Header/stock manifold questions
03-10-2008, 07:13 PM
#1
Header/stock manifold questions I have LT's on my car because I had read we needed them...
I just met a tech who told me that I wasted my money because the 2001 and 2002 LS1 got a better flowing exhaust manifold that was designed after the vets and the stock manifold flows as well as shorties and stock cats flow almost as well as aftermarket high-flow cats.
He said that my LT's and aftermarket cats have not neeted me more that 10 HP over what the stock mainfolds would have...and that they would hold up for the life of the car unlike my stainless headers.
I know that my lid, filter, ported maf and TB for the intake, the cam, springs, retainers amd rockers, built tranny w/2800 stall and the LT's, true duals have neeted me on my best pull on the dyno 373 HP, that I believe is only about 80 or so over stock.
He said the intake work, cam and duals neeted almost all the increased power and that the headers and high flow cats were less than 10 HP...and that they were not really needed unless you are trying to squeze every little bit of power out.
Is this true? and do I need to hang on to my stock manifolds because the headers will fail with time like all stainless?...and how long should I get out of stainless LT's.
Thanks in advance.
I just met a tech who told me that I wasted my money because the 2001 and 2002 LS1 got a better flowing exhaust manifold that was designed after the vets and the stock manifold flows as well as shorties and stock cats flow almost as well as aftermarket high-flow cats.
He said that my LT's and aftermarket cats have not neeted me more that 10 HP over what the stock mainfolds would have...and that they would hold up for the life of the car unlike my stainless headers.
I know that my lid, filter, ported maf and TB for the intake, the cam, springs, retainers amd rockers, built tranny w/2800 stall and the LT's, true duals have neeted me on my best pull on the dyno 373 HP, that I believe is only about 80 or so over stock.
He said the intake work, cam and duals neeted almost all the increased power and that the headers and high flow cats were less than 10 HP...and that they were not really needed unless you are trying to squeze every little bit of power out.
Is this true? and do I need to hang on to my stock manifolds because the headers will fail with time like all stainless?...and how long should I get out of stainless LT's.
Thanks in advance.
03-10-2008, 09:52 PM
#2
On The Tree
iTrader: (1)
Join Date: Feb 2008
Location: Lincoln, Ne
Posts: 182
Likes: 0
Received 0 Likes
on
0 Posts
Is this "tech" fresh out of community college? I wouldn't let him within 10 miles of my car.
First of all, with your mods LTs probably netted you at LEAST 30 rwhp. Secondly, unlike cast iron, stainless doesn't rust and should last the life of the car.
First of all, with your mods LTs probably netted you at LEAST 30 rwhp. Secondly, unlike cast iron, stainless doesn't rust and should last the life of the car.
03-10-2008, 10:39 PM
#4
11 Second Club
iTrader: (32)
Join Date: Jan 2006
Location: Southaven, MS (near Memphis, TN)
Posts: 3,701
Likes: 0
Received 2 Likes
on
2 Posts
Wow..he is obviously a moron.
I have had 3 LSx cars.. (2 Camaro and one GTO) And I installed long tube headers on all of them... and all of them gained around 25-28rwhp.
I have had 3 LSx cars.. (2 Camaro and one GTO) And I installed long tube headers on all of them... and all of them gained around 25-28rwhp.
03-10-2008, 11:37 PM
#5
TECH Fanatic
iTrader: (9)
Join Date: Dec 2004
Location: Schaumburg, IL
Posts: 1,693
Likes: 0
Received 0 Likes
on
0 Posts
Most General Auto techs I've met know very little about the performance end of Autos. I'd just listen to him but not take what he says too seriously. He is right that the 01-02's got better flowing manifolds which are pretty close to shortys but still no where near the power gain of a Lt header.
03-10-2008, 11:39 PM
#6
Banned
Join Date: Sep 2007
Location: Chandler, Az
Posts: 698
Likes: 0
Received 0 Likes
on
0 Posts
I have LT's on my car because I had read we needed them...
I just met a tech who told me that I wasted my money because the 2001 and 2002 LS1 got a better flowing exhaust manifold that was designed after the vets and the stock manifold flows as well as shorties and stock cats flow almost as well as aftermarket high-flow cats.
He said that my LT's and aftermarket cats have not neeted me more that 10 HP over what the stock mainfolds would have...and that they would hold up for the life of the car unlike my stainless headers.
I know that my lid, filter, ported maf and TB for the intake, the cam, springs, retainers amd rockers, built tranny w/2800 stall and the LT's, true duals have neeted me on my best pull on the dyno 373 HP, that I believe is only about 80 or so over stock.
He said the intake work, cam and duals neeted almost all the increased power and that the headers and high flow cats were less than 10 HP...and that they were not really needed unless you are trying to squeze every little bit of power out.
Is this true? and do I need to hang on to my stock manifolds because the headers will fail with time like all stainless?...and how long should I get out of stainless LT's.
Thanks in advance.
I just met a tech who told me that I wasted my money because the 2001 and 2002 LS1 got a better flowing exhaust manifold that was designed after the vets and the stock manifold flows as well as shorties and stock cats flow almost as well as aftermarket high-flow cats.
He said that my LT's and aftermarket cats have not neeted me more that 10 HP over what the stock mainfolds would have...and that they would hold up for the life of the car unlike my stainless headers.
I know that my lid, filter, ported maf and TB for the intake, the cam, springs, retainers amd rockers, built tranny w/2800 stall and the LT's, true duals have neeted me on my best pull on the dyno 373 HP, that I believe is only about 80 or so over stock.
He said the intake work, cam and duals neeted almost all the increased power and that the headers and high flow cats were less than 10 HP...and that they were not really needed unless you are trying to squeze every little bit of power out.
Is this true? and do I need to hang on to my stock manifolds because the headers will fail with time like all stainless?...and how long should I get out of stainless LT's.
Thanks in advance.
Trending Topics
06-16-2008, 10:59 AM
#11
Hate to bring this up but I am also curious about this. I did see a dyno graph of the Vette manifolds vs. 1 3/4 and 1 7/8 where the gains were only 8 HP or so. Really curious how much LT's would gain over manifolds on my 02. Seems I saw another dyno graph saying 10 HP.
06-16-2008, 12:01 PM
#12
Hate to bring this up but I am also curious about this. I did see a dyno graph of the Vette manifolds vs. 1 3/4 and 1 7/8 where the gains were only 8 HP or so. Really curious how much LT's would gain over manifolds on my 02. Seems I saw another dyno graph saying 10 HP.
06-16-2008, 03:56 PM
#15
On The Tree
iTrader: (1)
Join Date: Feb 2007
Location: SE Florida
Posts: 199
Likes: 0
Received 0 Likes
on
0 Posts
A couple of years ago after I put on my Bassani ORY, some fellow fbody club members had a dyno day, and a buddy with same mods w/ LT and cat back, only dynoed 8hp more than me. So I think on just a bolt-on car LT not a big gain but w/ cam and or heads done you will need headers to breath.
06-16-2008, 04:34 PM
#16
A couple of years ago after I put on my Bassani ORY, some fellow fbody club members had a dyno day, and a buddy with same mods w/ LT and cat back, only dynoed 8hp more than me. So I think on just a bolt-on car LT not a big gain but w/ cam and or heads done you will need headers to breath.
06-16-2008, 09:13 PM
#17
Unless I am reading this wrong it was 18 HP tune and Kooks over stock manifolds untuned.
https://ls1tech.com/forums/dynamometer-results-comparisons/932580-dyno-results-full-exhaust-then-pulley.html
https://ls1tech.com/forums/dynamometer-results-comparisons/932580-dyno-results-full-exhaust-then-pulley.html
06-16-2008, 09:52 PM
#18
Unless I am reading this wrong it was 18 HP tune and Kooks over stock manifolds untuned.
https://ls1tech.com/forums/showthread.php?t=932580
https://ls1tech.com/forums/showthread.php?t=932580
06-16-2008, 10:38 PM
#20
Here is where the Vette iron manifolds made within a couple of HP of any tube header size made:
http://www.carcraft.com/techarticles...est/index.html
How they compare to the TA and Camaro manifolds I have no idea. If I could fit them on my car I would!
http://www.carcraft.com/techarticles...est/index.html
How they compare to the TA and Camaro manifolds I have no idea. If I could fit them on my car I would!