382 Fastech w/600's
 

New to me, 1.50 XR's on Stellings boxes. Ran 80gps turning stock 30p Bravo ones @ 5,100. What Maximus should I start with? Looking for good cruise efficiency. Boat is equipped with gen & air.

Thanks

fixx
 

what diameter B!'s..27 x 15.5 would be best if they make them...if not labbed 28's x 15.5

Maximus propellers decrease rpm by 500-600 compareing stock castings of the same pitch in Bravo 1 and Maximus.

Therefore, a 30 Maximus will take you to aprox. 4600 rpm. Lab Finishing that same 30 pitch casting at 15.25" diameter and with the correct recipe will get you to 5000 rpm and provide the best cruise speeds.
Using a 28 pitch Maximus casting in stock form will drop your rpm to 4900-5000. Labbing that propeller casting correctly will bring you back to the 5300 rpm range offering great acceleration and a better cruise speed than the Bravo 1.

So, overall performance including throttle response the 28's. Incredible cruise and acceptable throttle response the 30's.

Because your slip is over 15%, you shouldn't lose any top speed either.

Let me know if you want to test any Maximus castings.

Brett

Are you willing to run a 5 blade?

I had a 382 with built 540's making 630hp. I could spin labbed 30P Bravo's to 5,500 but the best cruising props I had were 28P Maximus that were labbed AND 15 1/2 diameter. I could spin them 5,200 but they cruised 58 (GPS) at 3,500....slip was around 10-11% The 30P Bravos wouldn't hit 50 at 3,500.

I've since sold the boat but the current owner might be interested in selling them....I had about $3,400 in them but he's got to decide what he'll take for them.

Brett, I will be in touch!

T500hp, sent you a PM

Whoa whoa whoa, $hredder... you're back in the game??? Congrats! Is this the one Eddie had listed?

Watch the maximus props if you get sporty with the throttles or drive it hard. May reduce drive life from loading the drives harder. If you focus on just cruise and don't drive it hard you will see a big cruise # improvement

Shallow Minded, yes it's the one Eddie had listed. I popped for a leakdown & was very happy with the results. Now I have to get this one propped right! Find someone to buy my other boat!

BOATAHOLIC, I know the 5 blades can be hard on drives. I have purchased a spare XR as to minimise down time in the event of a drive failure.

Talked to the current owner, he should be contacting you.

I have a 382 as well with twin 575SC motors spinning labbed 28P bravo 1 at a 5300 RPM. Best GPS speed is 79 mph. My boat has bravo drives (No boxes) along with air and gen package, so it is heavy. Any recomendations?

15" to 15.25" diameter 5 blades run great on these hulls. We have set up many with custom Maximus props as well as OXP's from Turbo and Hydromotive P5X's. The Maximus seems to be the favorite.

No fear using 5 blade props on standard Bravo drives unless you are constantly drag racing out of the hole or fly the boat and returning to the waer bouncing off the rev limiters.

We have all 3 models for testing.

Brett

Word of caution although your experience is certainly more than mine.

I tried a set of 30P Maximus that had a diameter of 15 (maybe 15.125). During a run I encountered some 2-3 ft white-cap chop that was NOT enough to fly the boat however with wind crossing from port, the port prop kept loosing bite and reving 300-400 rpms while loosing a little speed. I turned around and went 180 degrees in the other direction and now the starboard exhibited the same condition. To me the blades were just a little too short in "rough" conditions where the hull never left the water.

2002 382, XR's w/o boxes. Heavy on gear/fuel and makes 630hp/700tq fully dressed on Precision Marine dyno.

Agreed, every boat is different. "X" dimentions make a big difference even in 1/4" increments. Bravo 1 propellers are advertised at 15.25" but are only that large in the 34 and 36 pitch castings. If a 15" B1 stays hooked up, a 15" Maximus surely should.
My findings have been 15.25" diameter Max's to be the favorite on most FasTech hulls.

Brett