Subject	From the Borla website: Bigger is not always better...
Posted by	Gordo 93TT NYC on February 21, 2002 at 4:24 PM
	This message has been viewed 89 times.
In Reply To	3" is not as good for performance in TTZ's as 2.5" (n/m) posted by F8IZHIS on February 21, 2002 at 02:50 PM
Message	A common misconception is that "bigger is better". Many enthusiasts, and manufacturers too, seem to feel that very large diameter pipes are the only way to go for performance. For street use, big pipes just take energy out of the exhaust, both by slowing down exhaust gas velocity and by cooling off the gases. While exhaust may leave the port at 1500 degrees or more, at the tailpipe it’s down to 150 degrees -- a sign energy has been lost. Velocity and uninterrupted flow are the real performance-making factors.
Follow Ups	Need new exhaust, recommendations 4 TT conversion, not 2 $'y (n/m) - CowBoy 14:23:44 02/21/02 Brullen, under $800, Stainless, X-pipe, 3" - not-hrz 14:43:57 02/21/02 3" is not as good for performance in TTZ's as 2.5" (n/m) - F8IZHIS 14:50:02 02/21/02 Oh pray tell why? (n/m) - wildestyet 15:06:15 02/21/02 Way too big...exhaust gases will have more turbulence>> - Seb 15:09:08 02/21/02 Turbulence has more to do w/ the bends than pipe diameter... - presto 15:19:59 02/21/02 strictly speaking within a straight pipe, it is better - Jefe 15:28:50 02/21/02 So fluid dynamics would suggest that 3" is better, right? (n/m) - presto 15:40:19 02/21/02 Re: strictly speaking within a straight pipe, it is better - kZtt (zedparts.com) 15:40:50 02/21/02 fluid has max velocity at center and ZERO velocity on edges> - my91z 15:47:16 02/21/02 Re: fluid has max velocity at center and ZERO velocity on ed - kZtt (zedparts.com) 16:08:46 02/21/02 it's been too long since I had the classes in school>> - my91z 16:20:24 02/21/02 yes i am currently in fluid dynamics , and that is what i - Jefe 16:34:42 02/21/02 Re: yes i am currently in fluid dynamics , and that is what - kZtt (zedparts.com) 16:55:04 02/21/02 So now that we know who our fluid dynamics guys are: - wildestyet 17:10:11 02/21/02 I don't remember why the fluid doesn't move at the wall>> - my91z 17:44:06 02/21/02 yea my book doesnt explain it at all. here is what it says: - Jefe 22:51:04 02/21/02 also, about Bernouli's equation and lower pressure>> - my91z 15:51:11 02/21/02 not that I'm a turbo expert, but it seems 3" would be better - my91z 15:33:26 02/21/02 Please provide evidence. Also, some have 2.5" Brullen. - presto 15:07:34 02/21/02 When it comes to exhaust on a turbocharged car... - wildestyet 15:43:25 02/21/02 "as easily and as quickly as possible" - F8IZHIS 17:26:57 02/21/02 From the Borla website: Bigger is not always better... - Gordo 93TT NYC 16:24:52 02/21/02 Turbocharged car is a different animal. - wildestyet 16:55:00 02/21/02 3" DP -> 3" to 2.5" TP -> 2.5" exhaust works 4my power level (n/m) - Arnel(Z32racing.com) 16:46:33 02/21/02 You know we never really made too many suggestions so... - wildestyet 17:02:50 02/21/02
Post a Followup	You cannot reply to this message because you are not logged in.