'69 chevelle lq9 exhaust Q - LS1TECH

Go Back   LS1TECH > LS1-LS2-LS3-LS6-LS7 PERFORMANCE > Conversions & Hybrids
Log In 
Search


Conversions & Hybrids
LSX Engines in Non-LSX Vehicles
Sponsored by
Don Hardy Race Cars


'69 chevelle lq9 exhaust Q

Reply
 
Thread Tools Search this Thread
Old 01-02-2007, 12:52 PM   #1
Teching In
 
Trader Rating: 0
Join Date: Oct 2006
Location: south bay
Posts: 44
Default '69 chevelle lq9 exhaust Q

ill be swapping in an lq9 into my chevelle soon and was looking for advice on what size exhaust tubing to run... my plans are: stock manifolds, h pipe, dynomax ultra flow mufflers,, but im not sure about diameter tubing to use,, any suggestions? the motor is stock and will probably remain stock for quite some time.
C for Chevelle is offline   Reply With Quote
Old 01-02-2007, 12:58 PM   #2
TECH Veteran
 
Project GatTagO's Avatar
 
Trader Rating: 6
Join Date: Mar 2003
Location: OshVegas Baby!
Posts: 4,092
Send a message via AIM to Project GatTagO
Default

Quote:
Originally Posted by C for Chevelle
ill be swapping in an lq9 into my chevelle soon and was looking for advice on what size exhaust tubing to run... my plans are: stock manifolds, h pipe, dynomax ultra flow mufflers,, but im not sure about diameter tubing to use,, any suggestions? the motor is stock and will probably remain stock for quite some time.
A dual 2.5" system will work very nice.

Andrew
__________________
Popular Hotrodding feature
GM High-Tech Performance feature
1970 GTO v2.0 build thread
1967 Cougar build thread

"You were the gun, your voice was the trigger, your bravery was the barrel, your eyes were the bullets."
Project GatTagO is offline   Reply With Quote
Old 01-02-2007, 02:58 PM   #3
TECH Senior Member
 
bczee's Avatar
 
Trader Rating: 12
Join Date: Jan 2006
Location: Concord, CA
Posts: 6,537
Default

Factoring in what Exhaust system to use on your swap is no different that any other is car exhaust system.

What helps is taking into account the following.. 1) how much HP you are producting, 2) how loud you want it, 3) how much room you have for the pipes and mufflers, 4) Street or race. After that, you can work with many of the Local Muffler Shops and/or Manufactors (Flowmater, Borla, etc.) of Kit Systems to suggest what size and system to use.

If you using a stock to a few mod of any LSx engine.... 2 1/2 should be find and a good starting point. Since you don't have to use a Cat.. that will do two things.. a) increase flow and b) make a bit little noise (not much, but some) when you step on the loud pedal..

I am using 2 1/2" on my LS1 Chevelle.. Flowmaster American Thunder Kit.

Hope that helps... Got any pic's of the project yet ?
__________________
71' Chevelle, 99 LS1/Viper T56,Full Hotchkis TVS,Custom Cowl Induction CAI
84' Z-28 350/T5
88' C4 Coupe L98/A4
71' Nova - LS1/4L60E , Full Hotchkis TVS Suspension
79' G-30 SWB 4X4 Van, 400cid / TH350 NP205
48' Ford F-1 1/2 Ton Truck, Stock 6cyc/3sp
bczee is offline   Reply With Quote
Old 01-02-2007, 03:31 PM   #4
Teching In
 
Trader Rating: 0
Join Date: Oct 2006
Location: south bay
Posts: 44
Default

i was leaning towards 2.5", thanks guys... i have some pics of when i got the car and gutted it, but need to resize them,, i'll take some pics when i get it back from paint and start the swap

bczee, i think i have your swap saved in my bookmarks for reference
C for Chevelle is offline   Reply With Quote
Old 01-02-2007, 09:19 PM   #5
sawzall wielding director
 
G-Body's Avatar
 
Trader Rating: 4
Join Date: Sep 2004
Location: Downers Grove, IL
Posts: 3,009
Default

I would say 2.5 duals would be enough. I am running 2.25 duals with an x pipe and 40 series flowmasters on my 5.3L with stock camaro manifolds and cats, and the exhaust outflows the cats. At WOT there is only 2-3psi in the manifolds and 0 psi behind the cats. If I drop the exhaust behind the cats my quarter mile time/MPH stays exactly the same, theres no loss running the 2.25" x pipe and mufflers. Its a little loud for my taste, but its a zero loss system so I can`t give it up.
__________________
85 El Camino SS black and silver, factory buckets. 6.0L/4l60E 3.73 posi. Down for rebuild
2005 CTS-V Stock...for now daily driver
1985 Monte Carlo SS 5.3L/4l80e/turbo still in pieces.
www.fquick.com/G-Body
Quote:
Originally Posted by Rodder
"possible" is a relative term around here... anything is possible. It's "possible" to put a whole K3500 4x4 dually truck rolling chassis under a brand new Mini body. Is it reasonable? No. Does it make sense? No. Is it possible? Yes.
G-Body is offline   Reply With Quote
Reply

Similar Threads
Thread Thread Starter Forum Replies Last Post
Lq4 into 1968 Chevelle SS gimmeluvin Conversions & Hybrids 7 07-29-2013 08:27 AM
Rear End Gears In LQ4/T56 Swapped 70 Chevelle ChevyMan1989 Conversions & Hybrids 9 03-25-2012 02:00 PM
Stock Exhaust Manifolds,Chevelle MINK Conversions & Hybrids 21 03-15-2012 10:46 PM
"Stock" LQ9 Horsepower??.... Dave-1970 Conversions & Hybrids 4 08-25-2011 10:10 AM
LS3 ex. manifold on a LQ4 - 65 Chevelle Build SIKHS 5 Conversions & Hybrids 3 08-23-2011 12:20 AM


Tags
69, car, chevelle, diameter, exhaust, flow, lq9, ls1, muffler, mufflers, pipe, quiet, size, stock, ultra, ultraflow


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are On
Refbacks are Off


 

All times are GMT -5. The time now is 03:54 AM.


Powered by vBulletin® Version 3.8.7 AC2
Copyright ©2000 - 2015, Jelsoft Enterprises Ltd.
Advertising - Terms of Service - Privacy Statement - Terms of Service - JOBS
Emails & Contact Details