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  • Carputer question

    Looking at this thread,
    http://www.mp3car.com/vbulletin/work...m-v-2-0-a.html

    I ask, (not specifically that person, but this sparked my interest.) how do you power it? Most PC power supplies of course, take 120v... But possibly more significant, they're very large. What do you use?

    Thanks.

  • #2
    google for m2-atx / m4-atx should answer your question, i think ?
    http://www.slowriders.nl
    http://www.capricecustoms.nl

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    • #3
      Thanks, buddy!

      Comment


      • #4
        even better, check otu the power supply section in the store:
        http://store.mp3car.com/Power_Products_s/2.htm
        My OLD 2001 Mitsubishi Eclipse GT:
        "The Project That Never Ended, until it did"


        next project? subaru brz
        carpc undecided

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        • #5
          Thanks, gents.

          Question: Does the alternator vary it's Drawing load (i.e., takes away power from.. Can't believe I'm forgetting this! in essence, less goes to the wheel.) as demands increase, or does it always draw the same load and simply limits the output as the v.reg demands?

          The reason I ask is to see if a carputer would have any effect on the MPG or HP, and I don't completely understand alternators.

          Comment


          • #6
            in theory, every light you turn on takes away energy, so would affect your MPG ...
            But, in case of a normal carputer (not some extreme machine with more power than your engine has) you wouldn't really notice it ... (at least when you're using for example a m2-atx, when you have an alternator from 12 - 220 (or 110) and then a normal pc that takes it back to 5 and 12V, well that isn't really efficient offcourse..)
            http://www.slowriders.nl
            http://www.capricecustoms.nl

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            • #7
              So, the alternator gets that extra power by increasing tension on the belt, right?

              And thanks, again!

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              • #8
                wait.. by alternator i mean a sort of transformator, that transforms 12V to (in your case) 110V .. They are used to be able to put normal in-house machines in a car (for example your shaver). You could also put a PC or a gamecomputer on it. But i wouldn't recommend it.
                What you mean, is the 12V generator on your engine ? I think we are talking about other things ...
                have you looked up "m2-atx" to see what it is, and what it does? Maybe then you understand what I am trying to explain.
                http://www.slowriders.nl
                http://www.capricecustoms.nl

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                • #9
                  M2-ATX is basically an atx powersupply that uses the standard automotive 12v and makes it usable.

                  But that's not what I mean.. What I mean is, the alternator in the engine compartment that's ran by the serpentine belt... Does it always "create" the same amount of power, and some of it is goes to waste if the vehicle / battery cannot use it all.. Or, does it not waste and instead it increases/decreases tension on the serp belt for changes in required power, or does it use gears, etc.?

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                  • #10
                    Ok, in that case sorry, I misunderstood your question.
                    There are no gears in an alternator, and there also is no system that increases the tention on the belt or something like that, I'm sure about that. Normally, RPM of the engine determines how much energy is "created". the "car" takes what it needs, and the rest is used to charge the battery. If the car takes more than the alternator generates, the rest is taken from the battery. This is the theory.
                    But now, i do know that when you, for example, turn on your airconditioning, your car DOES use more fuel ... Now how that is possible? I'm not sure .. I gues that when the car demands a lot from the alternator, it produces more friction (right word?) in the alternator, so that the engine loses more power in making it turn round then it does when you are just driving, no airco, no lights, no radio etc.

                    But, why do you want to know this ??
                    http://www.slowriders.nl
                    http://www.capricecustoms.nl

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                    • #11
                      Because 130w has to be considerably higher than a stock stereo.. Granted, 12v @ 11a (132w) isn't all that much.. It's nice to know.

                      The A/C has a clutch and is attached to the serp belt, in most vehicles. I think only hybrids really use a fully electric A/C? .. Wouldn't that be the reason for the MPG lost there?

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                      • #12
                        Pfff... to be honest, now you're talking me under the table !
                        (very bad english translation, just to say that now you're telling me more then i know about this ..) I only know the basics, apparently ... Maybe someone else can help you with this ?
                        http://www.slowriders.nl
                        http://www.capricecustoms.nl

                        Comment


                        • #13
                          i think you are both starting to overthink this-- think of it this way-- a alternator is like pedaling a bicycle--you are always pedaling to keep going(ie; alt. is always creating voltage/current) but when you encounter a huge hill, you reallyneed to pedal to get up the hill(ie; alt works hard to overcome huge power draw).

                          so the alt is always there producing energy, but only produces what is needed to a point.

                          every electrical device you add to the car will increase fuel consumption slightly, but, realisticly, you probably won't notice it, and if you are that critical of your fuel economy(hypermiler?), you would have already taken out your door panels, and passenger seats to save gas.
                          in this case, even a standard radio is not for you(extra wheight and something else to power),
                          My OLD 2001 Mitsubishi Eclipse GT:
                          "The Project That Never Ended, until it did"


                          next project? subaru brz
                          carpc undecided

                          Comment


                          • #14
                            Sound.. The alt works harder, yes.. generates more heat, lowers life-span, etc...

                            But, doesn't it always draw the same energy away from the wheel? The volt-regulator simply limits the amount of energy that goes to the bushings (iirc.. may be completely off here.), thus - less is created.

                            Comment


                            • #15
                              The answers have mostly already been given throughout this thread but just to clarify a little bit...

                              I ask, (not specifically that person, but this sparked my interest.) how do you power it? Most PC power supplies of course, take 120v... But possibly more significant, they're very large. What do you use?
                              You can use either a DC/DC power supply like the M2 or M4 or others, or you can use a DC/AC inverter and a standard AC power supply but that will be less efficient and less convenient.

                              So, the alternator gets that extra power by increasing tension on the belt, right?
                              No, the belt tension does not change. The alternator supplies the current as demanded by the connected electronic devices and the magnetic torque increases as current increases, which is why more electronic devices can have a negative impact on fuel economy, though usually small.

                              But now, i do know that when you, for example, turn on your airconditioning, your car DOES use more fuel ... Now how that is possible?
                              The fuel economy lost from running the AC is due to the mechanical power required to run the compressor. When the AC is off, the compressor is disengaged from the engine drive, usually by a clutch.

                              Like soundman98 said, unless you are a hypermiler, it is probably not worth worrying about the fuel economy impact of running a carpc. A small form factor computer should use well under 100W most of the time, and there are many, many people running 5-600W RMS audio systems off of stock alternators.

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