What Size Primary For Twin Ls1?
10-26-2004, 10:20 AM
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What Size Primary For Twin Ls1? I am building a set of twin turbo headers for an LS1. They only needto make about 1000 fwhp max. I am assuming a 1 3/4 primary is adequate? What wall thickness? What are you 1000 hp guys using? Thanks.
10-26-2004, 02:51 PM
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Right now my motor that I sold makes 650 on pumpgas alone! With unported heads! 1000 horse with a twin turbo setup is nothing compared to that. That is a 350 hp increase from what can easily be done on motor only! Granted I will be using an ls1, but I am looking just to double the hp it will produce on motor and was asking for other people with the same setups to give advice on what they use, not some comments messing up my thread. So unless you have an answer to my question, don't comment. Thanks.
Also, Besides primary size and wall thickness, anyone who has built twin headers already, how many of what bends did you go through, I am trying to figure out what to order. Thanks.
Also, Besides primary size and wall thickness, anyone who has built twin headers already, how many of what bends did you go through, I am trying to figure out what to order. Thanks.
10-26-2004, 05:11 PM
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FWHP what the hell is that? I know what RWHP is.
Get 8 U (or is it J) bents from Stainless this is 16 90degrees bents witch should cover u but u never know how many times u will make a mistake.
Get 8 U (or is it J) bents from Stainless this is 16 90degrees bents witch should cover u but u never know how many times u will make a mistake.
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10-26-2004, 06:17 PM
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Originally Posted by smokinHawk
ask y2khawk
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1966 Chevy II twin turbo LS3 project
2016 Z07 Carbon
1966 Chevy II twin turbo LS3 project
2016 Z07 Carbon
10-26-2004, 06:41 PM
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Great, thats what I wanted to hear. So you figure about 8 U-bends... What radius? What did Y2KHAWK end up using as far as bends? I am just gonna whip together a cheap ls1 with some billet rods and some dished pistons over the winter. I am going to try to build a 1000 hp pumpgas 347" motor. I had a 427" motor that was identical to Monty william's motor that had 2 pt-52's and made 1200 hp on pumpgas. Now I will just try with smaller cubes. I am planning on trying 8:1 or less compression to see how far pumpgas will go! Figured it will be a good winter project. Thanks for the replys.
10-26-2004, 07:37 PM
#11
Originally Posted by goober35
FWHP what the hell is that? I know what RWHP is.
Get 8 U (or is it J) bents from Stainless this is 16 90degrees bents witch should cover u but u never know how many times u will make a mistake.
Get 8 U (or is it J) bents from Stainless this is 16 90degrees bents witch should cover u but u never know how many times u will make a mistake.
10-27-2004, 05:15 AM
#13
i think Harlan go this at burns stainless. there are other mandrel bend places as well, i think even summit and jegs have them.
http://www.stainlessworks.net/ a sponser here has them to
http://www.stainlessworks.net/ a sponser here has them to
10-27-2004, 09:22 PM
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I just finished fabricating mine for my TT427 Chevy 2 project. They are .065" 321 1 3/4" tubes. I would stick with 1 3/4" over 1 5/8". If you run over 14.7 psi of boost you effectively are doubling the displacement of the motor. That equates to a lot of exhaust to relieve.
Just make sure your turbos are properly sized for the displacement and primary size!
I bought all my material from BURNS STAINLESS as well. Nice stuff!
Just make sure your turbos are properly sized for the displacement and primary size!
I bought all my material from BURNS STAINLESS as well. Nice stuff!
10-28-2004, 11:58 AM
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I actually used less material then what I bought. I think I ended up using 8 2.5" CLR U-bends, 3 4.0" CLR U-bends and about 6 pieces of 24" long straight tubing.
The merge collectors are where the big money is!
The merge collectors are where the big money is!
