2.0 and exhaust size - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

porn-adkt · 02-24-2006, 07:27 PM

im used to 3.0s and 3" exhausts. Its very nice and can defenatly feel the difference. But im a bit confused if i really need to go that big on a SR20? Would a 2.5 be sufficient up to 350hp at the wheels? Since the lower displacement would mean higher rev to spool correct?

wouldnt a SR20 with a 2.5 exhaust be beninificial in quicker spool, less turbo lag, more quiet and good for up to atleast 300HP at the wheels?

macidcrook · 02-24-2006, 08:03 PM

with a smaller exhaust you also get back pressure which can slow down the compresser.

1mns13 · 02-24-2006, 11:36 PM

You'll want 3" for 300hp. It will also help you spool up the turbo.

sideview_180sx · 02-25-2006, 12:38 PM

just buy one already designed for the sr20 or turbo 240sx. Do some research, you may find a common relationship nearly all sr20det exhausts are 3" and bigger.

02-24-2006, 07:27 PM	#1
porn-adkt Zilvia Member Join Date: Oct 2003 Location: ny Posts: 242 Trader Rating: (0) Feedback Score: 0 reviews	2.0 and exhaust size im used to 3.0s and 3" exhausts. Its very nice and can defenatly feel the difference. But im a bit confused if i really need to go that big on a SR20? Would a 2.5 be sufficient up to 350hp at the wheels? Since the lower displacement would mean higher rev to spool correct? wouldnt a SR20 with a 2.5 exhaust be beninificial in quicker spool, less turbo lag, more quiet and good for up to atleast 300HP at the wheels?

02-24-2006, 08:03 PM	#2
macidcrook Zilvia Member Join Date: May 2004 Location: socal Age: 41 Posts: 178 Trader Rating: (1) Feedback Score: 1 reviews	with a smaller exhaust you also get back pressure which can slow down the compresser. __________________ Final Speed Garage- Auto repair and Performance 951-698-8161 Murrieta,CA

02-24-2006, 11:36 PM	#3
1mns13 Leaky Injector Join Date: May 2004 Location: Freedomland Posts: 84 Trader Rating: (0) Feedback Score: 0 reviews	You'll want 3" for 300hp. It will also help you spool up the turbo. __________________ www.the-nissan-240sx.com

02-25-2006, 12:38 PM	#4
sideview_180sx Zilvia FREAK! Join Date: Apr 2005 Location: somewhere north of mexico Posts: 1,538 Trader Rating: (3) Feedback Score: 3 reviews	just buy one already designed for the sr20 or turbo 240sx. Do some research, you may find a common relationship nearly all sr20det exhausts are 3" and bigger. __________________ feel the rythym. feel the ride. get on up. it's bobsled time. COOL RUNNINGS!!! formerly sideviewcivic Save a Horse. Drift This Cowboy. AirBag Club Member #0014