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Discussion Starter #1
Hey guys i just laid down 720 hp on the dyno with my 540 n/a im putting it in my 2000 25 daytona i have an xr drive 1.50 ratio what kind of mph should i except from this boat with the proper prop. Prob a 28 pitch
 

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What RPM did it make 720? If you can turn the 28" prop 6000 RPM I'd expect 93 - 95 MPH. 6500 RPM 100 - 103. Just a guess on the speed. Keep us posted!!

Oh and nice numbers on the 540.
 

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AKA Blownjet 468
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1,205 Posts
If my old combo in my 25 ft cat (worn out loose 502 w/ a whipple) could
go 96mph on gps at about 5400rpm with a labbed 32 Bravo one(also 1.50)
I would think you could break a 100 no problem with a little more prop,
but like it was said before, what rpm are you making the power at?
 

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Discussion Starter #4
6250 i had the same motor in it before with a diffrent crank and cam it was 640hp i had a1.36 drive with a 24 pitch and it hit a wall at 5200 rpm and woulonly do.84 on gps. I broke the crank in half so i did a complete rebuild and changed the gears to 1.50 i still gotta get a prop
 

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AKA Blownjet 468
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1,205 Posts
no prop expert, but I would try a 30p bravo 1, thats what I want to try
on mine:D oh, I forgot you said it was NA, I guess I just have blowers
on the brain.....
 

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Dos XX
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400 Posts
I have a 27' Daytona with 700HP blown 502 and I am running a labbed 32p and seeing 93mph on glass. Can't wait to try it with a little wind chop to lift the boat up a little more. I have been told I should be real close to 100mph if I can get 5400-5500 rpms out of her.

I have a Labbed 30p I am trying to unload if you want a 30p but I bet you end up with a 32p labbed since you are a smaller boat with more horsepower.
 

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6250 i had the same motor in it before with a diffrent crank and cam it was 640hp i had a1.36 drive with a 24 pitch and it hit a wall at 5200 rpm and woulonly do.84 on gps. I broke the crank in half so i did a complete rebuild and changed the gears to 1.50 i still gotta get a prop
I think typically its about 18hp for every mile an hour? So maybe a 4.5mph gain?
 

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AKA Blownjet 468
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1,205 Posts
I have a 27' Daytona with 700HP blown 502 and I am running a labbed 32p and seeing 93mph on glass. Can't wait to try it with a little wind chop to lift the boat up a little more. I have been told I should be real close to 100mph if I can get 5400-5500 rpms out of her.

I have a Labbed 30p I am trying to unload if you want a 30p but I bet you end up with a 32p labbed since you are a smaller boat with more horsepower.
what are you looking to get for the 30? already have a labbed 32, just want to try somthin' different,
 

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Frozen Hoser
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118 Posts
Hey guys i just laid down 720 hp on the dyno with my 540 n/a im putting it in my 2000 25 daytona i have an xr drive 1.50 ratio what kind of mph should i except from this boat with the proper prop. Prob a 28 pitch
My buddy's 25 with a whippled 500 (720) hp 1.5 bravo with a labbed 32 runs 96, 97 light.
My 25 with a roots blown 509 (900)hp 1.34 SCX/sc with a labbed 30 runs 114 @ 6000 light and 108 to 110 full of fuel.
 

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Frozen Hoser
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118 Posts
Hey guys i just laid down 720 hp on the dyno with my 540 n/a im putting it in my 2000 25 daytona i have an xr drive 1.50 ratio what kind of mph should i except from this boat with the proper prop. Prob a 28 pitch
My buddy's 25 with a whippled 500 (720) hp 1.5 bravo with a labbed 32 runs 96, 97 light.
My 25 with a roots blown 509 (900)hp 1.34 SCX/sc with a labbed 30 runs 114 @ 6000 light and 108 to 110 full of fuel.

I think the real question is at what rpm does your torque start fallin off? Thats gonna tell the true sotry as to what prop you can pull.

Mine and buddy's boats when stock 1.5 bravo/500efi would pull a 28 bravo to 5100rpm at 82/83mph.
 

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Discussion Starter #12
Yea that's the problem with n/a motors alot less tq. I made 685 at 5300 im hoping for mid 90's with at 28 pitch ill be happy there
 

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Havasu & Anaheim Hills
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361 Posts
912 hp at 6000 in a Daytona 27 with a 1.50 drive and 34 prop does 116 in cool air, about 105 in summer heat. Going to a 1.35 drive this off season and a 32 prop to see if we can get into the 120's.
 
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