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  1. #1

    RXT Impeller Pitch

    Purchased a stock 2006 Seadoo RXT and have installed a RIVA S3 supercharger, 42 lb injectors, and a 4" kanaflex intake. Right now the seadoo has the stock prop, just wondering what I should expect the top speed to be as it is (won't be able to take it out for a few weeks), and what would the best impeller pitch to upgrade to? With the setup and a new impeller is 70 mph possible?


  2. #2
    captain slow Turbo Retro's Avatar
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    15/20 on prop pitch for stock rpm's. not sure about speed

  3. #3
    Quote Originally Posted by NickH View Post
    Purchased a stock 2006 Seadoo RXT and have installed a RIVA S3 supercharger, 42 lb injectors, and a 4" kanaflex intake. Right now the seadoo has the stock prop, just wondering what I should expect the top speed to be as it is (won't be able to take it out for a few weeks), and what would the best impeller pitch to upgrade to? With the setup and a new impeller is 70 mph possible?
    And here I thought I was the last one to install an S3.

    Right now with an oem prop....you'll be at 67-68 or so...but all over the limiter.

    For starters...with an oem IC you don't need 42's...stock is just fine. 4" in front is a help....but to really make it breath you need to go rear air. A 14/19 is gonna be my bet...considering you haven't listed any other mods...ie...freebs...hull...handling...exhaust. With a 14/19, 4" front air, S3SC on an other wise stock ski. You'll crack 70.

    I'm running...god it's been a while since I've done this...

    filled holes, flushed Riva grate, 2* wedge, skegs, 5" rear air, rad4 torq plate, free-flo exhaust, 160* thermo, block-ups, S3SC, 14/19+2

    Before the torq plate I was getting 72.7 @ 8050 since then my sc is slippin a bit so no new numbers till this summer.

    With the 42's you'll be rich...and if you put on a 15/20...it'll dog you....my bet....4-500rpm.

    Ask me how I know...heh.
    Last edited by VaRedneck; 04-26-2014 at 09:53 PM.

  4. #4
    Thanks for the advise guys. Leaning toward a 14/19, Everything else it stock, probably going to fill the ride plate holes. Do you think it will run to lean with an aftermarket intercooler?

  5. #5
    nope....you should be right on the money...(w/ 42's and an exic).....course...you add an exic...you might then wanna look at a 15/20 as well as a rrfr.

  6. #6
    Had my first run on the ski today, tons of power. Definitely needs a different pitch, when hitting the throttle from a stop, it would immediately jump to 8300 rpm and hold it there. I didn't want my egts to be too high so i kept the Rpms down to 8150 by only giving it about 3/4 throttle. At 3/4 throttle and 8150 rpm I GPS'd a speed of 66.5 mph. Water temp was about 50 degrees and air was about 55. I'm thinking about going with the 14/19, but water temp will never really get above 65 where I use it so I'm not sure if I'll have the power to spin the 15/20, any opinions?

  7. #7
    Was this fresh or salt?

    I'll stick with post #3.

  8. #8
    Quote Originally Posted by VaRedneck View Post
    Was this fresh or salt?

    I'll stick with post #3.
    14/19 it is! This was in freshwater

  9. #9
    rxp steve
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    IMO, I would get a 14/19 and a wedge at this point to add to the mods that you currently have. That should take you to about 68 mph. to take the T to 70 mph you'll have to go to the ext. intercooler and add 42's. the ext intercooler and 42's will really wake the S3 up. The wedge and 14/19 should put you right at the 8100 mark. When you add the intercooler and 42's you'll have to repitch the 14/19 to +1 or 2. If I had it to do again, I would go with the x charger and 42's and saved myself some money. My brother-in-law also has an 07 T that we went x charger and 42's without an ext cooler and we have the same top end. I can out pull him mid-range by about a ski. But if he was to add a cooler he would smoke me. IMO both setup's are bullet proof, but the x charger setup is cheaper for the same speed.

  10. #10
    Quote Originally Posted by rxp steve View Post
    IMO...to take the T to 70 mph you'll have to go to the ext. intercooler and add 42's. the ext intercooler and 42's will really wake the S3 up. The wedge and 14/19 should put you right at the 8100 mark. When you add the intercooler and 42's you'll have to repitch the 14/19 to +1 or 2...
    2*wedge, flushed Riva grate, bucket trimmed, skegs, block-up's, free-flo, rear air, S3SC, 14/19+2...oem ic, oem injectors...72.7 @8050

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