CRG Discussion Forum
Welcome, Guest. Please login or register.
Did you miss your activation email?
October 23, 2014, 09:28:10 AM

Login with username, password and session length
Search:     Advanced search
Welcome to the CRG Discussion Forum!
Forum registration problems: Make sure you enter your email correctly and you check your spam box first. *Then* email KurtS2@gmail for help.
105681 Posts in 12340 Topics by 4754 Members
Latest Member: Jake
* Home Help Search Login Register
+  CRG Discussion Forum
|-+  Camaro Research Group Discussion
| |-+  Mild Modifications
| | |-+  3" exhaust systems
« previous next »
Pages: [1] Print
Author Topic: 3" exhaust systems  (Read 1919 times)
william1
Member
***
Posts: 43


View Profile
« on: April 01, 2010, 10:03:58 AM »

 i need to update the exhaust on my 69z, i have been looking at the magnaflow 3" SS  systems with the X pipe, but the more i look around the more confused i get, 2".5 or 3", stock look or not, etc, originality is not the main thing for this one, just a nice solid performance good sounding system, any help on this would be appreciated..
Logged
JohnZ
CRG Member
*****
Posts: 4122


View Profile Email
« Reply #1 on: April 01, 2010, 10:29:58 AM »

A 3" exhaust system (with all its fit and clearance issues) may be great for "bling" on cruise night, but it's a waste of money; exhaust gases cool VERY rapidly before they ever get to the mufflers, and their density and velocity go WAY down in a hurry. A street engine doesn't need a 3" exhaust system.
Logged

'69 Z/28
Fathom Green
CRG
hydromo
Newbie
*
Posts: 6


View Profile Email
« Reply #2 on: April 03, 2010, 01:13:18 AM »

I have a ZZ427 crate engine headers built by Dan Lemons and a torque tech exhaust system 3 inch works great
Logged
77thor
Member
***
Posts: 230



View Profile WWW Email
« Reply #3 on: April 03, 2010, 01:31:28 PM »

3 inch pipes are only recommended for over 500 HP engines....
Logged

Fred - Milwaukee, WI
1969 Camaro SS350, M21, 12 Bolt, (01B LOS Build)
hotrod68
Hero Member
*****
Posts: 520


almost finished

rusticman48@aol
View Profile Email
« Reply #4 on: April 03, 2010, 11:26:43 PM »

I know if you uncork a 302 with headers you'll pick up 3-4 tenths at the drag strip, and that's significant. It's a balance of cam, compression, and exhaust gas velocity v/s backpressure. I have a 3" system on my car with a 406 and wouldn't dream of choking that engine with 2-1/2" pipes. But with either size pipes, the most important thing is the pipes being mandrel-bent. A 3" system with conventional bends is no better than a mandrel-bent 2-1/2" system from my experience. My 2 cents and good luck!
Logged

HotRod'68  1968 SS350 coupe undergoing frame-off resto/rod. 386/350/4.11s
Butternut Yellow    black standard interior
LB68SS350
Member
***
Posts: 24


View Profile
« Reply #5 on: April 04, 2010, 01:22:06 AM »

William -     I think a 2 1/2"  mandrel bent system on your Z would be the way to go. That's what I have on my '68 SS with a 355 (.030" over 350). It sounds great and makes really good power. I concur with JohnZ about losing exhaust velocity with a 3" system. That would KILL your torque, not to mention fitment problems. With the system I bought from Torque Tech, mandrel bent, 2 chamber Flowmasters, all 2 1/2", the car made 385 rear wheel horsepower and 448 rear wheel torque on the chassis dyno.     Larry
Logged
william1
Member
***
Posts: 43


View Profile
« Reply #6 on: April 23, 2010, 08:35:14 AM »

went with the magnaflow 2 1/2" dual,,,  sounds great, the fit was no problem, and is solid,, will change a few things next time i have it off the floor, but over all, i'm happy with it, thanks for the info.......
Logged
Pages: [1] Print 
« previous next »
Jump to:  

Powered by MySQL Powered by PHP Powered by SMF 1.1.19 | SMF © 2013, Simple Machines Valid XHTML 1.0! Valid CSS!
Page created in 0.083 seconds with 17 queries.