1989 xp150 prop questions

[Cajun75]

Hello,
I have a 89' xp150 on a 89' cajun 19' tournament series bass boat, had a torque shift prop on it that went bad, the boat gps speed was 67 mph, I replaced the prop with a hustler 14?21 and now have a top speed of 46 mph and the prop acts like it slips bad as soon as the boat plains out, you can actually feel the load come off the engine and prop when it hits plain, any help or idea's to get back to the speed I was getting with the torque shift prop.

Thanks

 

[Texasmark]

2 questions: Was the torque shift ported, SS, high rake, cupped? The Turning Point Hustler is alum with thicker blades and that will cost you. The Turning Point Hustler is ported. If you were not running a ported prop you may be experiencing one malfunctioning. Malfunctioning ports allow air across the blades when you don't want it over them....like after the hole shot and when you are attempting to peg your speedometer. Air across the blades, decreases the density of the water and your prop slip jumps from something like 12-15 to something like 25-30 for a set of numbers. Crank that into the www.go-fast.com prop slip calculator and you can see what difference it makes between your theoretical speed and actual.

Quick check. Take the prop off and with some tape on the inside of the hole, fill the port holes with JB weld and finish smooth on the outside. After 24 hours, go run it. Come back with the results.

 

[Cajun75]

Alright I'll try that thanks, the torque shift is not ported so maybe that's the problem

 

[flyingscott]

The parts are available for your torque shift why not fix it or is it irreparable.. Also the torque shift does not need to be ported since it starts at such a low pitch. Here are the parts http://www.torqueshift.aeromarine.com/. Are you running a jackplate also I would get rubber plugs to fill the port holes on the hustler. You may need some porting for the holeshot so it will be trial and error.