aa-cut wayyyy to small, hihelix uncut?

18786 Views 165 Replies 35 Participants Last post by schick, Sep 10, 2011

IMPATIENT 1

Discussion Starter · Jul 21, 2009

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

devil 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

grn

grn just on 15lbs of boost, it pullls super hard

devil

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.

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sleekcrafter

· #2 · Jul 21, 2009

Time for a full race prepped impeller, off the shelf stuff ain't gonna cut it for you.

IMPATIENT 1

Discussion Starter · #3 · Jul 21, 2009

sleekcrafter said:
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

grn 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.

jetboatperformance

· #4 · Jul 21, 2009

Tommy congrats to you and Billy , check your Pm's !

Sleeper CP

· #5 · Jul 21, 2009

Just turn the boost down would ya..

Got any MPH #'s on that baby yet ?

S CP

turbo wog

· #6 · Jul 21, 2009

how many ci & what size turbos ya running ? i just ordered a couple myself

IMPATIENT 1

Discussion Starter · #7 · Jul 21, 2009

jetboatperformance said:
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

grn
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.

turbo wog

· #8 · Jul 21, 2009

i had seen a dan olson oil cooler in parts section not too long ago.

IMPATIENT 1

Discussion Starter · #9 · Jul 21, 2009

turbo wog said:
how many ci & what size turbos ya running ? i just ordered a couple myself

496, twin 75mm bullseye

Futs

· #10 · Jul 21, 2009

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.

IMPATIENT 1

Discussion Starter · #11 · Jul 21, 2009

Sleeper CP said:
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

turbo wog

· #12 · Jul 21, 2009

IMPATIENT 1 said:
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?

IMPATIENT 1

Discussion Starter · #13 · Jul 21, 2009

turbo wog said:
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

DuaneHTP

· #14 · Jul 21, 2009

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

IMPATIENT 1

Discussion Starter · #15 · Jul 21, 2009

DuaneHTP said:
Impatient 1

dps did not make a Jetaway, He made a rachet'

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. Duane HTP

ohhhh, good to know

he's already snapped a shaft last summer, and i'm sure you know where it snapped

sphss

turbo wog

· #16 · Jul 21, 2009

IMPATIENT 1 said:
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

so as your'e plaining out or poping up ontop of the water you have full boost?????

??? wow . i think my turbos are too small

i told them i wanted instant boost & they put me in the 72 mm & estimated @1350hp...if i get the motor enough fuel . how r u getting fuel ? mech injection? i am worried my cam ain't gonna cut it either . if your cam is not a secret i would like to know what u r runnin .

IMPATIENT 1

Discussion Starter · #17 · Jul 21, 2009

2

turbo wog said:
so as your'e plaining out or poping up ontop of the water you have full boost???????? wow . i think my turbos are too small i told them i wanted instant boost & they put me in the 72 mm & estimated @1350hp...if i get the motor enough fuel . how r u getting fuel ? mech injection? i am worried my cam ain't gonna cut it either . if your cam is not a secret i would like to know what u r runnin .

blow thru carb, aeromotive belt drive fuel pump, 13202 aeromotive regulator with bypass

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IMPATIENT 1

Discussion Starter · #18 · Jul 21, 2009

that steel crank pulley blew to shitttt and sent shrapnel into the back of my calf saturday

hurtttttt! we were wayy over 110 and all of a sudden i felt like i got shot:|err

sphss

turbo wog

· #19 · Jul 21, 2009

looks badass, you got a pic of the rear? is it innercooled?what brand carb?size 1250?

IMPATIENT 1

Discussion Starter · #20 · Jul 21, 2009

turbo wog said:
looks badass, you got a pic of the rear? is it innercooled?what brand carb?size 1250?

twin air to water ic's, there's more pics of it in forced induction , page 2 of my carb tuning thread

intake air temp makes the intake frost over, sturday was 100+ here and it still had frost forming on the intake during a pass

1 - 20 of 166 Posts

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