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supercharger boost formula

Discussion in 'General Discussion' started by flow=go, Oct 3, 2005.

  1. flow=go

    flow=go Guest

    does anybody know a formula to calculate boost for supercharger applications
     
  2. VS Omega

    VS Omega New Member

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  3. flow=go

    flow=go Guest

    thanks had already found couple of hp calculators but got myself an eaton m62 s/c and i want to calculate the boost I would achieve running s/c at max 14000rpm at 1l/rev n a 5lt engine so I can choose compression ratio for engine
     
  4. VT-565

    VT-565 New Member

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    are you meaning how much boost to make an approximate power level? or compressor maps?
     
  5. VT-565

    VT-565 New Member

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    wouldnt it be easier to go for a predetermined and safe static compression ratio then alter the pulley size of your supercharger?
     
  6. flow=go

    flow=go Guest

    i want to know an approx boost level at 5000 rpm so I can calculate a relative compression ratio on a 9.5-1 comp ratio and see if i woul consider this a reliable comp ratio for street car
     
  7. flow=go

    flow=go Guest

    it is a safe comp ratio im trying to find i need to know what size to make the drive pulley to achieve the boost level im after which in turn will tell me what sort of comp ratio to aim for when building motor
     
  8. VT-565

    VT-565 New Member

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    sounds like you need a compressor map relevant to your supercharger type and model. once you have that, you can see what it's adiabatic efficiency limit is and work on a safe margin below that. it's no use over spinning your blower with too small a pulley.
     
  9. flow=go

    flow=go Guest

    found boost calculator on sprintex website
     
  10. czerwonyVN

    czerwonyVN New Member

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  11. VT-565

    VT-565 New Member

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    what did you come up with?
     
  12. flow=go

    flow=go Guest

    308ci @ 5000rpm with eaton m62 S/c which flows 1lt/rev (it was free) will give me 4.3psi boost at 15000 rpm s/c speed ( which is just over max allowed s/c speed)
     
  13. VT-565

    VT-565 New Member

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    i don't mean to be critical, but if it is only delivering that much boost at it's maximum, wouldn't it be a bit of a waste of time? i mean, any boost is good boost, but to engineer a set up for only that much extra power?
     
  14. flow=go

    flow=go Guest

    should be good boost at say 10:1 comp motor
     
  15. flow=go

    flow=go Guest

    been thinking today about needing more boost got two small garrett turbos in shed begging for a home maybe a twin turbo supercharged v8 will give me the boost i desire bring on the plumbing nightmare
     
  16. VT-565

    VT-565 New Member

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    it has been done before, the only thing is adapting it to your situation. Have you got a rating on the turbos yet?
     

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