01-18-2011, 07:53 PM | #1 |
|
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:
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?
__________________
"Democracy Dies in Darkness" |
01-18-2011, 08:10 PM | #2 |
knows 2 facts about ducks
Drives: ...and they're both wrong Join Date: Aug 2009
Location: The HMS Invincible
Posts: 25,072
|
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.
|
01-18-2011, 08:59 PM | #3 | |
|
Quote:
BTW you have one of the best sigs here. It would be great to see the rest of that scene!
__________________
"Democracy Dies in Darkness" |
|
01-19-2011, 07:21 AM | #4 | |
Drives: Awaiting 2014 C7 Join Date: Sep 2009
Location: Sunshine State
Posts: 902
|
Quote:
|
|
01-19-2011, 07:39 AM | #5 |
knows 2 facts about ducks
Drives: ...and they're both wrong Join Date: Aug 2009
Location: The HMS Invincible
Posts: 25,072
|
Thanks, unfortunately I don't have the rest of the pic
|
01-19-2011, 09:07 PM | #6 | |
|
Quote:
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.
__________________
"Democracy Dies in Darkness" |
|
01-19-2011, 09:25 PM | #7 |
Drives: 2010 aqua blue SS/RS M6 Join Date: Feb 2010
Location: plainfield, IL
Posts: 2,706
|
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
__________________
10.91 at 122 H/C stock block N/A
|
01-20-2011, 10:28 PM | #8 | |
|
Quote:
But my thoughts here are the LTS are not as responsible for most of the gain. The high flow cats are.
__________________
"Democracy Dies in Darkness" |
|
01-21-2011, 10:20 AM | #9 | |
Drives: BLUE CAMARO ZL1 1LE M6 Join Date: Jun 2009
Location: ON THE DYNO WATERBURY CT.
Posts: 15,223
|
Quote:
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.
__________________
www.jannettyracing.com
Celebrating 37 years Performance parts, Installation, Fabrication, Dyno tuning, Remote custom tuning, and alignments. 203-753-7223 Waterbury CT. 06705 email tedj@jannettyracing.com |
|
01-21-2011, 10:51 AM | #10 |
Drives: 2010 2SS/RS IBM / Silver Stripes Join Date: Mar 2010
Location: Northeast Michigan
Posts: 601
|
Thank you for clearing this up Ted.
M |
01-22-2011, 10:14 PM | #11 | |
|
Quote:
What would be interesting would be these tests on the same stock car and same dyno:
And each of the last three with a tune. I am just saying.
__________________
"Democracy Dies in Darkness" |
|
01-23-2011, 11:46 AM | #12 |
Drives: 2010 aqua blue SS/RS M6 Join Date: Feb 2010
Location: plainfield, IL
Posts: 2,706
|
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
__________________
10.91 at 122 H/C stock block N/A
|
01-23-2011, 12:01 PM | #13 | |
Drives: 2015 c7 Join Date: Nov 2009
Location: MI
Posts: 7,462
|
Quote:
|
|
|
|
|
|
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 11:38 AM |
corsa exhaust with high flow cats... what to expect ? | mikeSS | Camaro V8 LS3 / L99 Engine, Exhaust, and Bolt-Ons | 3 | 07-25-2010 03:44 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 07:54 AM |
*NEW* American Racing Headers w/ high flow cats | jlito | V8 - Engine, Exhaust, Bolt-Ons, Tuning Equipment | 9 | 06-22-2010 11:24 AM |
High Flow Cats? | RickyTheStorm | Camaro V8 LS3 / L99 Engine, Exhaust, and Bolt-Ons | 7 | 07-10-2009 02:36 PM |