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Thread: Impeller speed

  1. #1
    Senior SCH Member Brcuda's Avatar
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    Impeller speed

    Have any of you guys calculated your impeller speed? If so what pulleys are you running and the impeller speed? The link below will give you the calculator to figure it out.

    Thanks


    http://www.vortechsuperchargers.com/tech/impspeed.html
    393 stroker with YS-trim Vortech :-)

  2. #2
    Senior SCH Member Trey's Avatar
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    I'm running a 2.95" Blower Pulley and a 7" Crank Pulley 10 rib setup.

    At 5500 rpm the impeller is seeing 45,025rpm
    1998 GT
    S-Trim
    DSS Forged Short Block
    PIs
    Murillo Tuned
    347hp 354ft/lb

  3. #3
    Senior SCH Member Brcuda's Avatar
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    Do you shift at 5500 rpm and if you do, do you have any track times?
    393 stroker with YS-trim Vortech :-)

  4. #4
    Junior SCH Member Guilt Trip's Avatar
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    I'm maxing my A-Trim at 44992.68,with a 6.87 crank,and a 2.95 charger pulley,at 5600 rpm.Shifting is done well before that though,around 5200.

  5. #5
    Junior SCH Member
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    Originally posted by Guilt Trip
    I'm maxing my A-Trim at 44992.68,with a 6.87 crank,and a 2.95 charger pulley,at 5600 rpm.Shifting is done well before that though,around 5200.
    Guilt Trip-

    What kind of boost are you seeing at that 45k impeller speed and at what altitude? Is it on a stock long block?
    '91 GT (Original Owner)
    SC-trim w/ bypass, TFS Street intake, 65 mm FMS TB, 7" crank pulley, Morpheus pipe, 30# FMS injectors, 255 GSS340 Walbro, 3.55's, 1 5/8 shorties, Magnaflow catback


  6. #6
    SCH Member down's Avatar
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    40.570 at 5600. Anyone know what max and/or optimal impellar speed is on an S-Trim?

    J

  7. #7
    Senior SCH Member Brcuda's Avatar
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    Hmmm

    Max efficient impeller speed is 45,000 rpm and max impeller speed for a S-trim is 50,000 rpm.
    393 stroker with YS-trim Vortech :-)

  8. #8
    Junior SCH Member Guilt Trip's Avatar
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    Originally posted by 91GTFiveO
    Guilt Trip-

    What kind of boost are you seeing at that 45k impeller speed and at what altitude? Is it on a stock long block?
    Couldn't tell you.Don't have a boost guage yet.I will soon though.The motor is a stock 86 longblock,with about 40k on it.Boost should be around 10lbs considering how restrictive everything is.Toronto is pretty much sea-level I believe.

  9. #9
    Senior SCH Member Trey's Avatar
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    Originally posted by Brcuda
    Do you shift at 5500 rpm and if you do, do you have any track times?
    I have track times but they don't count cause of my traction issue I'm working on.;) :D

    I was seeing 12lb of boost at 4800 feet. It was about 60* out.
    1998 GT
    S-Trim
    DSS Forged Short Block
    PIs
    Murillo Tuned
    347hp 354ft/lb

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