A need for Speed

[CrazyJ83]

Noworries
I am not having any trouble with hole shot. But my boat was owned by some Dr that never used it as you can tell. I was not aware that the stock prop was a 3 blade. also I was planing on giving it a full tune up this off season but it look like I might be doing that a lil sooner( I can't believe I didn't think of that) I was checking the speed by the speedometer and the Perfect Pass.

I had my '02 20V at Tahoe (6,200 ft) and I noticed the hole shot was --- shot with the stock 13x13 prop. Once it got going though it was fine and would cruise right along. I don't know the WOT speed though unfortunately.

I'll venture you have other issues if you're not getting at least 4,000-4,200 RPM. What's your elevation? Regardless of the low hours you may want to do a full tune-up (plugs, cap, rotor) and run some Chevron Techroline (sp) injector cleaner through it.

BTW, how are you checking your speed? The speedometers can be off by a lot and you may want to try a GPS.

[aredub]

Noworries
I am not having any trouble with hole shot. But my boat was owned by some Dr that never used it as you can tell. I was not aware that the stock prop was a 3 blade. also I was planing on giving it a full tune up this off season but it look like I might be doing that a lil sooner( I can't believe I didn't think of that) I was checking the speed by the speedometer and the Perfect Pass.

I had that same boat and it come stock with a 4 blade. Top speed was 40-41ish(barely).

[noworries]

I paid attention this last time out and I'll do about 40-41 MPH at about 4,500 RPM at 2,000 ft elevation (2002 20V w/Merc 315 MPI engine 13x13 4-blade prop with 1:1 gearing).

My sense is that top speed is less affected by elevation than is the hole shot. I'd go looking for your missing RPMs. Is the throttle opening all the way?

[Timmy!]

We lose about 18% of the horsepower up here in Colorado so if the boat was propped/geared for lower altitudes it makes sense that it could lose some top-end if it weren't able to achieve it's max rpm. Normally you wouldn't lose speed just based on lack of horsepower since the prop is still turning at the same speed as well as the engine so it's moving the same amount of water per revolution at altitude as it is at sea level. Does that make sense? Sounds to me like he's not reaching the proper rpm and if that's the case the prop would be the issue (or it might need a tuneup too).