blower overdrive

Discussion in 'PSI Superchargers Tech Questions' started by secondwindracing, Sep 25, 2009.

  1. secondwindracing

    secondwindracing top alcohol

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    with a hi-helix retro what kind of over drive? 41 on the bottom and 25/26/27 on top?..Dave
     
    #1
    secondwindracing, Sep 25, 2009
  2. Mike Canter

    Mike Canter Top Dragster
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    41/25 = 64%
    41/26 = 57.7%
    41/27 = 51.9%
     
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    Mike Canter, Sep 25, 2009
  3. secondwindracing

    secondwindracing top alcohol

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    do you think 64% is to much..dave
     
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    secondwindracing, Sep 25, 2009
  4. AFC357

    AFC357 New Member

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    Depends on crank shaft rpm, need to look at rotor rpm. But thats PUSHING it! Been there, done it:eek:
     
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    AFC357, Sep 26, 2009
  5. eli

    eli Banned

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    #5
    eli, Sep 26, 2009
  6. jim phillips

    jim phillips ta/fc

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    i have spun mine as much as 60* over but 57.7* over is what i run all the time i couldnt tell much difference i didnt think you had to spin the newer blowers that had to make good boost
     
    #6
    jim phillips, Sep 26, 2009
  7. Blownalky

    Blownalky Top Sportsman

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    How about a 60* degree rotor. Where does it peter out? Same 57.7% or something else?
     
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    Blownalky, Sep 26, 2009
  8. Mike Canter

    Mike Canter Top Dragster
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    If I remember correctly the max RPM the rotors should turn are around 13000-14000 rpm. Given this you can use your max engine RPM and see what the blower RPM is.
     
    #8
    Mike Canter, Sep 26, 2009

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