Ported manifold and boost?
Thread Starter
TECH Resident
iTrader: (22)
Joined: Oct 2006
Posts: 910
Likes: 0
From: Shreveport, Louisiana
Ported manifold and boost? I'm trying to decide if I want to spend the money to have my stock LS2 manifold ported or not. I am using stock casting 317 heads, but have some bowl blending work, new valves and a comp. valve job that will help flow so and I would like to think the ported manifold would help a good bit.
Say a "radically" ported LS2 manifold picks up 15-20rwhp in a NA application, how much (estimated) can be picked up in a boosted application with the same manifold?
Anyone ever done this with some results?
Say a "radically" ported LS2 manifold picks up 15-20rwhp in a NA application, how much (estimated) can be picked up in a boosted application with the same manifold?
Anyone ever done this with some results?
Thread Starter
TECH Resident
iTrader: (22)
Joined: Oct 2006
Posts: 910
Likes: 0
From: Shreveport, Louisiana
I knew the argument about adding a psi of boost would come up. The thing with the LS2 manifold is that there are tons of rough edges and it flows terribly. I guess the goal is to have as much power with the least amount of boost because I do have stock casting heads and want to keep them down. I also don't want to have to run 18+ psi to achieve my goals because of the APS turbos.
It sounds like I'm talking myself into it....
I guess I just wanted to know what kind of gains could be expected if it makes 15-20rw on NA setups.
Thanks for the input, BTW.
The company states that removing the posts does not weaken it, and that they are only there to align the pieces during GM's sealing/mating process.
I knew the argument about adding a psi of boost would come up. The thing with the LS2 manifold is that there are tons of rough edges and it flows terribly. I guess the goal is to have as much power with the least amount of boost because I do have stock casting heads and want to keep them down. I also don't want to have to run 18+ psi to achieve my goals because of the APS turbos.
It sounds like I'm talking myself into it....
I guess I just wanted to know what kind of gains could be expected if it makes 15-20rw on NA setups.
Thanks for the input, BTW.
I knew the argument about adding a psi of boost would come up. The thing with the LS2 manifold is that there are tons of rough edges and it flows terribly. I guess the goal is to have as much power with the least amount of boost because I do have stock casting heads and want to keep them down. I also don't want to have to run 18+ psi to achieve my goals because of the APS turbos.
It sounds like I'm talking myself into it....
I guess I just wanted to know what kind of gains could be expected if it makes 15-20rw on NA setups.
Thanks for the input, BTW.
Nothing wrong with efficiency goals. "In theory" anything that you can do to create more na power wil equate to more power under boost at the same or lower psi.......
I just have not been impressed with gains/ no gains with stock style intake manifold changes with boost. Some see gains....I have not.
Thread Starter
TECH Resident
iTrader: (22)
Joined: Oct 2006
Posts: 910
Likes: 0
From: Shreveport, Louisiana
Well, yes. I knew that LOL
When they are ported really well, they flow better than the beloved LS6, yes?
Problem is, its either port it or use it stock. I used in it my previous LS6 combo with stock heads and the stock APS turbos and made ~750rwhp.
When they are ported really well, they flow better than the beloved LS6, yes?
Problem is, its either port it or use it stock. I used in it my previous LS6 combo with stock heads and the stock APS turbos and made ~750rwhp.
Thread Starter
TECH Resident
iTrader: (22)
Joined: Oct 2006
Posts: 910
Likes: 0
From: Shreveport, Louisiana
Have they pressure tested a manifold to 20psi after porting it or do they just "think" is does not weaken it.
Nothing wrong with efficiency goals. "In theory" anything that you can do to create more na power wil equate to more power under boost at the same or lower psi.......
I just have not been impressed with gains/ no gains with stock style intake manifold changes with boost. Some see gains....I have not.
Nothing wrong with efficiency goals. "In theory" anything that you can do to create more na power wil equate to more power under boost at the same or lower psi.......
I just have not been impressed with gains/ no gains with stock style intake manifold changes with boost. Some see gains....I have not.
Trending Topics
LS2 intake is a multilayer and the layers separate under boost (no more smooth edges). LS6 is far superior in a boosted application.
LS1 Tech Stories
The Best V8 Stories One Small Block at Time
6 Common C5 Corvette Failures and What's Involved In Repairing Them
Pouria Savadkouei
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph
Verdad Gallardo
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked
Pouria Savadkouei
Top 10 Most Powerful Chevy Trucks Ever Made!
Hennessey's New Supercharged Silverado ZR2 Has 700 HP
Verdad Gallardo
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes
Verdad Gallardo
Awesome K5 Blazer Restomod Comes With C7 Corvette Power
Verdad Gallardo
10 Camaros You Should Never Buy
10 LS Engine Myths That Refuse to Die
Verdad Gallardo Thread Starter
TECH Resident
iTrader: (22)
Joined: Oct 2006
Posts: 910
Likes: 0
From: Shreveport, Louisiana
can't the layers be glued like the FAST? I to am looking into a ported LS2 myself because they cost as much as an LS6 an out perform from what I've read
Thread Starter
TECH Resident
iTrader: (22)
Joined: Oct 2006
Posts: 910
Likes: 0
From: Shreveport, Louisiana
FWIW, I know a couple C5 guys with ported LS2 manifolds that were over 900rw and 1000rw without issues. This is with around 19-20ish psi. However, note that they DID NOT have the center posts removed.
My stock ls2 intake has seen a 22psi of boost with no issues,
On the fast intakes, I have a buddy that had a 92 92 set up with boost and it leaked very badly between the two pieces, 3psi of boost was lost through the leak. He went back to the ls6 intake.
On the fast intakes, I have a buddy that had a 92 92 set up with boost and it leaked very badly between the two pieces, 3psi of boost was lost through the leak. He went back to the ls6 intake.
Thread Starter
TECH Resident
iTrader: (22)
Joined: Oct 2006
Posts: 910
Likes: 0
From: Shreveport, Louisiana
Is yours ported in the runners or the plentum?
9 Second Club
Joined: Nov 2003
Posts: 13,616
Likes: 185
From: Norn Iron
Thread Starter
TECH Resident
iTrader: (22)
Joined: Oct 2006
Posts: 910
Likes: 0
From: Shreveport, Louisiana
Thread Starter
TECH Resident
iTrader: (22)
Joined: Oct 2006
Posts: 910
Likes: 0
From: Shreveport, Louisiana
From what Ive seen they cost the came. Right now I have no intake and no tb. Knowing that the ported LS2 out flows a stock LS6 for the same price, you get the added benefit of having to use a 90mm TB. Thats just my logic anyway
Thread Starter
TECH Resident
iTrader: (22)
Joined: Oct 2006
Posts: 910
Likes: 0
From: Shreveport, Louisiana
