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How can I calculate boost with impeller speed?

Discussion in 'Turbo Tech Questions' started by mtrain, Oct 5, 2012.

  1. mtrain

    Joined:
    Nov 27, 2004
    I've got some ATI Procharger cogged pulleys for sale, and everyone keeps asking me how much boost it will make.

    Well, for my engine 540fe Ford it would be X, but for a 302 cid, I don't have a clue.

    Here is what I did. I went to this site which calculates impeller speed, which calculated to be
    38117.65, with a 7.5 crank pulley, and a 4.25 supercharger pulley, shifted at 6k rpms. {again the shift rpm is just a guess as I don't know what rpm someone would shift their car}.

    So with all of that given, how does that translate into boost?

    Thanks.
     
    mtrain, Oct 5, 2012
    #1

  2. Mnlx

    Joined:
    Sep 20, 2009
    Probably not much help but, I have an old pc performance analyzer that allows changing of head units, pulley ratios, and cid, then it calculates boost.
     
    Mnlx, Oct 5, 2012
    #2

  3. wantabe

    Joined:
    Oct 12, 2010
    Alittle hard..
    The turbo and pro charger impellers are non positive displacement pumps
    So, the pumping chamber ( between the fins). Doesnt calculate out to a defined number.
     
    wantabe, Oct 5, 2012
    #3

  4. cat herder

    Joined:
    Jan 4, 2008
    Any chaos theory experts in the house? :hmm:
     
    cat herder, Oct 5, 2012
    #4

  5. mtrain

    Joined:
    Nov 27, 2004
    Does anyone have a link to a boost calculator based on pulley size?
     
    mtrain, Oct 5, 2012
    #5

  6. mtrain

    Joined:
    Nov 27, 2004
    mtrain, Oct 5, 2012
    #6
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