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Thread: Turbos PSI VS. CFM

  1. 05-31-2006, 07:10 AM #1
    Nemesis
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    Default Turbos PSI VS. CFM

    I had this argument with someone last night over AIM, and I just thought id post this here as well....

    turbo's dont "put out" PSI. They flow CFM. PSI is a measurement of a characteristic of air. There's this facination with psi and most completely disregard CFM. 15psi on what?.....a T2 or a T78. One wouldn't do jack for your motor while the other would jack it up and have you cleaning up chunks of metal.

    www.howstuffworks.com

    they have a turbo section.

    Go read it.
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  2. 05-31-2006, 07:20 AM #2
    Halfwit
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    ummm, ok.
    And miles to go before I sleep,
    And miles to go before I sleep.
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  3. 05-31-2006, 07:22 AM #3
    Nemesis
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    Quote Originally Posted by Halfwit
    ummm, ok.

    ^ It flew over your head didnt it.
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  4. 05-31-2006, 07:22 AM #4
    Halfwit
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    i want to seea race between a cfm car and a psi car..

    itll be pizzimp
    And miles to go before I sleep,
    And miles to go before I sleep.
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  5. 05-31-2006, 07:24 AM #5
    Nemesis
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    Quote Originally Posted by Halfwit
    i want to seea race between a cfm car and a psi car..

    itll be pizzimp


    .....hmmm
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  6. 05-31-2006, 10:21 AM #6
    Jaimecbr900
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    In reality, this is actually a good informative post. Many people don't understand "flow" and "volume" but always want more PSI....

    This is where efficiency ranges and tuning make a big difference.

    Great post George.

    Mahdavi Motorsports SELOC Valvoline team ECI Flynn's

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  7. 05-31-2006, 11:10 AM #7
    trythefly
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    good post.

    CFM or cubic feet per minute is the most common unit I deal with on a daily basis designing HVAC systems.

    Most people have no fucking clue what CFM's are.
    Last edited by CaLviN; 05-31-2006 at 11:25 AM.
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  8. 05-31-2006, 11:24 AM #8
    Jaimecbr900
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    ^^^I don't think it's as much that people don't know what CFM is, but more like they don't know how it affects power output.

    Like George mentioned, if you take a BIG turbo @ 10 psi and compare it to a little tiny stock turbo @ 10 psi, they very rarely put out the same power. Why? Lots of reasons, but first is probably the amount of air one moves vs the other. Both may be at 10 psi, but the bigger turbo flows more air (volume wise) and therefore usually has the potential for more power overall. Also the efficiency range is quite different. A big turbo @ 10 psi may not even be breaking a sweat, whereas a tiny turbo could be close to being maxed out @ 10 psi and is really pumping nothing but hot air.

    Please don't flame me on the numbers as they are stricly hypothetical.

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  9. 05-31-2006, 01:16 PM #9
    Nemesis
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    Thanks Jamie LOL


    Im glad some liked my post
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  10. 05-31-2006, 01:19 PM #10
    Big Baller
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    George I dont post tech stuff on this board for a reason.

    The reason

    PEOPLE DONT FUCKING GET IT
    Quote Originally Posted by Slowwrx
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  11. 05-31-2006, 01:34 PM #11
    Speedm0(\)key
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    Quote Originally Posted by Jaimecbr900
    ^^^I don't think it's as much that people don't know what CFM is, but more like they don't know how it affects power output.

    Like George mentioned, if you take a BIG turbo @ 10 psi and compare it to a little tiny stock turbo @ 10 psi, they very rarely put out the same power. Why? Lots of reasons, but first is probably the amount of air one moves vs the other. Both may be at 10 psi, but the bigger turbo flows more air (volume wise) and therefore usually has the potential for more power overall. Also the efficiency range is quite different. A big turbo @ 10 psi may not even be breaking a sweat, whereas a tiny turbo could be close to being maxed out @ 10 psi and is really pumping nothing but hot air.

    Please don't flame me on the numbers as they are stricly hypothetical.

    well.. you said what i was about to say.. bastard! lol

    anyway.. jaime is pretty much right

    good post George.. you should try posting stuff like ethis out of the whoreslounge though.. for more views and responses.
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  12. 05-31-2006, 02:09 PM #12
    Jaimecbr900
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    Quote Originally Posted by Speedm0(\)key
    well.. you said what i was about to say.. bastard! lol
    They say great minds do think alike.......you ho!

    anyway.. jaime is pretty much right
    "Pretty much"????? I tried to keep it very simple like to start off with you techy bastage......

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  13. 05-31-2006, 02:12 PM #13
    1439/2000
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    The people on IA that this applies to already know it. The people that don't know it, will continue to put t70 ebay turbos on there b16s and make 4 pounds of boost.
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  14. 05-31-2006, 03:09 PM #14
    Speedm0(\)key
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    Quote Originally Posted by 1439/2000
    The people on IA that this applies to already know it. The people that don't know it, will continue to put t70 ebay turbos on there b16s and make 4 pounds of boost.

    EL OH EL
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  15. 05-31-2006, 03:09 PM #15
    Speedm0(\)key
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    Quote Originally Posted by Jaimecbr900
    They say great minds do think alike.......you ho!



    "Pretty much"????? I tried to keep it very simple like to start off with you techy bastage......

    lol bastage lol.
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