DigDeep

454 Magnum MPI
Vortec Power Package
Imco PowerFlow Exhaust with Stainless Risers
Corsa Exhaust

Is it possible to translate 2950 PSI dyno reading into effective horse power?

Dennis Moore

No, but depending upon gear ratio and rpm, that is probably a powerful engine.

DigDeep

Dennis, thanks for the response. The gear ratio is stock 1.5:1. I'm swinging a 23" Mirage Plus on a 23' 2000 SeaRay 230 bowrider. I took the boat out this weekend to leeward side of Catalina Island, CA since having the work done. I max'd out at 59mph (GPS) at 4700rpm with about 46 gallons of gas and another 300lbs in people/gear. The ECM was recalibrated to 5400 WOT so I need to go out and make some more runs before having the prop lab finished. I have a 24" Bravo I demo prop to also try out, but think the 23" Mirage Plus is probably about right with correct trim and load. I'm looking for top-end speed as the boat's great in low end and mid-range. Comments or suggestions welcomed.

Dennis Moore

You are cranking out some power! Not many 23 foot boats like the Sea Ray will swing a 23 pitch prop. Have fun, wish I could come along!
Dennis Moore

DigDeep

It's somewhat of a "sleeper." It seems to "sneak" up on people and it really turns some heads when I when I hit the Captain's Call.

Selecting the correct propeller has me perplexed though:

Mirage Plus vs. Bravo I?

23" Mirage Plus or 21" Mirage Plus?

I've been told that I'll get best top-end with the Mirage Plus, but that the Bravo I might give me better stern lift and good results (although I'm not sure how that would help with top-end speed).

If I stick with my either my 23" or 21" Mirage Plus props, I guess it will be a function of which one I can push to 5300rpm...