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Thread: Blower Sizing

  1. #26
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    3 out of 3 members liked this post. Yes Reputation No
    hello everybody!
    this is my first post here...i found this site searching information about supercharging my 530 M54B30
    i have in my hands an ASA TM-20 HD supercharger so i don't have to choose, but i need to know how to use it...
    here is the compressor map

    Click here to enlarge

    i also have headers and intercooler
    target boost is 10-11psi
    can anyone help me with math? i have 2 pulleys, one 165mm and the other 135mm

  2. #27
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    Click here to enlarge Originally Posted by stefm5 Click here to enlarge
    530 M54B30
    You want to talk to @PEI330Ci and @bluejeansonfire

    Also, consider making this same post in the S54/M54 section for more specific help pairing this with your motor.

  3. #28
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    thanks sticky Click here to enlarge
    i'll first wait for answers here..

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    Hello, thank you for supplying the compressor map. I will help you size it for your motor.

    You need to tell me a few things though, is the motor stock? Displacement 3 liters? Rev limit 6500? Where do you live, what type of ambient temps will you see?

    Answer those and I will get back to you with the right pulley sizes and whatnot.
    Some people live long, meaningful lives.

    Other people eat shit and die.

    I'm not racist, I hate everybody equally; especially fat people.


    Click here to enlarge

  5. #30
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    This is what I am getting for your motor.

    I assumed
    Ambient temperature 75F
    6500 RPM
    12 psi boost
    3 liter
    89% VE
    intercooler effectiveness 65%
    compressor efficiency 72%
    engine volumetric flow CFM 306.3
    engine volumetric flow SCFM 510.9
    engine mass flow: 0.63 lbm/s or 0.286 kg/s
    Thermal efficiency 32%

    Estimated power output @ crankshaft: 375.38 HP
    Estimated torque output @ crankshaft: 303.31 ft-lbs

    These are rough estimates, could be wrong depending on what I assume for a bunch of stuff. But should get you an idea of what is happening.

    As for pulley sizes, I need a better resolution picture of your compressor map it is too small and I cannot see the RPM bands and efficiency islands on it.

    Thanks




    EDIT:

    I tried zooming into your picture, if I am reading this right your blower needs to be spinning at about 65k RPM. I need to know the step up inside the blower to tell you what pulley to use to get your target boost.
    Some people live long, meaningful lives.

    Other people eat shit and die.

    I'm not racist, I hate everybody equally; especially fat people.


    Click here to enlarge

  6. #31
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    Click here to enlarge Originally Posted by DBFIU Click here to enlarge
    This is what I am getting for your motor.

    I assumed
    Ambient temperature 75F
    6500 RPM
    12 psi boost
    3 liter
    89% VE
    intercooler effectiveness 65%
    compressor efficiency 72%
    engine volumetric flow CFM 306.3
    engine volumetric flow SCFM 510.9
    engine mass flow: 0.63 lbm/s or 0.286 kg/s
    Thermal efficiency 32%

    Estimated power output @ crankshaft: 375.38 HP
    Estimated torque output @ crankshaft: 303.31 ft-lbs

    These are rough estimates, could be wrong depending on what I assume for a bunch of stuff. But should get you an idea of what is happening.

    As for pulley sizes, I need a better resolution picture of your compressor map it is too small and I cannot see the RPM bands and efficiency islands on it.

    Thanks




    EDIT:

    I tried zooming into your picture, if I am reading this right your blower needs to be spinning at about 65k RPM. I need to know the step up inside the blower to tell you what pulley to use to get your target boost.
    How great is this?

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    Click here to enlarge Originally Posted by DBFIU Click here to enlarge
    Hello, thank you for supplying the compressor map. I will help you size it for your motor.

    You need to tell me a few things though, is the motor stock? Displacement 3 liters? Rev limit 6500? Where do you live, what type of ambient temps will you see?

    Answer those and I will get back to you with the right pulley sizes and whatnot.
    man you are very helpful!

    motor displacement 3 liters, rev limiter 6700rpm, i live in athens greece, temperatures 5-20C winter, 20-35C summer

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    15:1 step up as you mentioned in PM.
    Company also calls out 2,000kg/hr max, which is like 0.55 kg/s. You are at about 0.3 kg/s so the blower can flow your motor. Also, a lot of people on the E46 forum seem to like this blower.

    Lets say you need 70k RPM from the blower.

    The input shaft will need 70k/15 = 4666 RPM.

    If the internal step up really is 15:1 then you will need a bigger blower pulley than a crank pulley, which is strange... Double check your internal step up.

    you said you had two pulleys, one 165mm and the other 135mm. Are those crank pulleys or blower pulleys that you have?

    ok I found this diagram at turbomex



    http://supercharger.de/htm/english/p...s/pulleys.html

    You apparently have 2 blower pulleys 135 and 165? The 165 should get you the boost target you want.
    Last edited by DBFIU; 01-25-2012 at 06:51 PM.
    Some people live long, meaningful lives.

    Other people eat shit and die.

    I'm not racist, I hate everybody equally; especially fat people.


    Click here to enlarge

  9. #34
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    yes the pulleys that i mentioned are blower pulleys
    did you see the efficiency islands?
    in your first analysis you assumed 72% efficiency but this blower is much more efficient
    what about low rpms boost?

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    1 out of 1 members liked this post. Yes Reputation No
    I noticed the efficiency is higher than 72%. This blower is a very good blower, it can hit a pressure ratio of 3 which is amazing.

    You told me your crank pulley was 135mm, correct? I think you should go with the 165mm pulley for the blower to underdrive the blower. If it already has the 15:1 step up build in, the 165mm blower and the 135mm crank will give you about 70k+ RPM which should be good for 12-13 psi about.
    Some people live long, meaningful lives.

    Other people eat shit and die.

    I'm not racist, I hate everybody equally; especially fat people.


    Click here to enlarge

  11. #36
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    Click here to enlarge Originally Posted by DBFIU Click here to enlarge
    I noticed the efficiency is higher than 72%. This blower is a very good blower, it can hit a pressure ratio of 3 which is amazing.

    You told me your crank pulley was 135mm, correct? I think you should go with the 165mm pulley for the blower to underdrive the blower. If it already has the 15:1 step up build in, the 165mm blower and the 135mm crank will give you about 70k+ RPM which should be good for 12-13 psi about.
    thanks a lot!

  12. #37
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    Another great thread thanks to the Midget F*cker. Click here to enlarge

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