New 454 single turbo EFI build
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New 454 single turbo EFI build

  1. #1
    Can you prove it cabron? TSR2626's Avatar
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    Default New 454 single turbo EFI build

    Hey guys and/or girls, Ive been reading threads all over the net and the people here really seem to know there stuff when it comes to turbo jet boats. I’m a new member to the site but have read a lot of the threads. Been playin with jet boats for about 10 years n have finally decided to go with an EFI single turbo setup on my ’78 Cobra Craft. I’d like to get some input on selection of Turbo, cam, wastegate, POV, Bonnet, Intercooler, ect from people with experience. This is my first Turbo build and here’s what ive got so far.
    Engine – BBC 454, 118cc rect. Iron heads 2.19 int. 1.88 ex. open chamber, 1053 forged crank, gm forged pistons (3999295 casting) 9.25:1 with my heads I believe. 7/16 forged rods, ARP rod bolts/ head studs. Crower cutaway solid roller lifters.
    FAST XFI red box 160#/hr injectors, 2150 cfm throttle body. The goal is 1000 hp/torque at a reasonable rpm like 5800. it’d be awesome to get some ideas from some pros – Haas, Info, Unchained, GN7, I’m sure uv got ideas.

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    LP-25.com Infomaniac's Avatar
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    Single turbo = a lot of hot exhaust pipes.
    If For Some Reason I Do Something Worthy Of Recognition. God Provided The Ability And Deserves The Credit.


    QE 439 Twin Turbo

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    Can you prove it cabron? TSR2626's Avatar
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    too hot even with a t6 flange like a garrett gt4788?

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    LP-25.com Infomaniac's Avatar
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    Where are you going to put the turbo? Every cylinder will have to feed it. That is a lot of hot pipe around the engine.
    If For Some Reason I Do Something Worthy Of Recognition. God Provided The Ability And Deserves The Credit.


    QE 439 Twin Turbo

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    Can you prove it cabron? TSR2626's Avatar
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    oh yea forgot to mention E85

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    Can you prove it cabron? TSR2626's Avatar
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    was thinkn bout using logs and fab a y pipe to mount right behind the engine. my pump is not set back

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    Senior Member EVILFORCE's Avatar
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    1000 hp on stock gm stuff. I think I would set back and think about it.
    No Fool Like A Old Fool is there?

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    CAPTAIN KRYLON
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    Quote Originally Posted by TSR2626 View Post
    was thinkn bout using logs and fab a y pipe to mount right behind the engine. my pump is not set back
    I am thinking of building a similar set up but much less HP (600-650) I was thinking of using the logs as well.

  11. #9
    Can you prove it cabron? TSR2626's Avatar
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    The engines gotta make close to 500 NA so 15psi should make the power I'm lookin for. U don't think forged gm stuff can handle 15lbs?

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    Taylor what kind of setup are u looking at? What turbo?

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    New here Beer:30's Avatar
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    Going with E85, I don't think 160# injectors will cut it. Some of the other guru's have more experience, but UNCHAINED had 160s running at 100%, so......

    GN7 won't be of any help to you. Your mention of EFI makes him snarl and run for the hills. He's not efficiency-savvy. Just FYI.
    Quote Originally Posted by gn7 View Post
    EFI is the wave of the future. There can be no denying it. Electronics have been on the leading edge of our entire lives. Not only os the magneto dead, but the standard issue CDI is wavering. Its all about total fuel, air AND spark control. Anybody that thinks its not has their head up their ass.


    2001 SleekCraft 30' Heritage SSB, open-bow mid-cuddy. 496HO / Bravo-I.

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    CAPTAIN KRYLON
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    Quote Originally Posted by TSR2626 View Post
    Taylor what kind of setup are u looking at? What turbo?
    I have no real clue yet. I am just starting to learn. I am a nitrous guy. My goal is a single mounted on the rear, home made Y pipe to the logs is the idea.
    I am currently spinning an Agressor A impeller 4400 rpm with logs and 4600 rpm with open headers. I would like to spin it 53-5400 rpm

    A Borg Warner S475 has been reccomended to me I just don't know any better yet.

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    Can you prove it cabron? TSR2626's Avatar
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    Ya the 160's might not be enough but I think unchained is makin lotsa power n boost. The injector rehab calculator says I need 149#s at 80% for 1000hp. But this my first crack at E85 I like the EFI myself it's so easy to make changes.

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    New here Beer:30's Avatar
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    Quote Originally Posted by TSR2626 View Post
    Ya the 160's might not be enough but I think unchained is makin lotsa power n boost. The injector rehab calculator says I need 149#s at 80% for 1000hp. But this my first crack at E85 I like the EFI myself it's so easy to make changes.
    EFI is definitely the safe way to go. Plus, none of the headaches of carbs.
    Quote Originally Posted by gn7 View Post
    EFI is the wave of the future. There can be no denying it. Electronics have been on the leading edge of our entire lives. Not only os the magneto dead, but the standard issue CDI is wavering. Its all about total fuel, air AND spark control. Anybody that thinks its not has their head up their ass.


    2001 SleekCraft 30' Heritage SSB, open-bow mid-cuddy. 496HO / Bravo-I.

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