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  1. #1
    homebrew's Avatar
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    what impeller to get ?

    hello all -- i have a 2007 gtx limited with a riva stage one kit installed now normally i top at 7700 to 7800 rpms -- until today i capped at 8000 to 8040 rpms ( it was only 85 degrees and 45% humidity here on the coast of virginia instead of the standard 95 degree weather and 1000% humidity ) with two ppl on the ski -- i weight about 235 lb and the girl i won't ask -- but anyway i'm about to have jerry install a green wheel on to the supercharger with steel washers and ceramic bearings -- i have the solas concord 14/17R impeller right now -- what pitch impeller do i need to go to after the green wheel is installed ?--plus a side question since the riva stage 1 kit was installed when i go from a stand still (with 2 ppl on the ski )if there is any chop on the water i have trouble with cavitation -- any input would be great ! thanks


  2. #2
    Try adding a mm or two when you get that green wheel installed....see what that does, then you might get a 14/19.

  3. #3
    homebrew's Avatar
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    okay -- thanks

  4. #4
    2006 RXT dave262626's Avatar
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    Quote Originally Posted by homebrew View Post
    hello all -- i have a 2007 gtx limited with a riva stage one kit installed now normally i top at 7700 to 7800 rpms -- until today i capped at 8000 to 8040 rpms ( it was only 85 degrees and 45% humidity here on the coast of virginia instead of the standard 95 degree weather and 1000% humidity ) with two ppl on the ski -- i weight about 235 lb and the girl i won't ask -- but anyway i'm about to have jerry install a green wheel on to the supercharger with steel washers and ceramic bearings -- i have the solas concord 14/17R impeller right now -- what pitch impeller do i need to go to after the green wheel is installed ?--plus a side question since the riva stage 1 kit was installed when i go from a stand still (with 2 ppl on the ski )if there is any chop on the water i have trouble with cavitation -- any input would be great ! thanks
    Do you have trouble with cavitation from a stand still when you are alone & no chop or on smooth water?

  5. #5
    homebrew's Avatar
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    two ppl on the ski -- smooth water hardly never -- with a chop every time --the ski jumps out of the water with the bow very high then grabs and goes -- but i have to back off for a sec. due to cavitation

  6. #6
    homebrew's Avatar
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    so how much of a diffrence in lowering the rpms will a 14/19 impeller do from the 14/17R i'm using now ?

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