Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums - Camaro5.com
 
PFYC
Go Back   Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums - Camaro5.com > Engine | Drivetrain | Powertrain Technical Discussions > Camaro V8 LS3 / L99 Engine, Exhaust, and Bolt-Ons

Camaro V8 LS3 / L99 Engine, Exhaust, and Bolt-Ons Bolt-Ons | Intakes | Exhaust

Reply
 
Thread Tools
Old 01-18-2011, 08:53 PM   #1
Fraxum


 
Fraxum's Avatar
 
Drives: 2013 TT IOM 1LE
Join Date: Jan 2010
Location: South NJ
Posts: 3,139
Send a message via AIM to Fraxum
LTs+cats versus high flow cats only

I have searched and read many threads on LTs and high flow cats. I am talking about just these mods versus each other with no tune. I found this:
  • LTs + high flow cats = 25 RWHP
  • High flow cats with stock manifolds = 20-22 RWHP

So LTs are worth 3-5 HP? Of course we are not comparing the same cats. And then I see if you add a tune to either you see around another 6-8 RWHP.

Do I have this wrong? Are we adding LTs mostly for sound?
__________________
Fraxum is offline   Reply With Quote
Old 01-18-2011, 09:10 PM   #2
The Stig
knows 2 facts about ducks
 
The Stig's Avatar
 
Drives: ...and they're both wrong
Join Date: Aug 2009
Location: The HMS Invincible
Posts: 26,675
The stock cats are very restrictive. Replacing them will free up a lot if rwhp. Yes getting high flow cats will give you some gains, but not the same.
__________________
Click to view my build thread
The Stig is offline   Reply With Quote
Old 01-18-2011, 09:59 PM   #3
Fraxum


 
Fraxum's Avatar
 
Drives: 2013 TT IOM 1LE
Join Date: Jan 2010
Location: South NJ
Posts: 3,139
Send a message via AIM to Fraxum
Quote:
Originally Posted by stieger View Post
The stock cats are very restrictive. Replacing them will free up a lot if rwhp. Yes getting high flow cats will give you some gains, but not the same.
Yes I was wondering the amount of the difference.

BTW you have one of the best sigs here. It would be great to see the rest of that scene!
__________________
Fraxum is offline   Reply With Quote
Old 01-19-2011, 08:21 AM   #4
Snake Slayer

 
Snake Slayer's Avatar
 
Drives: Awaiting 2014 C7
Join Date: Sep 2009
Location: Sunshine State
Posts: 904
Quote:
Originally Posted by Fraxum View Post
I have searched and read many threads on LTs and high flow cats. I am talking about just these mods versus each other with no tune. I found this:
  • LTs + high flow cats = 25 RWHP
  • High flow cats with stock manifolds = 20-22 RWHP

So LTs are worth 3-5 HP? Of course we are not comparing the same cats. And then I see if you add a tune to either you see around another 6-8 RWHP.

Do I have this wrong? Are we adding LTs mostly for sound?
Yes and no LT plus Cat will net 25-30 RWHP untuned. A tuned setup can produce as much as 50rwhp.
Snake Slayer is offline   Reply With Quote
Old 01-19-2011, 08:39 AM   #5
The Stig
knows 2 facts about ducks
 
The Stig's Avatar
 
Drives: ...and they're both wrong
Join Date: Aug 2009
Location: The HMS Invincible
Posts: 26,675
Quote:
Originally Posted by Fraxum View Post
Yes I was wondering the amount of the difference.

BTW you have one of the best sigs here. It would be great to see the rest of that scene!
Thanks, unfortunately I don't have the rest of the pic
__________________
Click to view my build thread
The Stig is offline   Reply With Quote
Old 01-19-2011, 10:07 PM   #6
Fraxum


 
Fraxum's Avatar
 
Drives: 2013 TT IOM 1LE
Join Date: Jan 2010
Location: South NJ
Posts: 3,139
Send a message via AIM to Fraxum
Quote:
Originally Posted by Snake Slayer View Post
Yes and no LT plus Cat will net 25-30 RWHP untuned. A tuned setup can produce as much as 50rwhp.
I could be wrong But I have not seen a tune pick up 20-25 HP on just LTs+Cats no CAI, no ported TB.

My point is here that the big gain is from the cats. With your example the LT+Cats advantage over just high flow cats is between 5-8 RWHP. (20-22 versus 25-30). I assume the tune would pick up some HP on just high flow cats too.

I am questioning if LTs are all that on a bolt on car. I know a cam, stroker, or FI car will benefit. Wondering if it is worth the $$ when just doing boltons. Say you buy the Kooks for $800 you paid $100 per hp.
__________________
Fraxum is offline   Reply With Quote
Old 01-19-2011, 10:25 PM   #7
Bad70supreme


 
Bad70supreme's Avatar
 
Drives: 2010 aqua blue SS/RS M6
Join Date: Feb 2010
Location: plainfield, IL
Posts: 2,626
If your not going to run cats, just run OBX long tubes...thats a 30rwhp bolt-on for $350! I know some people flame them but for a guy like me not made of cash, thats a hard deal to beat! Those headers my not be the best quality, but they are just headers its not a moving part like a rocker arm! Those headers and a Ls9 cam is 50hp at the wheels for 550$ and your labor, thats my plan
__________________
217/228 .565 cam, th400 swap with 3600 stall, headers, GPI tune, VR intake, Bo white TB
11.63@ 118.6
11.66@ 119.5
Bad70supreme is offline   Reply With Quote
Old 01-20-2011, 11:28 PM   #8
Fraxum


 
Fraxum's Avatar
 
Drives: 2013 TT IOM 1LE
Join Date: Jan 2010
Location: South NJ
Posts: 3,139
Send a message via AIM to Fraxum
Quote:
Originally Posted by Bad70supreme View Post
If your not going to run cats, just run OBX long tubes...thats a 30rwhp bolt-on for $350! I know some people flame them but for a guy like me not made of cash, thats a hard deal to beat! Those headers my not be the best quality, but they are just headers its not a moving part like a rocker arm! Those headers and a Ls9 cam is 50hp at the wheels for 550$ and your labor, thats my plan
I like the OBX, no bashing here. If I go LTs a low priced one will be my choice.

But my thoughts here are the LTS are not as responsible for most of the gain. The high flow cats are.
__________________
Fraxum is offline   Reply With Quote
Old 01-21-2011, 11:20 AM   #9
JANNETTYRACING
PRESIDENT CALIBRATOR JRE

 
JANNETTYRACING's Avatar
 
Drives: YELLOW 2013 ZL1 AUTO
Join Date: Jun 2009
Location: ON THE DYNO WATERBURY CT.
Posts: 9,856
Quote:
Originally Posted by Fraxum View Post
I have searched and read many threads on LTs and high flow cats. I am talking about just these mods versus each other with no tune. I found this:
  • LTs + high flow cats = 25 RWHP
  • High flow cats with stock manifolds = 20-22 RWHP

So LTs are worth 3-5 HP? Of course we are not comparing the same cats. And then I see if you add a tune to either you see around another 6-8 RWHP.

Do I have this wrong? Are we adding LTs mostly for sound?
I don't believe for a minute that you will gain 20-22 RWHP buy just replacing your cats, More Like 12-15

A long Time ago in C5 world ADM made Cat Delete Pipes and found a gain of 18 at peak only.

Now We should not compare HP only at 6200 RPM

Long tube headers w high flow cats Consistantly pick up 25-28 RWHP at Peak but Gain upwards of 30 lb torque in the low and mid range over stock manifolds, THIS IS WHAT YOU FEEL on a daily driver.

Cats alone will not gain the torque that Long Tube Headers Gain.

See my Header Test results for Graphs.

Ted.
__________________
Technical information, Parts Sales, Professional Installation, and Custom Dyno Tuning.
Please vist our web sites for all your performance needs!
Ted Jannetty
Jannetty Racing Ent Inc.
2984 East Main St.
Waterbury Ct. 06705
203-753-7223
tedj@jannettyracing.com
www.jannettyracing.com
www.turboaddictionparts.com
Performance Parts
JANNETTYRACING is offline   Reply With Quote
Old 01-21-2011, 11:51 AM   #10
Mark Myles
 
Mark Myles's Avatar
 
Drives: 2010 2SS/RS IBM / Silver Stripes
Join Date: Mar 2010
Location: Northeast Michigan
Posts: 604
Thank you for clearing this up Ted.

M
Mark Myles is offline   Reply With Quote
Old 01-22-2011, 11:14 PM   #11
Fraxum


 
Fraxum's Avatar
 
Drives: 2013 TT IOM 1LE
Join Date: Jan 2010
Location: South NJ
Posts: 3,139
Send a message via AIM to Fraxum
Quote:
Originally Posted by JANNETTYRACING View Post
I don't believe for a minute that you will gain 20-22 RWHP buy just replacing your cats, More Like 12-15

A long Time ago in C5 world ADM made Cat Delete Pipes and found a gain of 18 at peak only.

Now We should not compare HP only at 6200 RPM

Long tube headers w high flow cats Consistantly pick up 25-28 RWHP at Peak but Gain upwards of 30 lb torque in the low and mid range over stock manifolds, THIS IS WHAT YOU FEEL on a daily driver.

Cats alone will not gain the torque that Long Tube Headers Gain.

See my Header Test results for Graphs.

Ted.
I guess I was believing the Solo initial test @ 22 rwhp. I have not seen an independent before and after of just Solo cats. So you are saying the LTs are worth 7-10 RWHP and some extra torque.

What would be interesting would be these tests on the same stock car and same dyno:
  • Stock
  • High flow cats
  • Shorties + high flow cats
  • LTs+High flow cats

And each of the last three with a tune. I am just saying.
__________________
Fraxum is offline   Reply With Quote
Old 01-23-2011, 12:46 PM   #12
Bad70supreme


 
Bad70supreme's Avatar
 
Drives: 2010 aqua blue SS/RS M6
Join Date: Feb 2010
Location: plainfield, IL
Posts: 2,626
High flow cats are not cheap, and yes they do add a nice power gain... but LTs out perform them in every way. I personally dont think they are worth the money unless you have to use them. Once you start to really mod the high flow cats wont cut it anymore and you will end up putting LTs on it anyway
__________________
217/228 .565 cam, th400 swap with 3600 stall, headers, GPI tune, VR intake, Bo white TB
11.63@ 118.6
11.66@ 119.5
Bad70supreme is offline   Reply With Quote
Old 01-23-2011, 01:01 PM   #13
mikeSS


 
mikeSS's Avatar
 
Drives: 2013 E92 M3
Join Date: Nov 2009
Location: MI
Posts: 7,335
Quote:
Originally Posted by Bad70supreme View Post
High flow cats are not cheap, and yes they do add a nice power gain... but LTs out perform them in every way. I personally dont think they are worth the money unless you have to use them. Once you start to really mod the high flow cats wont cut it anymore and you will end up putting LTs on it anyway
that is so true. one of the main reason why i got rid of my high flow cats is because i wanted to add a cam and also wanted more sound. high flow cats are great for what they do. but if you are going to tune you better get LTs
__________________

2010 camaro cammed- sold
2013 E92 V8 M3 DCT ZCP
C7 pending order
mikeSS is offline   Reply With Quote
 
Reply

Thread Tools

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

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Just adding High Flow Cats' What do you think? Scott@Bjorn3D Camaro V8 LS3 / L99 Engine, Exhaust, and Bolt-Ons 5 10-06-2010 12:38 PM
corsa exhaust with high flow cats... what to expect ? mikeSS Camaro V8 LS3 / L99 Engine, Exhaust, and Bolt-Ons 3 07-25-2010 04:44 PM
thinking about getting high flow cats , but have some questions mikeSS Camaro V8 LS3 / L99 Engine, Exhaust, and Bolt-Ons 1 07-22-2010 08:54 AM
*NEW* American Racing Headers w/ high flow cats jlito V8 - Engine, Exhaust, Bolt-Ons, Tuning Equipment 9 06-22-2010 12:24 PM
High Flow Cats? RickyTheStorm Camaro V8 LS3 / L99 Engine, Exhaust, and Bolt-Ons 7 07-10-2009 03:36 PM


All times are GMT -5. The time now is 05:24 AM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.