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  1. #1
    Mik72e's Avatar
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    SS vs FF results are in

    Guys did some back to back testing today at the ramp I ve been running the SS for about 20hrs now no issue to report Comp is 150 150 145 i my Lowell ported 1300 with Ross s 43 TBs.
    Its been bugging me to run the FF thinking ill go faster well results are in.

    Plate TBs Nozzle Exaust RPM Speed Water
    980 43 87 SS 7240 80.2 Salt
    980 43 85 SS 7210 80.4 Salt
    980 43 85 FF 7180 79.7 Salt
    980 43 87 FF 7220 78.7 Salt

    Lost about 20-30rpms with the FF. (pulled harder and was allot louder)

    By the end of the testing i had done a few passes so engine had hit heat soak will be going back out on Friday to re run the FF with the 85mm nozzle again i am sure it will crack the 80mph.
    Have to say tho the ski pulls so hard with the 43s FF and 87mm nozzle feels like a 14/20 in it Ross the 43s TB s have giving the ski so much more bottom and mid range punch still chasing the top end speed.(it will come)

    I do feel like that i am running out of pitch i am spining a 14/24 at the moment

    Guys what results have you found running the FF have you found it to be faster i know the SS will give you more rpms.

    Interesting anyway


    I feel that i am running out of pitch new Impeller is on its way


  2. #2
    james k's Avatar
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    Nice to see some testing like this Mik...I have an 07 Lowell ported 1300 with 85m nozzle,ff,and spinning a 14/25 at 7320 rpms but only 78.0-78.6 mph..Still working on plate and tabs...

  3. #3
    Mik72e's Avatar
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    Awesome rpms 7320 with a 14/25 nice work to be running a FF and 85 and pull those rpms boy do you have room to play with.

    May i ask who pitched your Impeller.

  4. #4
    james k's Avatar
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    Quote Originally Posted by Mik72e View Post
    Awesome rpms 7320 with a 14/25 nice work to be running a FF and 85 and pull those rpms boy do you have room to play with.

    May i ask who pitched your Impeller.
    I pitch it with the Watcon gauge myself and has worked perfectly..I have obtained the rpms desired from when non ported 13/21 then 13/22 but when i ported the ski i tried 14/24,13/25...I am stumped right now a few days ago i turned the 13/25 7260 rpms and had cavitation on hole shot and mid range so i pitched the leading edge to 14 hopeing to drop a few rpms but amazingly it went 7320 but stopped the cavitation...I will be going out tomorrow to see if the rpms might have been a tach issue but i made 8 or so pulls in this range...If it is turning the rpms shown i will not pitch anymore just wait for summer to see what happens and i am using a (1200 grate with no holes filled)...I know there is a better alternative then me pitching the prop but has worked well for me so far...BTW: (I only weigh 145 lbs)
    Last edited by james k; 03-12-2008 at 01:35 AM.

  5. #5
    African-American
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    have you tried the 800 grate ?

    because currently your running the 1200 grate, and the 800 should allow you to break 80.

  6. #6
    Hydrotherapy's Avatar
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    Quote Originally Posted by spaceman View Post
    have you tried the 800 grate ?

    because currently your running the 1200 grate, and the 800 should allow you to break 80.
    mike broke 80mph a while back, i think its just a back to back for ss and ff

    good results mike, i wont run the risk of ss i will keep an eye on you thou.

  7. #7
    Mik72e's Avatar
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    Correct Paul its back to back testing nothing to do in breaking 80mph it has been bugging me so decided to test it.

    Also have been running the SS for 20hrs or so no issues at all but running the FF is piece of mine.

    Going back out in the morning to re run the FF with 85mm nozzle again.

  8. #8
    THE PLATE MAN JIM'S PERFORMANCE's Avatar
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    awesome testing Mike.

  9. #9
    mtrager's Avatar
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    We tested ss 2 years ago.

    Plus 30 on the rpms. If top speed is all you want it is the fastest.

    If you had the same set up with a free flow next to you, the stock set up would come off in a hurry.

  10. #10
    Mike you are probably at the limits of your dyna fly speed wise. At least in my experience, the dyna goes to 80 then its done, no matter how i pitched it, or what nozzle i used. Taking it to the 26-27 degree range actually killed both speed and rpms for me.

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