - My Money Is Gone.

09-28-2005, 09:07 AM	#7
Kidstar New Member Garage is empty, add now Join Date: Jan 2005 Posts: 169	Still....5">3"...

09-28-2005, 09:14 AM	#8
Kidstar New Member Garage is empty, add now Join Date: Jan 2005 Posts: 169	2 2.25">1 3"/2 2">1 3"/2 1.5"=1 3" the latter being less desirable.

09-28-2005, 09:17 AM	#9
Schnell! AudiWorld Senior Member Garage is empty, add now Join Date: May 2003 Posts: 712	*I'm no scientist, but area of 3" pipe = 9pi, area of 2 2.5" pipes = 12.5pi.* In theory, the dual systems give the exhaust more flow than a single 3" pipe. However, there are issues with laminar flow, exhaust-gas velocity, etc. that make the analysis more complex. __________________ 2001.5 Santorin 6MT Sedan EPL custom tune, AWE Twin2, ASP downpipes, X-1 intake, RS4 ICs, AWE vent boost gauge, Toy Guy shifter, APR snub mount, APR bipipe, 710Ns, Autospeed DTS, 18" RS4 DTMs, and K03s that just won't die.

09-28-2005, 09:32 AM	#10
BiturboBoy_V2.0_S3-- Elder Member Garage is empty, add now Join Date: Dec 2000 Posts: 12,498	wow, someone needs to learn to calculate area of a circle. lol. still cross sectional area is not the end all be all. to be honest it will depend so much on the mufflers(most important) and the geometry itself that even basic pipe flow equations from fluid mechanics will not be enough. easiest way is to test. __________________ AWESOME post, funny and informative for newbs...its not all right but i suggest you click!

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