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  1. #1
    FZS-T
    Join Date
    May 2007
    Location
    South..South...Florida
    Posts
    757

    14/19r Vs 15/20r

    I need some guidedance i have an rxt with:

    X charger
    XS IC
    42 lbs
    Riva grate
    4" kanaflex
    RRfpr
    walbro 255

    i did back to back testing with 14/19r and 15/20R and

    and with the 14/19 Iím getting 8100 Rpms by the 15/20r Iím only turning 7700 and I definitely donít have a boost leak since Iím boosting 9-10 Psi

    what should i try different !....any input will be greatly appreciated speedwise 70.4 mph fastest on gps

    thanks,


  2. #2
    Gotta love this sport! 05Limited's Avatar
    Join Date
    Apr 2005
    Location
    Stockton, CA
    Posts
    2,677
    +1
    4
    The 15/20 with 2 mm taken out will put you close to 8100 and will be faster than the 14/19.

  3. #3
    Gotta love this sport! 05Limited's Avatar
    Join Date
    Apr 2005
    Location
    Stockton, CA
    Posts
    2,677
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    BTW, what were your water/air temps and altitude? Annette's ski just moments ago turned 70.8 with same set up minus external IC and extra fuel.

    Water 81, air 83, sea level. I'm de-pitching a 15/20 now.

    EDIT: Never mind, I just saw you were in FL.

  4. #4
    stl2slw's Avatar
    Join Date
    Mar 2008
    Location
    Hampton, VA
    Posts
    59
    what is the air temp/water temp/humidity? all could be a factor on why you aren't getting more rpms. i also think using the 15/20 would net more speed, if pitched accordingly

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