aa-cut wayyyy to small, hihelix uncut?
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aa-cut wayyyy to small, hihelix uncut?

  1. #1
    mo balls than $cents$ IMPATIENT 1's Avatar
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    Default aa-cut wayyyy to small, hihelix uncut?

    we went out saturday and tested the twin turbo tx20, started out at 23lbs of boost and it was turnin 7800 with 60psi of intake pump is tight tight, new ss amt aa-cut impellor in it, aggressor 9 vane bowl. at 15lbs of boost, its turnin 7500. so it looks like a aaa-cut or uncut hihelix is needed. you guys should feel how this thing leaves and pulls, its just sickkkkk just on 15lbs of boost, it pullls super hard

    anybody have a chart to show 7800rpm on a amt aa cut? wonder were hp is at.

    also need a oil cooler if anyone has 1, oil temp gets high after each pass.

    Dare to be different, if it turns out great you can claim you planned it that way.

    Jetboatperformance.com

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    Boat Nut sleekcrafter's Avatar
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    Time for a full race prepped impeller, off the shelf stuff ain't gonna cut it for you.
    Upper Midwest Power Boat Association
    DRAG BOAT RACING UMPBA #926


  4. #3
    mo balls than $cents$ IMPATIENT 1's Avatar
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    Quote Originally Posted by sleekcrafter View Post
    Time for a full race prepped impeller, off the shelf stuff ain't gonna cut it for you.
    its not cavitating at all, the boat has a ervin capps keel and stays loaded all the time, its just turnin the pump that hard we wanna be able to turn the motor up to 28-30lbs of boost and use the pump to hold it to 7500 at wot. its gotta a dps inducer in frt of the aa right now, so we can lose that and go to a huge impellor cut, just can't go to a big diameter impellor like we prob need too.

    Dare to be different, if it turns out great you can claim you planned it that way.

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    Senior Member jetboatperformance's Avatar
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    Tommy congrats to you and Billy , check your Pm's !

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    Resident Ford Nut Sleeper CP's Avatar
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    Just turn the boost down would ya..

    Got any MPH #'s on that baby yet ?

    S CP

    "Dark Sarcasm"
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    fast is the other half.
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    senior member turbo wog's Avatar
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    how many ci & what size turbos ya running ? i just ordered a couple myself

  9. #7
    mo balls than $cents$ IMPATIENT 1's Avatar
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    Quote Originally Posted by jetboatperformance View Post
    Tommy congrats to you and Billy , check your Pm's !
    thanx, ole mota is just insannnneeeeee!
    pm'd ya back. he's gonna have to sell his pump to get rid of the jetaway, its gonna snap the shaft again if he don't. gonna sell the pump as a unit(dominator suction housing with new ss amt aa impellor/bronze ring/dps jetaway/dps inducer/fresh seals/fresh lube in the jetaway/shaft ) then go to the biggest damn impellor he can get for it, turn the boost up and let r eat
    he can't run a jetaway of any kind because where the shaft has to be cut for the pilot bearing, it'll snap the shaft at that weak spot. don't matter what kinda shaft he uses, with this much hp and a huge impellor, all it takes is 1 unload over 100mph and reloading hard will snap the shaft of driveshaft in the boat.

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    senior member turbo wog's Avatar
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    i had seen a dan olson oil cooler in parts section not too long ago.

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    mo balls than $cents$ IMPATIENT 1's Avatar
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    Quote Originally Posted by turbo wog View Post
    how many ci & what size turbos ya running ? i just ordered a couple myself
    496, twin 75mm bullseye

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    Senior Member Futs's Avatar
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    You would be surprised at what a good detail job to an impellor will do. It will pull some rpm out and launch even harder.

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    mo balls than $cents$ IMPATIENT 1's Avatar
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    Quote Originally Posted by Sleeper CP View Post
    Just turn the boost down would ya..

    Got any MPH #'s on that baby yet ?

    S CP
    now why would he wanna do that? we want to run the dang thing, not keep it turned down

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    senior member turbo wog's Avatar
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    Quote Originally Posted by IMPATIENT 1 View Post
    496, twin 75mm bullseye
    awsome ! i just got some 72mm (not arrived yet)can't wait to see some results. do they spool instantly? is there a little lag? what a/r ratio you running?do you know the turbine size ?or any other specs? what is your estimated hp?

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    Quote Originally Posted by turbo wog View Post
    awsome ! i just got some 72mm (not arrived yet)can't wait to see some results. do they spool instantly? is there a little lag? what a/r ratio you running?do you know the turbine size ?or any other specs? what is your estimated hp?
    nooooo lag 1.32 ar, forgot turbine size i know the wheel is 75mm. 2000+hp?? not sure, let's just say its just got stupid hp/tq

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    Senior Member DuaneHTP's Avatar
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    Impatient 1
    dps jetaway
    dps did not make a Jetaway, He made a rachet'

    he can't run a jetaway of any kind because where the shaft has to be cut for the pilot bearing, it'll snap the shaft at that weak spot.
    Only the DPS rachet requires for the shaft to be cut and drilled for a pilot hole. And yes, it weakens the shaft. The Jetaway has a splined collar that slips over the shaft and increases the shock load capabalities of the shaft by 28%. This eliminates the twisted off shafts. Give me a call, I'll explain. 417-858-8616.

    I also have a bowl available, that will let you run a 9 1/2" Hi-Helix if you want to.

    Duane HTP

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