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  1. #1
    lets race.... mikeFZR's Avatar
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    Thumbs up stage 1 fzr prop results

    Ski has the mods in my sig, rideplate is stock w/ spacers. Both days were great for testing.... 75* air, 75* water, and low humidity. My top speed in stock form was 68.6 on the gps. All speeds were recorded after the engine was thoroughly heat soaked and the bow trimmed 1 up. Elevation was 400ft above sea level.

    Stock Prop and pitch: the ski was on the rev limiter with the stock prop. Not too hard but there was a noticeable popping sound from the rev limiter kicking in and also I could see my rpms going down on the TT. Top speed was 69.8 and after that I only could get to 69.0 so it might have been a spike. The prop would cavitate slightly from a dead stop, about 2 spins before it hooked up. My buddy has a bone stock 2009 fzr which I would race and I had him by a solid ski length out of the hole and then I would pull away on top end ever so slightly. If I had to rate the stock prop on a scale of 1-10 (10 being perfect) I would give it a 6. Top speed really wasn't impressive with the limiter kicking me down but the acceleration was still very strong.

    Skat 13/23:
    Top speed was 71.3 today with consistent runs at 71. There is absolutely zero cavitation out of the hole. There might be SLIGHTLY too much leading edge but its pretty damn close to perfect. Rpms are down to 7420+/- 10 at WOT (with the engine nice and heat soaked) So by getting the rpms up to 7700 I can see hitting 73. I did a bunch of runs with both seats off and my rpms came up to 7520 +/- 10... that is a 100rpm increase So a little cooling goes a long way! When I raced my buddy today I had him by about the same off the line but on the top end I was much faster. If I had to rate the skat prop I would give it a 8. Very good top end and good take off.

    Conclusion: Skat 13/23 hands down wins. Take off has no cavitation and top end is way better. I did measure the skat and its a true 14/22. Once I get the skat dialed in to 13/21, it should be around 73

    Below are some pictures from the prop install and comparison of the stock and skat props. I used a 70'' breaker bar and the stock prop came off with little effort.

    Click image for larger version. 

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    Thanks to Jerry for tracking down the prop for me!!





    Last edited by mikeFZR; 09-18-2010 at 04:42 PM.


  2. #2
    305coco's Avatar
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    great results , like i said before the skat 13/23 is too steep for a stage one, get the prop de-pitched and your speed will go up

  3. #3

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    Quote Originally Posted by 305coco View Post
    great results , like i said before the skat 13/23 is too steep for a stage one, get the prop de-pitched and your speed will go up
    Check your 13/23 prop to see what tru pitch it realy is if it a tru 23 then repitch your prop to a 13/22 or put a 85 mm reduction nozzle it it' a tru 22 then go to a 21 pitch and you will go a lot faster, It's amazing how far off these props are from what the mfg call them. Tommy Jordan

  4. #4
    What is the difference between repitching the prop to get the correct rpm to using a different nozzle?

  5. #5
    lets race.... mikeFZR's Avatar
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    Calling impros tomorrow! But I'll probably have it repitched over the winter because I go back to school in two weeks. I'm thinking 13/22 or 13/21 because those are the two recomendations I have gotten so far and if ever degree of pitch is about equal to 100 rpms, then 2 degree depitch seems good.

  6. #6

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    Quote Originally Posted by sdman View Post
    What is the difference between repitching the prop to get the correct rpm to using a different nozzle?
    When you use a bigger nozzle the rpms' will go up, Then when the cooler weather returns your r's will be too high and you can install the smaller one to get the r's back down some. It's just one way of being able to control your rpm's as weather changes from hot to cool since these supercharges motors seem to vary a lot in rpm's from hot humid weather to nice cool less humid days. I have seen 300+ rpm swings from worst to best weather conditions, Tommy Jordan

  7. #7
    Taking money away from the Z06 Fund
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    Quote Originally Posted by mikeFZR View Post
    Calling impros tomorrow! But I'll probably have it repitched over the winter because I go back to school in two weeks. I'm thinking 13/22 or 13/21 because those are the two recomendations I have gotten so far and if ever degree of pitch is about equal to 100 rpms, then 2 degree depitch seems good.
    I saw a 350rpms gain in going from a 13/24 to a 13/23. The 13/24 was a true 24, not sure if what the true pitch is on my current 13/23, as it's straight out of the box from Skat. For your setup, I'd go with a 13/21 if you are only at 7400 at WOT.

  8. #8
    lets race.... mikeFZR's Avatar
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    Quote Originally Posted by poof100 View Post
    I saw a 350rpms gain in going from a 13/24 to a 13/23. The 13/24 was a true 24, not sure if what the true pitch is on my current 13/23, as it's straight out of the box from Skat. For your setup, I'd go with a 13/21 if you are only at 7400 at WOT.
    350rpms with just one degree That sounds like a lot... I bet the 13/23 was more like a 13/22. Regardless, what ski and what mods did you see that 350rpm increase?

  9. #9
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    Quote Originally Posted by mikeFZR View Post
    350rpms with just one degree That sounds like a lot... I bet the 13/23 was more like a 13/22. Regardless, what ski and what mods did you see that 350rpm increase?
    Yeah, I thought the results were better than expected. Same water conditions, same temps in testing, same nozzle ring etc. I'm on a SHO, Stage 1 mods, plus Riva IC, Jim's Modded stock plate, R2, Riva nozzle and C1 wheel. I'm still only at 7900rpms, even with the C1 wheel, so I have no clue what's going on with my prop and rpms It's starting to annoy me. And I'm running the 86mm ring to boot, so who knows.

    I have another prop at Skat right now, trying out a 14/21 or 22 from them once I get it back.

  10. #10
    lets race.... mikeFZR's Avatar
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    Quote Originally Posted by poof100 View Post
    Yeah, I thought the results were better than expected. Same water conditions, same temps in testing, same nozzle ring etc. I'm on a SHO, Stage 1 mods, plus Riva IC, Jim's Modded stock plate, R2, Riva nozzle and C1 wheel. I'm still only at 7900rpms, even with the C1 wheel, so I have no clue what's going on with my prop and rpms It's starting to annoy me. And I'm running the 86mm ring to boot, so who knows.

    I have another prop at Skat right now, trying out a 14/21 or 22 from them once I get it back.
    Well the R2 and IC probably are helping your rpms which is why you saw such a big swing by de-pitching 1 degree. Tommy Jordan (2fast4u) recomended a 13/20 skat with the R1 to me.... and he really knows his stuff

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