wellcrafted

Have a 290 sc with 600 sci looking for prop suggestions x-dim is 2" higher than normal , have 15 x 28 5 blade turbo precsion
prop on boat now cant get past 78 mph with 1/2 tank 2 people in 1 ft chop

Single Screw 32

What RPM ? Is that how it was set up from the factory ?

wellcrafted

5050 - 5100 rev , this is how it was sset up at factory

MrBeam

Is it on the rev limiter? My 290/525 turns a 27" 5-blade hydro but will bump the rev limiter with 2 people at 79 or 80 mph in cool weather.

Kevin

Revelocity

Is this the 2006 or 2007 290 with the 600 sci that also had the generator and other cruising ammenities installed? If so, weight is always a factor.

wellcrafted

no rev limiter is at 5400 rpm cant hit it , also boat is 2008 with nothing but a couch and storage cabinet in it

MrBeam

With a 28" prop your boat should be all over the rev limiter. It could be that the engine is somehow in guardian mode and running at 90%. Before I added A/C mine would turn a 28" prop and run low 80's.

Kevin

Pat McPherson

Have you tried a 4 blade prop? If it will stay hooked up it will be faster than a 5 blade.
You may also what to try a Hydro P5 or P5X 5 blade vs. the Turbo. On my last boat, I ran the Turbo Fusion 4 vs a Bravo I 4 blade vs a Hydro P5X and the Bravo was fastest by 2mph; the Turbo and Hydro ran the same. My point is that the Turbo may not be the fastest prop.
One other thing to keep in mind is that a 600SCI makes exactly 600CSHP and a 525EFI makes about 540CSHP; so the 600 is not going to push the boat that much faster than a 525 will.

Pat McPherson

Did it come from the factory with the Turbo 5 blade?
I'd try a 27p Hydro P5 or P5X...

wellcrafted

ran a 4 blade bravo 15 x 29 stock hit 5000 rpm 76 gps , the precision turbo came from the factory , also tested 5 blade hydro 15 x 27( started as a 15 1/2 x 28 ) lab 2 hit 5000 rpm 76 gps , cant hit rev limiter with these three props for nothing , gonna try 4 blade 15 x 30 merc labbed this weekend