Subject	When it comes to exhaust on a turbocharged car...
Posted by	wildestyet on February 21, 2002 at 3:43 PM
	This message has been viewed 99 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	Bigger is always better. I've never heard of anyone saying a smaller exhaust is better for a TTZ. In an NAZ yes, to provide some backpressure a smaller exhaust might be better to keep more low end torque. In a turbocharged car, you want the gasses flowing away from the turbine as easily and as quickly as possible. A bigger pipe is going to be better for this. As to how how worthwhile it is? Depends on what sort of power level you're shooting for. I've heard of 500hp being a reasonable point to switch to 3". Personally if you're planning on going to extreme power levels, just start out with the 3" pipe and save switching later. If anything it might give an extra horse or so in the meantime.
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
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