Subject	good information ! Greg - can you explain this statement
Posted by	The Devils Z on February 25, 2009 at 5:40 PM
	This message has been viewed 108 times.
In Reply To	Some old theory’s are outdated and have been improved upon posted by Greg D. (Specialty-Z) on February 25, 2009 at 11:55 AM
Message	"Too large of a downpipe right away creates turbulance causing backpressure." I don't get how turbulance creates backpressure unless you are saying that the air flow the exits the turbine side will "fight against" the oncoming air flow and this in itself causes backpressure ... if this is true, is it also true that after a certain amount of turbine air flow, the turbulance effect changes positively because of increased exhaust velocity ? Assuming that I'm not smoking crack here, this makes sense why the spool is much better with your SZ expansion or a 2.5 SS downpipe because turbine exhaust velocity is maintained. Correct my errors and school me on this .. I'm trying to understand the mechanics ..thanks =============Sig begins here================ The Devils Z.com The Devils Z Pic 666 rwhp dyno The Demon Z pic (in progress) View Me! Disclaimer : Not Safe For Work !
Follow Ups	So I been reading on this 3" versus 2.5" exhausts - Carlos Ramirez 10:15:48 02/25/09 maybe its just me, but that did not make much sense - gt300zxtt 10:39:59 02/25/09 wouldn't it be better to go 3" dp/tp to 2.5" catback - krazykyle 11:14:55 02/25/09 nope -- full 3 inch is the way to go with proper tuning - The Devils Z 17:31:58 02/25/09 yes (n/m) - ali300zx(Irani) 19:06:32 02/25/09 Some old theory’s are outdated and have been improved upon - Greg D. (Specialty-Z) 11:55:13 02/25/09 I got a question if you did test cut outs and there was no - 5280Z_nightstalker 12:10:40 02/25/09 Answer.......... - Greg D. (Specialty-Z) 12:43:04 02/25/09 Not sure if you're referring to my results or not. . . - Scotts94z32 13:35:46 02/25/09 Your car is one of the cars tests I was mentioning ;-) - Greg D. (Specialty-Z) 17:28:33 02/25/09 Ahh got you so basically my question was the answer. - 5280Z_nightstalker 15:12:12 02/25/09 Re: Ahh got you so basically my question was the answer. - Greg D. (Specialty-Z) 17:27:26 02/25/09 that is good info thanks Greg. (n/m) - z32hp*700* 12:14:49 02/25/09 Re: Some old theory’s are outdated and have been improved upon - fototodd 12:53:21 02/25/09 Is the 3" catback available for the 2+2.. - ZDUCTIV 13:14:51 02/25/09 Nice! Why the huge price jump for 4-bolt vs 5-bolt? (n/m) - S.Watson 13:52:50 02/25/09 I'm guessing because of... - SeanK (StL) 16:37:13 02/25/09 Re: Some old theory’s are outdated and have been improved upon - Carlos Ramirez 14:09:34 02/25/09 Re: Re: Some old theory’s are outdated and have been improved upon - Greg D. (Specialty-Z) 17:24:27 02/25/09 Am I reading this right? - SeanK (StL) 16:53:23 02/25/09 Re: Am I reading this right? - Greg D. (Specialty-Z) 17:18:22 02/25/09 That clears it up. Thanks! (n/m) - SeanK (StL) 17:26:36 02/25/09 My Pleasure (n/m) - Greg D. (Specialty-Z) 17:30:21 02/25/09 Can you quiet down the 3" as much as the 2.5"? - not4resaleZ 18:18:12 02/25/09 Make a 3" version of this -----------------> - S.Watson 10:43:08 02/26/09 good information ! Greg - can you explain this statement - The Devils Z 17:40:10 02/25/09 Re: good information ! Greg - can you explain this statement - Greg D. (Specialty-Z) 18:00:04 02/25/09 Is the reduction in the 3" to 2.5" testpipes gradual - BigTDogg (MA) 18:45:13 02/25/09 thanks (n/m) - The Devils Z 01:23:53 02/26/09 So you are saying 3" expansion downpipes kicks ass - Pilot.P (NZ) 01:09:10 02/26/09 Your 2835s have exhaust exducer of - sparkie 17:23:42 02/25/09 Cool how mainstream turbos are incorporating F1 technology (n/m) - Greg D. (Specialty-Z) 17:33:16 02/25/09 I have Greg's 3" expansion DPs with the 3" - 2.5" test - phillyz 19:22:54 02/25/09 pfft, turbos are over rated... - Halo Z 21:07:27 02/25/09 lols! (n/m) - Barry (NJ) 19:41:00 02/26/09
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