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Thread: what prop?

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    Sigmarxt's Avatar
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    what prop?

    Guys hello i have a RXT 215 with X charger, air filter, poweshot and machined improvement of the airflow to the throttle body ( sorry for my explanations for this, my engilsh are not so good). During 75 fahrenheit (outside temp) i get around 8000-8050 rpm and 66 mph (sea water). The problem is that most of the time i use my ski at summer and at around 95-100 fahrenheit where i get 7700 rmp and 65mph (both with gps, speedo always shows 70mph) due to hot outside air. I was thinking of changing the prop in order to increase wholeshot and gain a couple of hundreds in rpm, would the srx-cd 13/18 do the job? Take into account that acceleration is what i care for cause top speed cant be obtained at all times due to rough water conditions


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    Hey mate, I think you might have an underlying problem somewhere. You should be on the limiter with an X-charger and stock prop.. 14/19 would be the right prop for you set up I would think, but you need to investigate to find why your rpms are so low.

  3. #3
    What year RXT? your r's could be okay....but your speed is definately down. Salty conditions too?...could be a whole bunch of dirty clogged stuff causing the loss in mph.

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    Sigmarxt's Avatar
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    Quote Originally Posted by monaroman76 View Post
    Hey mate, I think you might have an underlying problem somewhere. You should be on the limiter with an X-charger and stock prop.. 14/19 would be the right prop for you set up I would think, but you need to investigate to find why your rpms are so low.
    Hello, i cant think of anything really. My washers have around 50 hrs (metalic ones) but i believe it is the climate here in Greece. To give you a hint i am faster than an rxt-x 260 (2010) and have raced a couple of them... also salty water could cause the loss of rpm. Finally, at WOT due to choppy water i see my rpms balancing from 7400 to 8150.

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    Sigmarxt's Avatar
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    Quote Originally Posted by VaRedneck View Post
    What year RXT? your r's could be okay....but your speed is definately down. Salty conditions too?...could be a whole bunch of dirty clogged stuff causing the loss in mph.
    My ski is a 2007 , Salty conditions all the time plus at least choppy water

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    monaroman76's Avatar
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    Quote Originally Posted by Sigmarxt View Post
    Hello, i cant think of anything really. My washers have around 50 hrs (metalic ones) but i believe it is the climate here in Greece. To give you a hint i am faster than an rxt-x 260 (2010) and have raced a couple of them... also salty water could cause the loss of rpm. Finally, at WOT due to choppy water i see my rpms balancing from 7400 to 8150.
    Sea water will not affect your rpms, not significantly anyway. If your ski is only pulling 7700 rpms with x-charger and air intake, I don't care if it is 200 outside, you have a problem somewhere.

    If it is just a case that it is too choppy to determine max rpms, then that's a different story.

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    Sigmarxt's Avatar
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    Quote Originally Posted by monaroman76 View Post
    Sea water will not affect your rpms, not significantly anyway. If your ski is only pulling 7700 rpms with x-charger and air intake, I don't care if it is 200 outside, you have a problem somewhere.

    If it is just a case that it is too choppy to determine max rpms, then that's a different story.
    Well am i with you in your thinking but how do you explain that i get 8050 to 8100 during March or April when the weather is cooler and i drop to 7700 during July or August?

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    Quote Originally Posted by Sigmarxt View Post
    Well am i with you in your thinking but how do you explain that i get 8050 to 8100 during March or April when the weather is cooler and i drop to 7700 during July or August?
    That is no doubt due to heat fade, but I think you should be on the limiter regardless of weather conditions, or atleast on the limiter in the cooler months.
    If you were to take the X-charger off and the air intake, and put the stock parts on, you'd barely be turning 7300 rpms in the Summer. IMO, something isn't quite right.

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    Quote Originally Posted by monaroman76 View Post
    That is no doubt due to heat fade, but I think you should be on the limiter regardless of weather conditions, or atleast on the limiter in the cooler months.
    If you were to take the X-charger off and the air intake, and put the stock parts on, you'd barely be turning 7300 rpms in the Summer. IMO, something isn't quite right.
    You got a point there. I will look into it. Is there a posibility that the charger washers are slightly worn out so as to loose rpms? Or they have a more like "on-off" kind of work- they either run perfect or dont run at all (and brake).

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    Quote Originally Posted by Sigmarxt View Post
    You got a point there. I will look into it. Is there a posibility that the charger washers are slightly worn out so as to loose rpms? Or they have a more like "on-off" kind of work- they either run perfect or dont run at all (and brake).
    Absolutely, as your clutch components wear, the supercharger slip will fall causing a loss of performance. This could potentially be your problem.

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