budget twin turbo 460 jet boat project
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budget twin turbo 460 jet boat project

  1. #1
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    Default budget twin turbo 460 jet boat project

    I bought this boat in 2009 when I was in Carson City NV for work....pulled it from Santa Cruz CA to Carson City....It hadnt run in 10 years. Did the normal stuff to get it running...tune up, battery, oil change, carb rebuilds, some wiring etc...enjoyed it out there a few times and pulled it back to Wisconsin and enjoyed it for a few years just putting fuel in it and changing oil. Super mild 460....turned a single A impeller 4800 RPM....so around 400 HP.

    2013 it bent a couple pushrods and i did a compression check...low compression in a few cylinders...pulled heads....cracked heads as well...no money to fix it at the time.

    Winter 2015...scored an ultra low buck 460 on craigslist because of a cracked block (leaked externally due to freezing)....fresh heads...roller rockers...speedpro flat top pistons, h beam rods, Comp xtreme energy 4x4 cam. I took the gamble and filled the crack with a special epoxy. Dropped the engine in spring of 2015 (along with the manifold, valve covers and a few other bits being polished and clear powdercoated) and have enjoyed it all summer with zero issues....makes about the same power as the previous one.

    My plan is to low buck twin turbo this engine for 750 hp at 13 lbs on pump gas...use the old engine for mock up and build a spare as money allows...Im slowly buying parts used or for "deals"...planned combo is as follows:

    -Present ~9:1 460
    -present Dominator jet pump with an Aggressor AA bronze impeller-->acquired...should absorb 750 HP at about 5400 RPM
    -used for mock up twin GT45 turbos --> on their way off racing junk
    -wastegates have not be scored yet...if I cant find used I will buy new twin JGS 50's
    -Water cooled center riser exhaust manifolds--> acquired...make an adapter pipe for wastegate and convert to turbo flange
    -CX racing air/water intercooler, twin inlet single outlet, two cores--> acquired
    -Microsquirt-->acquired
    -LS coils-->need to grab from junkyard
    - 80 lb injectors--> need yet
    -twin 044 bosch pumps--> need yet

    Convert present tunnel ram to EFI by putting spacers (with injector holes drilled) between the upper and lower parts. Using the present 450 holleys as throttle bodies...unsure what Im going to use for a bonnet or hat yet....the carbs are spaced 9 7/8" on center

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  3. #2
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    started messing around mocking up the manifolds and turbos....

    I plan on making a flange that bolts to the manifold outlet...then drilling/tapping holes to get the water out of the manifold water jackets. The flange will also serve to make an extension pipe in so I can plumb in the wastegates and angle the turbine inlet flanges to align the center line of the turbos symmetric about the center of the engine...not real progress but Im starting to fart around with it...I didnt have much time this weekend.

    Things that are great about these manifold:
    -cheap
    -compact and fit tight to the engine
    -semipolished finish
    -turbo pattern damn near bolted on....doesnt really matter...I cannot bolt the turbo to the manifold directly anyway
    -watercooled so I dont fry everything around them....but also takes away some exhaust energy


    Things I am concerned about with using these manifolds:
    -only 1 bolt per exhaust port <---no real easy solution if sealing problems arise. I plan on surfacing them, torquing in center out sequence and gooping the shit out of the area with ultra copper RTV.

    -only about 3/16" between the water jacket port and exhaust area for a leak path <---can weld ports/paths shut, surface, then drill and tap exterior of manifold to get water out

    -5/16" studs for clamping on manifold exit <--- drill and tap for 3/8" if there is enough "meat"

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    Little progress...some direct...some indirect.

    1. Got my Grandfathers old South Bend bench top lathe working....not fancy but it makes chips...only three speeds...and the auto feed and thread cutting mechanism is not connected

    2. Cut up an old duraspark distributor to make an oil pump drive...need to end drill the shaft so I can thread a bolt into it for a end stop from the top and shim it.

    3. Got the manifold flanges waterjetted locally...way easier than me cutting 1/2" steel plate with a torch and grinding forever..was quite impressed with the price and turn around time (~$150 for 4 flanges and I simply dropped of the manifold for them to measure and a sketch of what i wanted...3 days turnaround)...had a spare set made in case I mess the first set up

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    Coils mounted
    Fuel injector harness made
    Junk yard scores for connectors
    Crank sensor bracket made
    Cylinder Head Temperature sensor drilled and tapped in mock up engine...no break through...should work for "real" engine
    Right turbo up pipe tacked together....not sure that I like the turbo that high up....but in need room for the wastegate so it doesnt hit the valve cover.

    I need to order injectors/pump/regulator as well as the spacers for the tunnel ram for locating the injectors...and a host of other small stuff.

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    Coils

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    Pics for completed hotside...I plan on adding some braces

    1. From the manifold exit flange to the turbine inlet flange
    2. From the manifold exit flange to the wastegate inlet flange
    3. from the back of the cylinder heads up to the "downpipes"

    The angle of the "downpipes" is intentional so they should be level with the water and the ends should be flush with the back of the transom when it is in the boat.

    Also, the third pic is a rough representation of my plan for making the carb/throttle body bonnet.

    I also made the ignition coils' harness.

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    Finished:
    carb hat
    braces for the turbos
    made a water manifold on top of the exhaust adapters plate to get the water out
    drilled the fuel rails
    drilled the injector holes in the spacers
    mounted the fuel rails
    welded the trigger wheel to the crank spacer

    Need to:
    plumb fuel system
    install crank trigger wheel on engine
    drill CHT sensor hole on engine
    mount and wire the microsquirt
    mount and wire the wideband
    mount intercooler
    install turbo piping on engine in boat

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  8. #6
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    I took next week off so hopefully i can get this thing wrapped up....there is a shoot out I want to go to next weekend (Three Lakes Shootout & Fly-In) ....should be a good time

    well...I didnt get it done in time...riser flanges warped when I welded them and I had to have them machined. So I went to the races anyway to watch and booze it up with friends. Attached are some pics of the set up in the boat. I need to:

    -make charge pipes
    -plumb water side of intercooler
    -pick up weldments from the machine shop from being surfaced
    -flush fuel systemj
    -load firmware and my first shot in the dark at a tune
    -try to start

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    well.....It runs!!...I have it starting consistently hot and cold in the driveway on the hose.....Im going to drop it in the drink this weekend and hopefully get it tuned further...tough to read the laptop screen in the sun light.

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  9. #7
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    Posts above are cliff notes from my build thread on theturboforums....http://www.theturboforums.com/threads/381034-18-Nordic-TT460-Microsquirt-on-the-cheap/page3

    just though some maybe interested over here. Its simply a fun lake toy to have fun with and use the turbos to whistle at the ladies...lol


    plan is to get it functional this year (should be dropping it in the water this weekend for tuning under load).....and then coat and clean up everything over the winter
    Last edited by SS496; 07-20-2016 at 11:13 AM.

  10. #8
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    well its running nice...have only put about 4 lbs of boost through it so far....baby steps...some pictures from the past weekend...took my mom for a joy ride
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  11. #9
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    add some more pics since they ones I copied/linked didnt work
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  12. #10
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    Nice looking setup. Thanks for the write up

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