29Fever01

Do you know what your x dimension is?

29Fever01

I'm not quick 600hp but I'm going to chime in here. Mine dynoed at 585 hp with a brand new xr drive. I live in the northeast and run fresh water. So far with a stock 28p left hand I have run a best of 78.4 at 5100 in good conditions, 2 people and light on fuel (132gallons full). My cruise at 3600rpm is around 50-53 mph and at 4000rpm 60-61mph. The slip numbers for this prop is really good, but I just can't quite spin it at WOT, I need to be around 5300rpm. I've tried a couple different recepies from bblades, but we are still trying to dial it in. I ran a best of 80mph at 5400rpm but the problem is the cruise. I loose almost 8mph at 3600 rpm. I realize I will have to give up a little at cruise to gain it on top but not 8mph! Any ideas? With 585 hp should I be able to run 81-82mph with 10% slip? It does run that percentage with the stock 28p. Everyone on here with 29s say they run low 80s with a 575sci engines.

lslavick

I have a 29 with a 548 pushing 635 at 5400 running an IMCO -1 shorty. I have seen 82 both with a labbed 4 blade 30 Bravo 1 at 5500 and labbed 5 blade 28 Maximus at 5200. I still think I could get closer to 85 if I spend more time tweaking both props.

dspad

Had the same happen to me on my 27 with 600 hp with a labbed 26 from b blades it's crazy but I can't brake 71 with a 24 p5x hydro at 5300 and 70 with a stock 26 at 5100. Brett worked with all summer couldn't make it work a labbed 26 put me at 46 at 4k with a stock 26 at 4k at 56 the hydro px5 made a huge improvement in ride and I Cruz at 52 at 4k so ya I was hoping to see 78 but nope disappointed had a few motor issues so have to see what happens this year

29Fever01

I would think if you had a true 600hp you would be running at least as well as I do. Also if you are still stock x dimension and bravo drive, I would think a 4 blade would be best for WOT speeds. You should be able to run an average of 15% slip at cruise with the right bravo1 4 blade.

dspad

Slip
With a bravo 1 24 4 blade at 4k 52 14% slip
Bravo 1 26 4 blade 4k 56 8 % slip

29Fever01

Was your engine run and tuned on a dyno when built? What is your target rpm at WOT? What was your slip at WOT? 1.5 gear ratio? I would think with a 600 hp would be spinning the hell out of a 26p bravo1. For instance my boat came with a stock 26p bravo 1 prop from fountain. With my stock 500efi I could spin it 5200-5350rpm depending on conditions at WOT.

dspad

It was put on the Dyno three pulls and left it the way it was based on horse power and air fuel ratio tried a 950 didn't make things better or worse

Target rpm 5800 never got there in the boat
Wot
24 bravo 5500 73 Slip 12
26 bravo 5100 70 Slip 16
Px5 hydro 5 blade 24 pitch 5300 71 Slip 14

Here is the problem i'm on the borderline what 600 when the motor goes in the boat and the exhaust is added I'm losing 75 hp 50 horse power from Dyno to mounting in the boat 25 horse power is being lost in the exhaust manifolds risers are dry wet at the tip

So I need to invest into a very good set of aluminum heads like dark pro ones and upgrade to a 1050 that combination along with the short tube headers should give me an additional 80 hp

DBleil89

I would try a 22p bravo 1. Get the rpms up and boat may run a bit faster. However Im curious if you have a 1.36 gear ratio.

That sounds like a lot of money to get back to your 600hp. Do you have any dyno sheets. Maybe the guy running the dyno didn't have a good correction factor so the number were inflated.