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How do I calculate extra injector size?

Discussion in 'Turbo Tech Questions' started by rubbersdown, Apr 13, 2013.

  1. rubbersdown

    Joined:
    Oct 13, 2007
    I am building a turbo cbr954rr right now and am planning to add 4 extra injectors but I am not sure how to calculate their size.
    The bike stock is about 130rwhp and I am shooting for around 200rwhp, Stock injectors are around 270cc I believe. The plan at the moment is to keep the stock injectors and add 4 extras and use an 034 fuel controller. Just need to figure out what size extra injectors I need.
     
    rubbersdown, Apr 13, 2013
    #1

  2. xr8tt

    Joined:
    Feb 14, 2003
    you want to nearly double the power level ??
    Double up on the std injectors ??
     
    xr8tt, Apr 14, 2013
    #2

  3. Mnlx

    Joined:
    Sep 20, 2009
    There are online calculators that work well for this. You'd need to know fwhp goal, bsfc, and base fuel pressure. Calculate lb/hr, or cc needed for hp goal, subtract your current injectors, and divide the remainder by 4. Here is a link to a calculator. http://witchhunter.com/injectorcalc1.php


    Edit... I used 250 fwhp goal, .6 bsfc, 43.5 psi base, and 270cc stock injectors, and came up with 4 222cc injectors at 80% dc to reach your goal.
     
    Mnlx, Apr 14, 2013
    #3

  4. rubbersdown

    Joined:
    Oct 13, 2007
    Awesome, thanks guys. Thats just the info I was looking for.
     
    rubbersdown, Apr 14, 2013
    #4
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