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  1. #1

    chargers and boost #s

    Hey folks,

    I am in the research process prior to upgrading our rxts (o6 and 07). We are planning on having the superchargers upgraded, probably an equivalent to a stage 2 or stage 2+. We currently have a stage 1 minus the 2 degree pump wedge given the chop.

    My search was partially only paritaly successful. I was wondering what the boost numbers were for the different chargers at stock (8100) and performance (8500) rpms. A portion of this was listed in this intro post by Greenhulk but it did not have the boost #'s. Also is the X charger equivalent or is it more boost than the Riva stage 3?

    Thanks guys.


  2. #2
    I don't mean to steer you away from the topic at hand....but....what do you have against a wedge in the chop?

  3. #3
    Quote Originally Posted by VaRedneck View Post
    I don't mean to steer you away from the topic at hand....but....what do you have against a wedge in the chop?
    Well, without the wedge if the ski is not hooking up well because it is out of the water a bit, then with the wedge, raising the bow of the ski up gets more of the ski out of the water making it worse in the chop.

    I imagine that is why the wedge is not recommended with the pump extension kit.

  4. #4
    Water4fire's Avatar
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    Ok, Well lets just remember a couple things. Boost is not just the only factor in a SCer you are looking at.

    Stock 215 HP SCer is a 127mm wheel about 7lbs of boost (Stock boat)
    Stock 255X SCer's are 137mm wheels and 9.5 lbs of boost stock! (sTOCK BOAT)

    Stage III SCer is a 127mm wheel upgraded to a Riva and is about 9.5lbs of boost.

    X SCer's also have a Riva drop in replacement and I believe they are 12lbs. of boost.

    What you need to remember if a Wheel produces close to the same boost it doesn't mean it is better and for example I say Stage III compared to a X SCer. They produces dang near the same boost numbers, but the XSCer is better!! Why? Well because it is a 137mm wheel over a 127mm wheel. It is bigger and will flow more air.

    Now going to the Bigger SCer's I did not mention as you stated equivalent to a stage 2 or stage 2+.So if you go into the Rude 1, 2, and 3 you have a bunch more stuff and also ET 68-140, et extreme, and et Race.

    A bunch of SCers out there.

    I hope this helps a little.

  5. #5
    Water4fire's Avatar
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    Now ofcoarse I forgot to mention the
    1st Gen drop in Riva 7.5 ( throw in trash)
    Greenwheel is a 127mm drop in replacement at 9lbs of boost
    Rotax racing drop in wheel (Samething)
    Riva Gen II (Samething.)

    These's 3 wheels are dam near if not the same thing. 127mm wheels and 9.0lbs of boost.

    .

  6. #6
    This strictly seat of the pants and personal eyeball only here so...take it for what it's worth.

    I run faster than a stock rxt in the chop. Of course...to me....a wedge should only be used in conjunction with skegs.

  7. #7
    As for the sc boost #'s.....I've asked this before elsewhere.

    What additional parts requirements are needed to run bigger sc's in stock boats.....(in re to safe engine reliability)......?

  8. #8
    Thanks guys, helpful info. I overlooked the basic principal that boost does not always mean power, movement of air also dictates power as well so the larger charger may move this air more efficiently. I was thinking on going with the x-charger, 42# injectors, xs intercooler. I want to use the stock exhaust outlet but remove the sound baffle. of course i will have to change the prop from stage 1. for now i will keep the same ecu. as for the opas (training wheels) will like to keep them for the "stock look" but i may end up removing them.

  9. #9
    Water4fire's Avatar
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    Quote Originally Posted by comish71 View Post
    Thanks guys, helpful info. I overlooked the basic principal that boost does not always mean power, movement of air also dictates power as well so the larger charger may move this air more efficiently. I was thinking on going with the x-charger, 42# injectors, xs intercooler. I want to use the stock exhaust outlet but remove the sound baffle. of course i will have to change the prop from stage 1. for now i will keep the same ecu. as for the opas (training wheels) will like to keep them for the "stock look" but i may end up removing them.
    I really love the X SCer, but you can not get away with just 42's with it and a external IC. You need to get a Riseing rate fule pressure reg.

    http://www.4-tecperformance.com/inde...oducts_id=1052

    It is always a great idea to get a A/F ration gauge to be safe, but there are plenty of guys on the forum that can guide you with that set up.

    .

  10. #10
    Quote Originally Posted by Water4fire View Post
    I really love the X SCer, but you can not get away with just 42's with it and a external IC. You need to get a Riseing rate fule pressure reg.

    http://www.4-tecperformance.com/inde...oducts_id=1052

    It is always a great idea to get a A/F ration gauge to be safe, but there are plenty of guys on the forum that can guide you with that set up.

    .
    agreed. i actually have an 06rxp with riva s3. i have a rr fpr and and wideband o2 on it.
    i was trying to get around the whole wideband by using a setup that has been proven. so that was why i was looking at the x-charger and its injectors. even if i go with the stock computer will i still need to go with the wbo2?

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