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Thread: figuring estimated HP

  1. #1
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    figuring estimated HP

    here is a formula for figuring flywheel hp as an estimate based off duty cycle and size of injectors

    injector size x duty cycle / BSFC x # of cylinders

    example...

    72.98 x 1.15%=83.927
    83.927 / .65 = 129.118
    129.118 x 8 = 1032.94 fwhp

    fwhp x loss % - Fwhp = rwhp

    1033 x .20 %= 206.6

    1033- 206.6 = 826.4rwhp


    again this is all a generalize calculation of power and should only be taken for bench racing


    _________________________ numbers used are my injector size and my duty cycle____________________________
    2002 Lightning - GT headed 5.5Litre w/ Twin 7665s
    2002 Silverado - 427Lsx w/ Twin gt4202s
    2010 Silverado crewcab Z71 - 5.3litre w/ procharger
    2000 Wrangler - 5.3litre with some stance
    2014 Xsport- 3.5 Eco boost
    412 Motorsports

    it ain't that I'm too big to listen to the rumors, It's just that I'm too damn big to pay attention to 'em..That's the difference

  2. #2
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    its alot easier to go from
    trap speed and weight of veichle

    .00426 x 145 mph = 0.6177
    ( 0.6177 )3 = 0.235685
    ( 0.235685 ) x 4200 = 989.877 rwhp

    its very close to actual HP #'s

  3. #3
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    Quote Originally Posted by flaco View Post
    its alot easier to go from
    trap speed and weight of veichle

    .00426 x 145 mph = 0.6177
    ( 0.6177 )3 = 0.235685
    ( 0.235685 ) x 4200 = 989.877 rwhp

    its very close to actual HP #'s
    agreed but if you dont have track times or weight going off this works


    but if that is your actual number then a 200 shot isnt all thta you were spraying. saying you made almost 800rwhp NA...that wold be the worlds record
    2002 Lightning - GT headed 5.5Litre w/ Twin 7665s
    2002 Silverado - 427Lsx w/ Twin gt4202s
    2010 Silverado crewcab Z71 - 5.3litre w/ procharger
    2000 Wrangler - 5.3litre with some stance
    2014 Xsport- 3.5 Eco boost
    412 Motorsports

    it ain't that I'm too big to listen to the rumors, It's just that I'm too damn big to pay attention to 'em..That's the difference

  4. #4
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    Quote Originally Posted by Quik View Post
    agreed but if you dont have track times or weight going off this works


    but if that is your actual number then a 200 shot isnt all thta you were spraying. saying you made almost 800rwhp NA...that wold be the worlds record

    what if u did not have tunning sofware???

    it just may be, jealous????? haha

  5. #5
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    Quote Originally Posted by flaco View Post
    what if u did not have tunning sofware???

    it just may be, jealous????? haha
    im not jealous bud, never have been. but on different note for RPM to go same mph as you did they hit their 427 with 450 shot....motors are similar as well and vehicles are similar as well in weight....so let that as it is
    2002 Lightning - GT headed 5.5Litre w/ Twin 7665s
    2002 Silverado - 427Lsx w/ Twin gt4202s
    2010 Silverado crewcab Z71 - 5.3litre w/ procharger
    2000 Wrangler - 5.3litre with some stance
    2014 Xsport- 3.5 Eco boost
    412 Motorsports

    it ain't that I'm too big to listen to the rumors, It's just that I'm too damn big to pay attention to 'em..That's the difference

  6. #6
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    Quote Originally Posted by Quik View Post
    im not jealous bud, never have been. but on different note for RPM to go same mph as you did they hit their 427 with 450 shot....motors are similar as well and vehicles are similar as well in weight....so let that as it is
    they must be using a 3 speed with no lock up bro. and a 1.30's 60' means less mph as well with faster time..

    so as i see it you dont know much about what actually takes to achieve that, just watching the vids wont tell you much bro. so go sit back in your computer and keep on dreaming!!!!

  7. #7
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    Quote Originally Posted by flaco View Post
    they must be using a 3 speed with no lock up bro. and a 1.30's 60' means less mph as well with faster time..

    so as i see it you dont know much about what actually takes to achieve that, just watching the vids wont tell you much bro. so go sit back in your computer and keep on dreaming!!!!
    alright bud, youre the god. hows that sound? ill sit back and let you post up results of your truck. But if your truck did make almost 800rwhp thru a 80e you would have mother of all NA LS motors. Or the fact your spraying more then your are allowing ppl to know. either way i dont know what im talking about and ill sit on the couch.

    o and what am i dreaming of? sure isnt being the fastest or etc. no need to get defensive


    on another note. you said blacksheep sprays 300 to go 9.9s right? his 408 made low 500s NA and his truck is pretty light..... and your truck had dyno'd what low 500s as well NA before the recent cam swap....a 200 shot on top of that in a heavier truck isnt going to get same results.
    Last edited by George C; 12-11-2008 at 01:33 AM.
    2002 Lightning - GT headed 5.5Litre w/ Twin 7665s
    2002 Silverado - 427Lsx w/ Twin gt4202s
    2010 Silverado crewcab Z71 - 5.3litre w/ procharger
    2000 Wrangler - 5.3litre with some stance
    2014 Xsport- 3.5 Eco boost
    412 Motorsports

    it ain't that I'm too big to listen to the rumors, It's just that I'm too damn big to pay attention to 'em..That's the difference

  8. #8
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    Quote Originally Posted by Quik View Post
    alright bud, youre the god. hows that sound? ill sit back and let you post up results of your truck. But if your truck did make almost 800rwhp thru a 80e you would have mother of all NA LS motors. Or the fact your spraying more then your are allowing ppl to know. either way i dont know what im talking about and ill sit on the couch.

    o and what am i dreaming of? sure isnt being the fastest or etc. no need to get defensive


    on another note. you said blacksheep sprays 300 to go 9.9s right? his 408 made low 500s NA and his truck is pretty light..... and your truck had dyno'd what low 500s as well NA before the recent cam swap....a 200 shot on top of that in a heavier truck isnt going to get same results.

    you make me laugh, since you know everything LOL, the world needs people like you.

    keep on hating bro.. rock on.. do u really want me to detail everything i have done and how i did it to you, uhhhhh, no.. go find out for yourself keep on trying

  9. #9
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    Quote Originally Posted by flaco View Post
    you make me laugh, since you know everything LOL, the world needs people like you.

    keep on hating bro.. rock on.. do u really want me to detail everything i have done and how i did it to you, uhhhhh, no.. go find out for yourself keep on trying
    why so defensive? is it your nature?
    2002 Lightning - GT headed 5.5Litre w/ Twin 7665s
    2002 Silverado - 427Lsx w/ Twin gt4202s
    2010 Silverado crewcab Z71 - 5.3litre w/ procharger
    2000 Wrangler - 5.3litre with some stance
    2014 Xsport- 3.5 Eco boost
    412 Motorsports

    it ain't that I'm too big to listen to the rumors, It's just that I'm too damn big to pay attention to 'em..That's the difference

  10. #10
    ff_jeff Guest

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