'69 chevelle lq9 exhaust Q - LS1TECH



Conversions & Hybrids LSX Engines in Non-LSX Vehicles
Sponsored by:
Sponsored by:

'69 chevelle lq9 exhaust Q

Reply
 
Thread Tools Search this Thread
Old 01-02-2007, 01:52 PM   #1
Teching In
Thread Starter
 
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, 01:58 PM   #2
TECH Senior Member
iTrader: (7)
 
Project GatTagO's Avatar
 
Join Date: Mar 2003
Location: The Druid City
Posts: 5,435
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
Project GatTagO is offline   Reply With Quote
Old 01-02-2007, 03:58 PM   #3
TECH Senior Member
iTrader: (12)
 
bczee's Avatar
 
Join Date: Jan 2006
Location: Concord, CA
Posts: 6,613
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 ?
bczee is offline   Reply With Quote
Old 01-02-2007, 04:31 PM   #4
Teching In
Thread Starter
 
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, 10:19 PM   #5
sawzall wielding director
iTrader: (4)
 
G-Body's Avatar
 
Join Date: Sep 2004
Location: Downers Grove, IL
Posts: 3,101
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.
G-Body is offline   Reply With Quote
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
LS1 pacesetter ceramic long tubes SSj0nny Parts Classifieds 0 10-12-2016 08:52 AM
Lq4 into 1968 Chevelle SS gimmeluvin Conversions & Hybrids 7 07-29-2013 09:27 AM
Stock Exhaust Manifolds,Chevelle MINK Conversions & Hybrids 21 03-15-2012 11:46 PM
have a stock f-body manifold... where do i find something that bolts to it? SIKHS 5 Conversions & Hybrids 2 03-09-2012 10:02 AM
What are you doing for gauges? (A-body) orang-kr8 Conversions & Hybrids 10 07-04-2009 04:32 PM


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 07:11 AM.